Alternating Current Power
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1 Chapter 4 Alternating Current Power MElec-Ch4-1
2 Overview What is Alternating Current AC Hazards AC Power Requirements Shoreside Utility System On-Board Generators MElec-Ch4-2
3 What is Alternating Current General Description Basic Terminology MElec-Ch4-3
4 General Description Batteries provide limited amount of power Can t run air conditioner or heater DC appliances are expensive Therefore need for AC on boat From shore power From on-board generator Need Service Drop Not an extension cord Safety hazards with AC power MElec-Ch4-4
5 Basic Terminology Polarity Hot, neutral and ground Voltage 120 VAC Frequency 60 Hz Resistance DC opposition to current flow Reactance AC opposition to current flow Voltage Drop difference input & output Wave Form Commercial AC is sine wave MElec-Ch4-5
6 Sine Wave Plot of AC Voltage is Sine Wave MElec-Ch4-6
7 AC Hazards Shock Fire Reversed Polarity MElec-Ch4-7
8 Shock and Fire Shock AC shock could be lethal Marine environment increases this hazard Need GFCI protection Fire Inadequate wiring and overloaded cables Over fusing or no overload protection Heater on extension cord MElec-Ch4-8
9 Reverse Polarity Reverse Polarity is extremely dangerous - Neutral is Hot (120 VAC not 0 VAC) - Produces stray current CIRCUIT REVERSED POLARITY 120V HOT BREAKER 2-WIRE OUTLET LOAD NEUTRAL GROUND 120V POTENTIAL NO SAFETY GROUND EXISTS BETWEEN CONNECTION BOAT NEUTRAL AND WATER Outlet checker indicates if AC outlet is correctly wired MElec-Ch4-9
10 Reverse Polarity - 2 Receptacles are polarized Plug can only be inserted one way Modern receptacles are polarized & grounded Narrow vertical slot is Hot (120 VAC) Longer vertical slot is Neutral (0 VAC) Rounded hole is Ground ABYC requires a Polarity Indicator Normally lights on AC power panel If reverse polarity light is On DO NOT USE SHORE POWER Immediately disconnect the shore power cable MElec-Ch4-10
11 AC Power Requirements Maximum Current Limitations Priority Usage Table MElec-Ch4-11
12 Maximum Current Limitations Dockside Outlet Service Cord Boat s Service Entrance MElec-Ch4-12
13 Dockside Outlet 30A outlet protected by 30A circuit breaker 15 A outlet protected by 15A circuit breaker If 15A to 30A adapter plugged into 15A outlet and 30A cable plugged into adapter Current available limited to 15 Amps A 30A to 20A adapter permits a 15A cord to be plugged into dockside outlet NOT SAFE! No GFCI protection Outlet is overprotected MElec-Ch4-13
14 Service Cord 30A, 120 VAC service cord wire is AWG #10 50A, 120 VAC service cord wire is AWG #6 Service cords are 25 and 50 Cords are rated for 50 length Limit for #10 wire carrying 30A is 60 Ch 2 Wire Size Selection Table When two 30A service cords connected together, safe current is limited to 20 Amps Similar problem for two 50A cords MElec-Ch4-14
15 Boat s Service Entrance Has a maximum current rating Size for the service cord Service switch is DPST Breaks hot and neutral wires Normally left On If power is lost and circuit breakers are On Check service entrance switch Using one 30A service cord, rather than two and configuring power panel for one cord Service switch will trip if exceed 30A total MElec-Ch4-15
16 Priority Usage Table Maximum current limited by smaller of: Dockside outlet and circuit breaker Service cord Service inlet and service switch (circuit breaker) Following table gives typical AC power use Everything cannot be on at same time Prioritize demand based on limiting factor MElec-Ch4-16
17 Priority Scheme MElec-Ch4-17
18 Shoreside Utility System Utility Power Distribution Shoreside Outlets Dockside Service Drop Shore Power Service Cable Connector Standards and Adapters Service Entrance and Distribution MElec-Ch4-18
19 Utility Power Distribution Power lines are at 2,300 VAC or higher Output from last transformer is 120/240 V If loads are balanced, no current in neutral Hot wires are Black and Red 120 VAC from either wire to neutral 240 VAC between black and red wires Center tap of transformer is grounded No current flows in ground (green) wire MElec-Ch4-19
20 Shoreside Outlets MElec-Ch4-20
