Wiring Unlimited Contents
1. Introduction and Disclaimer............................................................................................................................ 4 2. Theory ............................................................................................................................................................. 4 2.1 Ohm’s Law..................................................................................................................................................... 4 2.2 Power ............................................................................................................................................................ 4 2.3 Conductivity and resistance .......................................................................................................................... 5 2.4 Current, cable resistance and voltage drop.................................................................................................. 6 2.5 Negative effects of cable voltage drop ......................................................................................................... 8 2.6 DC ripple.................................................................................................................................................. 9 3. Battery bank wiring....................................................................................................................................... 12 3.1 Battery bank.......................................................................................................................................... 12 3.2 Large battery banks..................................................................................................................................... 13 3.3 Parallel battery bank wiring ........................................................................................................................ 14 3.4 Battery bank balancing ............................................................................................................................... 15 3.5 Battery bank midpoint ................................................................................................................................ 16 4. DC wiring ....................................................................................................................................................... 18 4.1 Select the right cable................................................................................................................................... 18 4.2 Busbars........................................................................................................................................................ 20 4.3 Cable connections ....................................................................................................................................... 21 4.4 Fuses............................................................................................................................................................ 23 4.5 Battery isolation.......................................................................................................................................... 24 4.6 Shunt ........................................................................................................................................................... 25 4.7 Parallel and/or 3 phase system DC wiring .................................................................................................. 26 4.8 Large system busbars.................................................................................................................................. 27 4.9 Voltage sensing and compensation ............................................................................................................ 27 4.10 Solar array design...................................................................................................................................... 28 5. AC cabling...................................................................................................................................................... 30 5.1 Power generation........................................................................................................................................ 30 5.2 Distribution networks ................................................................................................................................. 30 5.3 System current VA and Watt....................................................................................................................... 31 5.4 AC wiring ..................................................................................................................................................... 32 5.5 Fuses and circuit breakers........................................................................................................................... 33 5.6 AC bypass switch......................................................................................................................................... 33 5.7 Special considerations for AC wiring of parallel and/or 3 phase inverter/chargers ..................................... 33 6. Grounding, earth leakage and RCD............................................................................................................... 35 6.1 RCD.............................................................................................................................................................. 35
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