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2 DRAFT IN WIDE CIRCULATION Document Despatch Advice REFERENCE DATE ETD 13/ T TECHNICAL COMMITTEE: ET 13 ADDRESSED TO: 1. All Members of Equipment for Electrical Energy Measurement and Load Control Sectional Committee, ET 13; 2. All Members of Electrotechnical Division Council; and 3. All other Interested. Dear Sir(s), Please find enclosed a copy of the following draft Indian Standard: Doc No. ETD 13(5878) Title: Alternating Current Direct- Connected Static Prepayment Meters for Active Energy (Class 1 & 2) Specification Kindly examine the draft standard and forward your views stating any difficulties which you are likely to experience in your business or profession, if these are finally adopted as Indian Standard. Comments, if any, may please be made in the format given overleaf and mailed to the undersigned. Last date for comments: Thanking you, Yours faithfully (P. K. Mukherjee) Sc F & Head (Electrotechnical) Encl: As above Deleted: current Deleted: Prepayment : Font: Times New Roman, 12 pt, Not Bold, Complex, Bold : Font: Times New Roman, 12 pt, Not Bold, Complex, Bold Deleted: Electricity w : Left, Indent: Before: 0", After: 0" : Font: Times New Roman, 12 pt, Not Bold, Complex, Bold Deleted: att-hour meters for active energy : Font: Times New Roman, 12 pt, Not Bold, Complex, Bold Deleted: Class : Font: Times New Roman, 12 pt, Not Bold, Complex, Bold : Font: Times New Roman, 12 pt, Not Bold, Complex, Bold 2

3 Sl. No. Name of the Organization Clause/ Sub-clause Paragraph/ Figure/Table Date Document No ET 13(5878) Type of Comment Comments Proposed Change (General/ Technical/ Editorial 3

4 FOREWORD : Header, Left (Formal clause will be added later) The National Electricity Policy, 2005, published by the Central Electricity Authority, encourages introduction of prepayment meters for better revenue management. Consequently, it was felt by the BIS Sectional Committee ETD 13 that there is a need to formulate a standard for prepayment meters. The prepayment meter which this stand refers, conforms to the basic requirements laid down by the existing IS (Under harmonization). Prepayment meters are used in situations where the supply of electrical energy to the load my be interrupted or its restoration enabled under the control of the prepayment meter in relation to a payment tariff agreed between the customer and the supplier. The prepayment meter is part of a system that uses tokens to pass payment information between a vending network and the prepayment meters that include the meter accounting process. The functions of a payment meter are to measure electrical energy consumed and to decrement the available credit register in accordance with the metered consumption, and possibly fixed amount on daily basis for fixed charge calculation. This available credit register is incremented as the result of payments made to the electricity supplier, and the meter accounting process continuously calculates the balance of available credit ed by the customer. When the available credit register has been decremented to a predetermined value that is related to the payment mode in use, a switch is used to interrupt the supply to the customer s load. However, additional features may be present in the payment meter, which prevent or delay the opening of the switch, or limit further consumption to a low load level. Such social features may include the provision of an emergency credit facility, the possibility of operation in a fixed-payment mode, and the inhibiting of interruptions for certain times of day or night. Features to permit disconnection of supply on detection of tamper or fraud may be supported. In return for the payment and depending on the particulars type of system, the customer may be issued with a single-use token for the equivalent value, or a reusable token carrier may be credited with that value, or the token may be transmitted directly to the meter via a communications network (a so-called virtual token). One-way and two-way data transfer systems may be used, and the tokens may be: physical device such as smart cards, or other electronic devices, or magnetic cards; virtual tokens transferred by as remote communications system; or numeric tokens where sequences of digits are entered via keypad on the meter. Comment [p1]: This section may be omitted as it shall trigger a debate, some of the members may argue that the standard should be formulated only when the IEC standard is released Deleted: Since the IEC standard for prepayment IEC is in a draft stage and is expected to be published only in January 2006, it was felt that a national standard be brought in as soon as possible. This document may later be aligned to the IEC standard after due consideration by the committee. Till such time the standards on Electricity Metering Equipment (AC) General and particular requirements for various categories of meters are harmonized with the corresponding IEC standards, this document shall be used as the national standard for prepayment meters. : Font: Times New Roman, Complex Script Font: 12 pt, Not Bold : Font: Times New Roman, Complex Script Font: 12 pt, Not Bold : Font: Times New Roman, Not Bold, Complex Script Font: 12 pt For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test shall be rounded off in accordance with IS 2 : 1960 Rules for rounding off numerical values (revised). The number of significant ~places retained in the rounded off value should be the same as that of the specified value in this standard.