21 Dockside Service Drops Shoreside power: 120/240 V 60 Hz Cords and plugs are called 125 or 125/250 V Boats under 30 : usually one 30A service cord Boats between 30 & 40 : may use two 30A cords Larger boats: one or two 50A 125/250 V cords Neutral wire is grounded only at transformer Inadequate service (brownout) Line voltage under 100 VAC May damage motors (refrigerator, air-conditioner) MElec-Ch4-21
22 Shore Power Service Cable Flexible, durable and oil/moisture resistant Called Hard Service Cable Compliant with NEC article 555 Outlets are female; Plugs are male Outlets / plugs are polarized with twist lock Outlets are keyed to prevent mismatch V /250 V MElec-Ch4-22
23 Connector Standards 15A 125V 20A 125V 30A 125V 50A 125V MElec-Ch4-23
24 Adapters 15 A to 30 A 50 A to two 30 A 50 A 125/250 to one 30A 125 V Reverse Y Two 30A 125 V to One 50A 125/250 V MElec-Ch4-24
25 Service Entrance & Distribution Service Entrance Connector Isolation Transformer Galvanic Isolator AC Distribution Panel Branch Circuit Conductors MElec-Ch4-25
26 Service Entrance Connector Normally one or two 30A 125 V or 50A 125 V or 50A 125/250 V Most houses have 200A 125/250 V Close weatherproof cover when not in use Clean contacts with Electronic Cleaner Sequence for Shore Power service cord Turn Off all circuit breakers Connect boat end first Then connect shore end Turn On shore circuit breaker Check Reverse Polarity for proper connection Turn On boat Main then Branch circuits MElec-Ch4-26
27 Isolation Transformer No direct electrical connection between boat and shore power Avoids reversed polarity hazard Stops stray current Big $ and weight MElec-Ch4-27
28 Galvanic Isolator Solid state - large capacitor and power diode In series with green ground wire Blocks DC and low AC voltage Stops Stray current MElec-Ch4-28
29 Boat AC Distribution Panel Review of Chapter Two Normally combined with DC power panel Main (Shore Power) circuit breaker Not Service Switch (near input connector) Breaks both hot and neutral Branch circuit breakers Breaks only hot wire All AC circuits are 3-wire MElec-Ch4-29
30 Branch Circuit Conductors Review of Chapter Two Wiring is stranded 3-wire UL 1426 BC cable Normally 14 AWG for 15A circuits Normally 12 AWG for 20A circuits All neutral & ground wires returned to panel Support wires every 18 Ring connectors on both ends of wires MElec-Ch4-30
31 On-Board Generators Inverters Propulsion-engine driven generator Auxiliary-engine driven generator Isolation from Shore Power Entrance MElec-Ch4-31
32 Inverters Convert DC to AC 12 VDC to 120 V 60 Hz Efficiency 90 to 95% Sizes from 50 to 3,000 watts 1200 watts of 120 VAC draws 110A of 12 VDC Outputs are 120 V 60 Hz True Sine Wave are expensive Run all loads Modified Sine Wave are less expensive May damage sensitive electronic equipment MElec-Ch4-32
33 Modified Sine Wave Modified Sine Wave and Sine Wave Voltage Either waveform will deliver the same power to a resistive load MElec-Ch4-33
34 Inverters - 2 Automatically disconnect output when shore power or generator power is connected May produce interference Mitigation is discussed in Chapter 7 Combined Inverter/Charger (illustrated) Either charge batteries or generate AC Lighter and cheaper than separate systems MElec-Ch4-34
35 Propulsion-Engine Driven AC Generators driven by propulsion engine Can only be used while underway Will not produce full output at idle Not as efficient as auxiliary driven generator MElec-Ch4-35
36 Auxiliary-Engine Driven Directly coupled to small gas or diesel engine Fuel should be same as propulsion engine Solution if need over 2 Kw of 60 Hz power Big, heavy and noisy MElec-Ch4-36
37 Isolation from Shore Power Inverters automatically only provide power to AC bus when no other AC power is present On-board Generators must also be isolated Normally done by transfer switch Neutral and ground are connected at generator MElec-Ch4-37
38 Summary Polarity reversed: Don t use shore power Nominal shoreside power: 120/240 volts, 60 Hz Maximum current limited (smaller of): Dockside circuit breaker, dockside outlet Service cord and boat s service entrance Priority scheme for AC appliances needed Outlets must be 3-wire polarized GFCI in galley, head, machinery spaces & weather deck Inverters: for short term loads under 2 Kw Generators: for long term loads over 2 Kw Use transfer switch with inverter or generator MElec-Ch4-38
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