5 Deleted: An overview of various prepayment systems is available in Annex BUREAU OF INDIAN STANDARDS DRAFT FOR COMMENTS ONLY Doc: ET 13(5878) (Not to be reproduced without the permission of BIS or used as a STANDARD) Draft Indian Standard ALTERNATING CURRENT DIRECT- CONNECTED STATIC PREPAYMENT METERS FOR ACTIVE ENERGY (CLASS 1 & 2) SPECIFICATION Last date for receipt of comments is SCOPE This standard applies to direct connected static watt-hour prepayment meters of accuracy classes 1 and 2, for the measurement of alternating current electrical active energy of 50 Hz for single phase and three phase balance & unbalanced loads; which can control a load switch(es) for the purpose of interruption or restoration of the electricity supply to a consumer terminal. The load switch is controlled in accordance with the current value of the available credit in the prepayment meter. The load switch shall be available in the meter enclosure. It applies to their type, acceptance and routine tests. It applies to indoor applications only. It does not apply to: a) Watt-hour meters where the voltage across the connection terminals exceeds 600 V (line-to-line voltage for meters of polyphase systems); b) Watt-hour meters for outdoor applications. c) Meters with an external switch d) Meters for load control applications e) Multi part payment meter installation The long-term reliability aspect is not covered in this standard, as there are no short-term test procedures available, which would fit into type test documents to satisfactorily check this requirement. This standard does not cover the software requirement for prepayment meters. Deleted: : Font: Times New Roman, 12 pt, Complex Script Font: 12 pt, Highlight Deleted: An electricity prepayment system is used in a situation where the supply of electrical energy may be interrupted or restored by the electricity pre payment in relation to a payment tariff agreed between the customer and the supplier. The prepayment meter is part of a system that uses tokens to pass information between a vending network and the prepayment electricity meter. The pre payment electricity meter has an account register that may be credited by means of token issued by electricity supplier against payment received. Debit to the register takes place by dynamic application of tariff on the meter. Such tariffs may include electricity... [1] Deleted: For all tests, which are not specified in this standard, reference... must [2]... [3] Deleted: ALTERNATING CURRENT STATIC WATT-HOUR... [4] Deleted: [5]... [6]... [7]... [8]... [9] Deleted: This Standard applies only to newly manufactured static... [10]... [11] : Left, Indent: Before: 0" : Bullets and Numbering : Bullets and Numbering : Left, Indent: Before: 0" Deleted: This standard covers type, acceptance and routine test approval... [13] Deleted: An operational overview of various... [14]... [15] Deleted:... [12] 1

6 Deleted: 2. 2 REFERENCES The following normative documents contain provisions which, through reference in this text, constitute provisions of this Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. IS No. 1401:1970 Accessibility test probes (first revision) 2701(Pt ):1993 IEC 60-1:1989 High voltage test techniques Part 1 General definitions and test requirements 4905:1968 Methods for random sampling 11731(Pt1):1986 Methods of tests for determination of flammability of solid electrical insulating materials when exposed to an igniting source Part 1 Horizontal specimen method 13779:1999 ac Static watt-hour meters class 1and 2-Specification 12032:1987 Graphical symbols for diagrams in the field of electro-technology 12346:1999 Testing equipment for ac electrical energy meters 12360:1988 Voltage bands for electrical installations including preferred voltages and frequency 13010:2002 ac Watt-hour meters,class 0.5,1and 2 - Specification 3 DEFINITIONS 2 Title For the purpose of this standard, the following definitions apply. 3.1 General Definitions All definitions of IS 13779: 1999 apply. 3.2 Definitions Related to Functional Elements All definitions of IS 13779: 1999 apply. 3.3 Definitions of Mechanical Elements All definitions of IS 13779: 1999 apply. 3.4 Definitions Related to Insulations All definitions of IS 13779: 1999 apply. 3.5 Definitions Related to Meter Quantities Deleted: The following standards... [19] : Bullets and Numbering Deleted: 2.1 Comment [KKG2]: LIST to be... [31] Deleted: 38: 1983, IEC standard... [32]... [33] Table... [34]... [35] Deleted: Deleted: 3.0 Deleted: Deleted: Deleted: For Deleted: International S... [38] Deleted: 3.1 : Bullets and Numbering Deleted: Deleted: Deleted: Watthour Meter (Active... [47]... [48] Deleted: Deleted: Static Watt Hour Meter... [49]... [50] Deleted: Deleted: a) Deleted: Similar metrological Deleted: [16]... [17]... [18]... [20]... [21]... [22]... [23]... [24]... [25]... [26]... [27]... [28]... [29]... [30]... [36]... [37]... [39]... [40]... [41]... [42]... [43]... [44]... [45]... [46] Deleted: Deleted: Multi-Rate Meter... [51]... [52]... [53]... [54]... [55]... [56]... [57]... [58]... [59]

7 All definitions of IS 13779: 1999 apply. 3.6 Definitions of Influence Quantities All definitions of IS 13779: 1999 apply. 3.7 Definitions of Tests All definitions of IS 13779: 1999 apply. 3.8 Definitions of General Payment Metering Terms Available Credit value Value of available credit (In monetary or energy units) usable for further consumption that is either stored in the payment meter or calculated by it when ever required Fault Current Current flowing at a given point of network resulting from a fault at another point of this network Load Interface Terminal(s) where the customer s load circuit is connected to the payment meter where applicable Multi-part Installation Payment metering installation where the functional elements comprising the measuring element(s); register(s), storage, and control; meter accounting process; user interface including any physical token carrier interface; any virtual token carrier interface; load switch(es); auxiliaries; plus supply interface and load interface are not arranged in the form of a payment meter, but instead are partitioned into two or more units that require appropriate mounting, connection, and commissioning Payment Meter Electricity meter with additional functionality that can be operated and controlled to allow the flow of energy according to agreed payment modes NOTES 1 It includes the following functional elements: measuring element(s); register(s) storage, and control; meter accounting process and any time-based functions; user interface including any physical token carrier interface; any virtual token carrier interface; load switch(es);auxiliaries; plus supply interface and load interface. A payment meter takes the form of a single unit, or a min unit that also employs a single specified matching socket for the supply interface and load interface. In this case, some payment meter implementations may allow for some or all of any time-based functions to be provided by an external unit connected to the payment meter, such as a time switch, a ripple control receiver, or a radio receiver. : Left, No bullets or numbering : Font: Times New Roman, 12 pt, Bold, Complex : Bullets and Numbering : Bullets and Numbering : Bullets and Numbering Deleted: Add definitions from draft starting from and replace the section below : Font: Times New Roman, 12 pt, Complex Script Font: 12 pt, Highlight : Bullets and Numbering : Font: Times New Roman, 12 pt, Not Bold, Italic, Complex, Italic : Font: Times New Roman, 12 pt, Italic, Complex, Italic : Left : Font: Times New Roman, 12 pt, Italic, Complex, Bold, Italic : Bullets and Numbering : Left : Font: Times New Roman, 12 pt, Italic, Complex, Bold, Italic : Bullets and Numbering : Left : Bullets and Numbering : Left : Bullets and Numbering Deleted: 0 : Left 3

8 2 Refer to figure B1 for the generalized block diagram of a payment meter instance. 4

9 3.8.6 Payment Metering Installation Set of payment metering equipment installed and ready for use at a customer s premises. This includes mounting the equipment as appropriate, and where a multi-part installation is involved, the connection of each unit of equipment as appropriate. It also includes the connection of the supply network to the supply interface, the connection of the customer s load circuit to the load interface, and the commissioning of the equipment into an operational state as a payment metering installation Prepayment Mode Payment mode in which automatic interruption occurs when available credit is exhausted Supply Interface Terminal(s) where the supply network is connected to a payment meter, or to a specified matching socket, where applicable Emergency Credit Payment meter accounting function that deals with the dispensing of energy after available credit value becomes zero Time-based Credit Payment meter accounting functions that deal with the calculation and transacting of a (social) grant of credit that is released on a scheduled time base User Interface That part of a payment meter or payment metering installation that allows the customer to monitor and operate the installation. It may also facilitate meter reading and inspection, and metering services activities. Where physical token carriers are employed, it includes a token carrier interface. 3.9 Definitions of Tokens Token Equipment related definition Information content including an instruction issued on a token carrier by a vending or management system that is capable of subsequent transfer to and acceptance by a specific payment meter, or one of a group of meters, with appropriate security : Left : Left Deleted: Specified matching socket In relation to a payment meter arranged as a plug-in unit, a specified matching socket comprises a base with jaws to accept to the plug-in unit, terminals for connection of the supply network and the consumer load circuit, and appropriate secure fixing and sealing arrangements. The payment meter is capable of meeting the relevant typetesting requirements when it is a properly installed in any specified matching socket. : Font: Times New Roman, 12 pt, Bold, Italic, Complex, Bold, Italic, Highlight : Left : Left : Left : Left : Bullets and Numbering : No bullets or numbering : Indent: Before: 0", First line: 0", Outline numbered + Level: 3 + Numbering Style: 1, 2, 3, + Start at: 1 + Alignment: Left + Aligned at: 0" + Tab after: 0.5" + Indent at: 0.5" : No bullets or numbering 5

10 NOTE In a more general sense, the token refers to the instruction and information being transferred, while the token carrier refers to the physical device being used to carry the instruction and information, or to the communications medium in the case of a virtual token carrier. : Font: Times New Roman, 8 pt, Not Bold, Complex Script Font: 8 pt : Indent: Before: 0.5", No bullets or numbering : No bullets or numbering 6

11 System related definition Subset of data elements, containing an instruction and information, that is transferred to the payment meter by means of a token carrier Credit Token Token that represents an amount of credit in monetary or energy value for transfer from the vending point to the payment meter Duplicate Token Token that contains the same information as a token that has already been issued, and hence may also be a valid token. NOTE This is not same as replacement token. A duplicate token is a reissue of the same token that was previously issued and is identical to it in all aspects; where as replacement token is a newly generated token in place of a previously generated token and may not be identical to it in all aspects Multiple-use Token Token (such as a test token) that can be used for more than one successful session in a payment meter or possibly with each in a group of meters. These are typically used for meter reading or service purposes on repeated occasions No-Value Token Token that does not result in a financial advantage or disadvantage to the consumer, which may contain meter configuration data, or instructions to perform certain tests, or to display certain values on the user interface, or to retrieve certain data from the meter and return it on a token carrier Replacement Token A token that replaces a previously issued token in value. Physical token carries may require a blank token carrier to be configured for the customer s meters. NOTE A replacement token is a newly generated token in place of a previously generated token and may not be identical to it in all aspects: where as a duplicate token is a reissue of the same token that was previously issued and is identical to it in all aspects Single use Token Token (such as a credit token) that can only be used for one successful session in a payment meter Valid Token : Font: Times New Roman, 12 pt, Italic, Complex, Bold, Italic Deleted: in the APDU of the application layer of the POS to token Carrier interface and which is also transferred : No bullets or numbering Deleted: d : Font: Times New Roman, 8 pt, Not Bold, Complex Script Font: 8 pt : No bullets or numbering : Indent: Before: 0", First line: 0", Outline numbered + Level: 3 + Numbering Style: 1, 2, 3, + Start at: 1 + Alignment: Left + Aligned at: 0" + Tab after: 0.5" + Indent at: 0.5" : Font: Times New Roman, 12 pt, Not Bold, Complex : No bullets or numbering Deleted: d Deleted: 1 Deleted: t Deleted:... [63]... [64]... [65]... [66]... [67]... [68]... [69]... [70]... [71]... [72]... [73]... [74]... [75]... [76]... [77]... [78]... [79]... [80] 7

12 In relation to a specific payment meter(or group of payment meters), a token that is capable of being processed successfully by the meter(s) : No bullets or numbering 8

13 3.9.9 Value Token See credit token (3.9.2) 3.10 Definition of Token Carriers Token Carrier Equipment related definition Devices or media used to transport and present token information to payment meters, such as printed paper, magnetic care, electronic memory card/key, microprocessor card, or data communications networks. The token carrier may also carry ancillary control or monitoring information to or from the payment meter, depending upon system type and requirements System related definition Medium that is used in the physical layer of the POS (Point of Sale) to token Carrier Interface, onto which the token is modulated or encoded, and which server to carry the token from the point where it is generated to the remote payment meter, where it is received Bank Token Carrier Physical token carrier that has not been processed at the vending point or elsewhere and hence contains no specific data Disposable Token Carrier Token carrier that is not capable of further use once it has been accepted or used, such as a paper based magnetic card Machine-readable Token Carrier Physical or virtual token carrier carrying token information that is capable of being read and processed automatically on presentation to an appropriate payment meter, without further manual operation Example: A token employing a magnetic card as the token carrier Memory Token Carrier Physical token carrier containing a non-volatile memory device, in which the token is electronically encoded and stored while it is being transported. : Bullets and Numbering : No bullets or numbering : Font: Times New Roman, 12 pt, Not Bold, Italic, Complex, Bold, Italic : Indent: Before: 0", First line: 0", Outline numbered + Level: 3 + Numbering Style: 1, 2, 3, + Start at: 1 + Alignment: Left + Aligned at: 0" + Tab after: 0.5" + Indent at: 0.5" : Font: Times New Roman, 12 pt, Not Bold, Complex : Font: Times New Roman, 12 pt, Not Bold, Complex : No bullets or numbering : Font: Times New Roman, 12 pt, Italic, Complex, Bold, Italic : No bullets or numbering : Font: Times New Roman, 12 pt, Italic, Complex, Bold, Italic... [81]... [82]... [83]... [84]... [85]... [86]... [87]... [88]... [89]... [90]... [91]... [92]... [93]... [94]... [95]... [96] 9

14 Microprocessor Token Carrier Physical token carrier containing a microprocessor device with non-volatile memory, in which the token is electronically encoded and stored while it is being transported. In addition to the token information, the microprocessor token carrier may also contain an application programme and associated data Numeric Token Carrier Token transfer method where the token information can be represented in a secure manner by a visible and human readable sequence of numeric digits (typically 20 digits printed on a receipt) NOTE They may be entered into a payment meter via a keypad interface for evaluation and action One-Way Token Carrier Physical or virtual token carrier which is used for the transfer of credit and possibly tariff and configuration data in a single direction from the vending point or the management system to the payment meter Physical Token Carrier Token carrier that requires a human toe transport it at least part of the way between the point where the token is loaded onto the token carrier and the point where it is retrieved from the token carrier by the payment meter NOTE Examples of physical token carriers are: printed numbers; magnetic cards; printed bar codes; electronic storage in memory devices such as smart cards or memory keys; and audio messages dictated by interactive voice response equipment Rechargeable Token Carrier ( Refer ) Reusable Token Carrier Rechargeable token carrier physical token carrier that can be sued for multiple sessions for transportation of tokens Two Way Token Physical or virtual token carrier which is used for the transfer of credit and / or tariff and configuration data from the vending point or management system to the payment meter and response data from thee payment meter back to the vending point or management system for further processing, where response data may possibly return on a subsequent vending transaction. NOTE Response data may contain consumption information, tamper information, accountancy information and token status with or without time and date stamp. : Font: Times New Roman, 12 pt, Italic, Complex, Bold, Italic : Font: Times New Roman, 12 pt, Italic, Complex, Bold, Italic : Font: Times New Roman, 12 pt, Italic, Complex, Bold, Italic Deleted: programme : No bullets or numbering : Indent: Before: 0", First line: 0", Outline numbered + Level: 3 + Numbering Style: 1, 2, 3, + Start at: 1 + Alignment: Left + Aligned at: 0" + Tab after: 0.5" + Indent at: 0.5" : Left, No bullets or numbering : Indent: Before: 0.5", No bullets or numbering... [97]... [98]... [99]... [100]... [101]... [102]... [103]... [104]... [105]... [106]... [107]... [108]... [109]... [110]... [111]... [112]... [113]... [114]... [115]... [116]... [117]... [118]... [119]... [120]... [121] 10

15 Virtual Token Carrier Token carrier that does not require a human to transport it between the point where the token is loaded onto the token carrier and the point where it is retrieved from the token carrier by the payment meter NOTE Examples of virtual token carriers are modems on PLC, PSTN, GSM, GPRS and radio, LAN, WAN, direct local communication etc Definitions Relating to Tokens and Token Carriers Physical Token Carrier interface Complete interface protocol stack that includes any token carrier acceptor or keypad for a physical token carrier, the physical layer protocol and application layer protocol, plus any intermediate protocol layer Token Acceptance Recognition of the successful completion of the processing of any token that was presented to the payment meters. NOTE Typically, this might involve the addition of token credit to the meter s accounting register, cancellation of the token information from the token carrier so as to prevent subsequent acceptance by any meter, and a visible indication to the user on the user interface. Similarly, this may also be applicable to any tariff or configuration data included on the token carrier Token Cancellation 1) The process of erasing or invalidating information contained in a valid token upon its acceptance by a payment meter, to prevent its reuse. 2) Process of erasing or invalidating information contained in a token after it has been created, but before it is presented to a payment meter. This typically happens when the vending operator makes a mistake or if a technical problem occurs during the vending process Token Carrier Acceptor Physical part of a physical token carrier interface which mechanically accepts and holds the token carrier in the correct position for the token transfer process to take place between the token carrier and the payment meter. Examples are: Smart card acceptor; magnetic card acceptor; memory key acceptor Token Carrier Charging Loading of a token and tariff or configuration data onto a token carrier at a vending point or a management system Token Carrier Interface : No bullets or numbering Deleted: ; : Indent: Before: 0.5", No bullets or numbering Deleted: : Deleted: ; Deleted: and : Font: Times New Roman, 8 pt, Not Bold, Complex Script Font: 8 pt : Font: Times New Roman, 12 pt, Not Bold, Complex : No bullets or numbering : Bullets and Numbering : No bullets or numbering... [122]... [123]... [124]... [125]... [126]... [127]... [128]... [129]... [130]... [131]... [132]... [133]... [134]... [135]... [136]... [137]... [138]... [139]... [140]... [141]... [142]... [143]... [144]... [145]... [146]... [147] 11

16 Token carrier interface permits the manual or automatic entry of tokens into a payment meter. NOTES 1 For example, it may be a keypad for numeric tokes, or a physical token carrier acceptor, or a communications connection to a local or remote machine for a virtual token carrier interface. 2 The token carrier interface may also be used to pass additional information to or form the payment meter such as for the purposes of payment system management Token Credit Value of credit or energy to be transferred from the vending point to the payment meter in the form of a token on a token carrier Token Rejection This occurs when a token has been presented to but has not been accepted by a payment meter, and has not been erased or invalidated. In the case of a valid token not being accepted, the token may be presented and accepted at later time when conditions allow Token Replacement Token that replaces a previously issued token in value. Physical token carriers may require a blank token carrier to be configured for the customer s meter. NOTE A replacement token is a newly generated token in place of a previously generated token and may not be identical to it in all aspects; whereas a duplicate token is a reissue of the same token that was previously issued and is identical to it in all aspects Virtual Token Carrier Interface Complete interface protocol stack that includes the physical layer protocol and application layer protocol, plus any intermediate protocol layers Definitions Related to Load Switching Minimum Switching Current Smallest current that the payment meter is able to make, carry and break at the rated breaking voltage and under prescribed conditions Prospective Current Specified root-mean-square or peak value of current that would flow in a circuit if the unit under test were to be replaced with a conductor having negligible impedance. : Indent: Before: 0.5", No bullets or numbering : Indent: Before: 0.5", No bullets or numbering : Font: Times New Roman, 12 pt, Italic, Complex, Bold, Italic : Indent: Before: 0", First line: 0", Outline numbered + Level: 3 + Numbering Style: 1, 2, 3, + Start at: 1 + Alignment: Left + Aligned at: 0" + Tab after: 0.5" + Indent at: 0.5" : Font: Times New Roman, 12 pt, Italic, Complex, Bold, Italic : Indent: Before: 0", First line: 0", Outline numbered + Level: 3 + Numbering Style: 1, 2, 3, + Start at: 1 + Alignment: Left + Aligned at: 0" + Tab after: 0.5" + Indent at: 0.5" : No bullets or numbering... [148] : Indent: Before: 0.5", No bullets or numbering... [149]... [150]... [151]... [152]... [153]... [154] : No bullets or numbering : Bullets and Numbering : No bullets or numbering... [155]... [156] : No bullets or numbering... [157] : No bullets or numbering... [158] 12

17 Rated Breaking Current (Ic) Root-mean-square value of the current that the payment meter is able to make, carry continuously and break at the rated breaking voltage and under prescribed conditions Rated Breaking Voltage (Uc) Root-mean-square value of the supply voltage, as measured on the output terminals of the payment meter connected to the load circuit, at which the payment meter is able to break the rated breaking current Trip-Free Design Design which ensures that the moving contacts of the load switch return to and remain in the open position when the automatic opening operation is initiated after the initiation of the closing operation, even if the closing command is maintained. NOTE To ensure proper breaking of the current, which may have been established, it may be necessary that the contacts momentarily reach the closed position Utilization Category Performance criteria under which the load switching capability of a payment meter may be specified to suit the particular requirements of a payment metering installation. The main criteria being; minimum safety levels, Lightning surge withstand, fault current withstand and switch endurance.(see Section G) Definitions Related to Time Keeping and Tariff Control Crystal-Controlled Time Keeping Process of maintaining a payment meter s time by means of an internal crystal-controlled clock External Tariff Control Control of a payment meter s time-dependent or consumption-dependent tariff regime (timebased or consumption based charges and / or registers) by external signal(s) Internal Tariff Control Control of a payment meter s time-dependent or consumption dependent tariff regime (timebased or consumption based charges and / or registers) by signals from an internal real-time clock and switching programme. : No bullets or numbering : Indent: Before: 0", First line: 0", Outline numbered + Level: 3 + Numbering Style: 1, 2, 3, + Start at: 1 + Alignment: Left + Aligned at: 0" + Tab after: 0.5" + Indent at: 0.5" : No bullets or numbering : Indent: Before: 0", First line: 0", Outline numbered + Level: 3 + Numbering Style: 1, 2, 3, + Start at: 1 + Alignment: Left + Aligned at: 0" + Tab after: 0.5" + Indent at: 0.5" : Font: Times New Roman, 12 pt, Italic, Complex, Bold, Italic : Font: Times New Roman, 12 pt, Italic, Complex, Bold, Italic Deleted: root-man-square value of the opening operation is initiated after the Deleted: : Left, Indent: Before: 0.5", No bullets or numbering : Left, No bullets or numbering Deleted:,. Deleted: switching : Bullets and Numbering... [159]... [160]... [161]... [162]... [163]... [164]... [165]... [166]... [167]... [168]... [169]... [170]... [171]... [172]... [173] 13

18 Internal Time Keeping Maintenance of a payment meter s time by its own internal clock facility Operational Reserve Maximum period of time after switching off the power supply voltage, during which the payment meter is capable of maintaining correct time with a specified, relaxed timekeeping accuracy Reserve Restoration Time Period of time required for restoring the full operation reserve from the point where the operation reserve has been completely exhausted Time Indication Discrepancy Difference between the time displayed by the payment meter and the actual time. NOTE - The actual time may be obtained by using a reference clock Time Keeping Accuracy Increase or decrease inn the time indication discrepancy within a specified time interval Variation of Timekeeping Accuracy Due to an Influence Quantity Difference in timekeeping accuracy of a payment meter when only one influence quantity assumes successively two specified values, one of them being the reference value. 4 GENERAL REQUIREMENTS 4.1 Standard Electrical Values Standard Reference Voltage Standard reference voltages shall be 230 (400) V. Exceptional value of standard reference voltage can be 220 (380) V and 240 (415) V Standard Basic Current Standard basic currents shall be 5, 10, 15, 20, 30, 40 and 50A Deleted: : Bullets and Numbering Deleted: Deleted: nsulation: A s Deleted: <#>... [189] Deleted: i Deleted: nsulation: The Deleted: I Deleted: insulation applied to... live [190] parts Deleted: i Deleted: S Deleted: ingle insulation system... [191] Deleted: should Deleted: be one homogeneous... piece. [192] Deleted: Definitions of Deleted: m Deleted: eter Q Deleted: q Deleted: uantities... [194] Deleted: <#>V Deleted: <#>value of current in... [195]... [196] Deleted: i Deleted: nsulation: An Deleted: M Deleted: i Deleted: Independent insulation... applied [197] Deleted: i Deleted: nsulation: I Deleted: i... [174]... [175]... [176]... [177]... [178]... [179]... [180]... [181]... [182]... [183]... [184]... [185]... [186]... [187]... [188]... [193]... [198] Deleted: nsulation comprising... both [199] Deleted: <#>H Deleted: <#>highest value of... current [200] at Deleted: <#>. Deleted: <#>... [201] Deleted: <#>(Vb)... [202]... [203]... [204]

19 Maximum Current The maximum current shall preferably be an integral multiple of the basic current (For example six times the basic current) Standard Reference Frequency Standard value for reference frequency is 50 Hz. 4.2 Mechanical Requirements General Mechanical Requirements Meters shall be designed and constructed in such a way as to avoid introducing any danger in normal use and under normal conditions, so as to ensure especially: - Personal safety against electric shock; - Personal safety against effects of excessive temperature; - Protection against spread of fire; - Protection against penetration of solid objects, dust and water. All parts, which are subject to corrosion under normal working conditions, shall be protected effectively. Any protective coating shall not be liable to damage by ordinary handling nor damage due to exposure to air, under normal working conditions. NOTE For meters for special use in corrosive atmosphere, additional requirements shall be fixed in the purchase contract. The electrical connections shall be such as to prevent any opening of the circuit under normal conditions of use, as specified in the standard, including any overload conditions specified in this standard. The construction of the meter shall be such as to minimize the risks of short-circuiting of the insulation between live parts and accessible conducting parts due to accidental loosening or unscrewing of the wiring, screws, etc. The meter shall not be produce appreciable noise in use Case The meter shall have a case which can be sealed in such a way that the internal parts of the meter are accessible only after breaking the seal(s).the meter shall have a reasonably dust / moistureproof case, which shall be sealed by the manufacturer in such a way that the internal parts of the meter are accessible only after breaking such distinctive seal(s) Distinctive seal means a seal provided to ensure guarantee for quality of meter manufactured in accordance with this standard for a specified period the distinctiveness is ensured by embossing / engraving / punching on a seal, alphanumeric characters in a style to be declared by the manufacturer. A meter before installation may have other seals like security seal(s) provided by a user to ensure security of its measuring / registering elements. Deleted: Deleted: Deleted: for direct connected meters Deleted: e.g. Deleted: The maximum current shall not exceed 80A. Deleted:, : Indent: First line: 0" : Font: Times New Roman, 12 pt, Italic, Complex, Bold, Italic : Font: Times New Roman, 12 pt, Italic, Complex, Bold, Italic : Font: Times New Roman, 12 pt, Italic, Complex, Bold, Italic : Font: Times New Roman, 8 pt, Not Bold, Complex Script Font: 8 pt, English U.S. : Justified, Indent: Before: 0.5", Line spacing: single : Font: Times New Roman, 8 pt, Not Bold, Complex Script Font: 8 pt, English U.S. : Justified, Line spacing: single : Font: Times New Roman, Not Bold, Complex Script Font: 12 pt : Normal : Font: Times New Roman, Not Bold, Complex Script Font: 12 pt : Font: Times New Roman, 8 pt, Not Bold, Complex Script Font: 8 pt : Font: Times New Roman, Not Bold, Complex Script Font: 12 pt : Font: Times New Roman, 8 pt, Not Bold, Complex Script Font: 8 pt : Font: Times New Roman, Not Bold, Complex Script Font: 12 pt Deleted: : Normal... [208]... [209]... [210] 15

20 The cover shall not be removable without the use of a tool. The case shall be so constructed and arranged that any non-permanent deformation cannot prevent the satisfactory operation of the meter. The components shall be reliably fastened and secured against loosening. The holding on and sealing screws shall be held captive in the meter cover. Unless otherwise specified, meters having a case wholly or partially made of metal, shall be provided with a protective earth terminal Window If the cover is not transparent, one or more windows shall be provided for reading the display and observation of the operation indicator, if fitted. These windows shall be of transparent material, which cannot be removed, undamaged without breaking the seal(s) Terminals - Terminal Block(s) - Protective Earth Terminal Terminals may be grouped in (a) terminal block(s) having adequate insulating properties and mechanical strength. In order to satisfy such requirements when choosing insulating materials for the terminal block(s), adequate testing of materials shall be taken into account. The material of which the terminal block is made shall be capable of passing the tests given in ISO 75-2 for a temperature of 135 C and a pressure of 1.8 MPa (method A). The holes in the insulating material which form an extension of the terminal holes shall be of sufficient size to also accommodate the insulation of the conductors. For testing see The conductors where terminated to the terminals shall ensure adequate and durable contact such that there is no risk of loosening or undue heating. Screw connections transmitting contact force and screw fixings which may be loosened and tightened several times during the life of the meter shall screw into a metal nut. All parts of each terminal shall be such that the risk of corrosion resulting from contact with any other metal part is minimized. Electrical connections shall be so designed that contact pressure is not transmitted through insulating material. For current circuits, the voltage is considered to be the same as for the related voltage circuit. Terminals with different potentials which are grouped close together shall be protected against accidental short-circuiting. Protection may be obtained by insulating barriers. Terminals of one current circuit are considered to be at the same potential. Two Screws shall be provided in each current terminal for effectively clamping the external leads or thimbles. Alternatively, if an elastic pressure plate or similar effective device is provided to keep the entire length of the conductor within the terminal well pressed, one screw may be used. Each clamping screw shall engage a minimum of three threads in the terminal. The ends of screws shall be such as not to pierce and cut the conductors used. : Font: Times New Roman, Not Bold, Complex Script Font: 12 pt : Font: Times New Roman, Not Bold, Complex Script Font: 12 pt : Font: Times New Roman, Not Bold, Complex Script Font: 12 pt : Font: Times New Roman, Not Bold, Complex Script Font: 12 pt : Font: Times New Roman, Not Bold, Complex Script Font: 12 pt Deleted: The meter shall have a case, which can be sealed in such a way that the internal parts of the meter are accessible only after breaking the seal(s) and removing the cover. The cover shall not be removed without the use of a tool. The case shall be so constructed and arranged that any non-permanent deformation cannot prevent the satisfactory operation of the meter. Unless otherwise specified, meters intended to be connected to a supply mains where the voltage under reference conditions exceeds 40 V to earth, and whose case is wholly or partially made of metal shall be provided with a protective earth terminal. : Font: Times New Roman, Not Bold, Complex Script Font: 12 pt : Normal : Font: Times New Roman, Not Bold, Complex Script Font: 12 pt : Font: Times New Roman, Not Bold, Complex Script Font: 12 pt : Font: Times New Roman, Not Bold, Complex Script Font: 12 pt : Font: Times New Roman, Not Bold, Complex Script Font: 12 pt : Font: Times New Roman, Not Bold, Complex Script Font: 12 pt : Normal 16

21 The internal diameter of terminal hole shall be as specified in Table 1. Table 1 Terminal Holes (Clause 4.2.4) Sl No. Rated maximum Minimum Internal Diameter mm) current (A) (1) (2) (3) i) < ii) 40 < I < iii) 60< I < The terminals, the conductor fixing screws, or the external or internal conductors shall not be liable to come into contact with terminal covers (if made of metals). The protective earth terminal, if any: a. Shall be electrically bonded to the accessible metal parts; b. Should, if possible, form part of the meter base; c. Should preferably be located adjacent to its terminal block; d. Shall accommodate a conductor having a cross-section at least equivalent to the main current conductors but with a lower limit of 6 mm 2 and an upper limit of 16 mm 2 (these dimensions apply only when copper conductors are used); e. Shall be clearly identified by the graphical symbol: Protective earth (ground); and f. After installation, it shall not be possible to loosen the protective earth terminal without the use of a tool Terminal Cover(s) The terminal of a meter, if grouped in a terminal block and if not protected by any other means, shall have a separate cover which can be sealed independently of the meter cover. The terminal cover shall enclose the actual terminals, the conductor fixing screws and unless otherwise specified, a suitable length of external conductors and their insulation. When it covers a suitable length of external conductor, it is called an extended terminal cover and is used when the meter wiring is carried out from rear of the mounting board. Terminal covers without this provision and meant for meter wiring from front of mounting board are called as short terminal covers. The fixing screws used on the terminal cover for fixing and sealing in either short terminal cover or extended terminal cover shall be held captive in the terminal cover. : Font: Times New Roman, 12 pt, Not Bold, Complex : Centered Deleted: Deleted: 8 : Normal Deleted: Terminals may be grouped... [238] in... [239]... [240]... [241]... [242] : Normal... [211]... [212]... [213]... [214]... [215]... [216]... [217]... [218]... [219]... [220]... [221]... [222]... [223]... [224]... [225]... [226]... [227]... [228]... [229]... [230]... [231]... [232]... [233]... [234]... [235]... [236]... [237]... [243]... [244]... [245] 17

22 When the meter is mounted on the meter board, no access to the terminals shall be possible without breaking seals(s) of the terminal cover Clearance and creepage distances The clearance and creepage distances between a) Any terminal of a circuit with a reference voltage over 40 V; and b) Earth, together with terminals of auxiliary circuits with reference voltages below or equal to 40 V shall not be less than that stated in Table 2a for meters of protective class I and Table 2b for meters of protective class II. The clearance and creepage distances between terminals of circuits with reference voltages over 40 V shall not be less than that stated in Table 2a. Clearance of minimum 3 mm shall be provided between incoming and outgoing terminals of the same phase. Clearance of minimum 2 mm shall be provided between pressure terminal and current terminals of the same phase. The clearance between the terminal cover, if made of metal, and the upper surface of the screws when screwed down to the maximum applicable conductor fitted shall be not less than the relevant values indicated in Tables 2a and 2b. Table 2a Clearances and Creepage Distances (For Insulating Encased Meter of Protective Class I) (Clause 4.2.6) Sl.No. Voltage Phase to Rated Minimum Clearances Minimum Creepage Earth Derived Impulse Distance from System Voltage (V) Indoor Out Door Indoor Voltage (V) Meter (mm) Meter Meter Out Door Meter (mm) (mm) (mm) (1) (2) (3) (4) (5) (6) (7) I Not exceeding ii Not exceeding iii Not exceeding iv Not exceeding Table 2b Clearances and Creepage Distances (For insulating encased meter of protective class II) (Clause 4.2.6) Deleted: The terminals of a meter, if grouped in a terminal block and if not protected by any other means, shall have a separate cover, which can be sealed independently of the meter cover. The terminal cover shall enclose the actual terminals, the conductor fixing screws... [246] : Normal, Justified : Normal, Justified : Normal, Centered... [247]... [248]... [249]... [250]... [251]... [252]... [253]... [254]... [255]... [256]... [257]... [258]... [259]... [260]... [261]... [262]... [263]... [264]... [265]... [266]... [267]... [268]... [269]... [270]... [271]... [272]... [273]... [274]... [275]... [276]... [277]... [278]... [279]... [280]... [281] 18

23 Sl.No Voltage Phase to Rated Minimum Clearances Minimum Creepage Earth Derived Impulse Distance from System Voltage (V) Indoor Out Door Indoor Out Door Voltage (V) Meter (mm) Meter (mm) Meter (mm) Meter (mm) (1) (2) (3) (4) (5) (6) (7) i Not exceeding ii Not exceeding iii Not exceeding iv Not exceeding The requirement of the impulse voltage test shall also be met (see ). For the purpose of these requirements, metallic objects of the same size and shape as the token carrier are inserted into the token carrier acceptor. This metallic token shall be considered to represent an auxiliary circuit with a reference voltage below or equal to 40 V Insulating Encased Meter of Protective Class II A meter of protective class II shall have a durable and substantially continuous enclosure made wholly of insulating material, including the terminal cover, which envelopes all metal parts, with the exception of small parts, for example, name-plate, screws, suspensions and rivets. If such small parts are accessible by the standard test finger (as specified in IS1401: 1970) from outside the case, then they shall be additionally isolated from live parts by supplementary insulation against failure of basic insulation or loosening of live parts. The insulating properties of lacquer, enamel, ordinary paper, cotton, oxide film on metal parts, adhesive film and sealing compound, or similar unsure materials, shall not be regarded as sufficient for supplementary insulation. For the terminal block and terminal cover of such a meter, reinforced insulation is sufficient Resistance to Heat and Fire The terminal block, the terminal cover, the insulating material retaining the main contacts in position and the meter case shall ensure reasonable safety against the spread of fire. They should not be ignited by thermic overload of live parts in contact with them. The material of the terminal block should not deflect under heating. To comply therewith they must fulfill the tests as specified in of this standard. Deleted: T Deleted: ). : Font: Times New Roman, 12 pt, Bold, Complex, Italic Deleted: 6 Deleted: Where metallic token carriers are inserted Deleted: The clearance and creepage distances of the terminal block and those between the terminals and the surrounding parts of the case, if metallic, shall not be less than the values specified in table 4. The clearance between the terminal cover, if made of metal, and the upper surface of the screws when screwed down to the maximum applicable conductor fitted shall be not less than the relevant values indicated in table 4. Table 4 - Clearances and creepage distances for the terminal block Voltage phase- to Earth derived from rated system voltage. V... [282] : Font: Times New Roman, Not Bold, Complex Script Font: 12 pt : Normal : Font: Times New Roman, Not Bold, Font color: Auto, Complex : Font: Times New Roman, Not Bold, Complex Script Font: 12 pt : Font: Times New Roman, Not Bold, Complex Script Font: 12 pt : Normal Deleted: A meter having a durable and substantially continuos enclosure made wholly of insulating material, including the terminal cover, which envelopes all metal parts, with the exception of small parts, for example, name plates, screws, suspensions, and rivets. If such small parts accessible by the standard test fingers from out side the case, than they shall be additionally isolated from the live parts by supplementary insulation against failure of basic insulation or loosening of live [parts. The insulating properties of laquer, enamel, ordinary paper, cotton, oxide film on metal parts, adhesive film and sealing compound, or similar... unsure [283] : Font: Times New Roman, 12 pt, Bold, Italic, Complex 19