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What size wire do you need for 50 amp sub panel about 150 feet away 120 volts?
Wiki User
∙ 10y ago
The usual allowable voltage drop is 5%, or 6 volts on a 120 v supply. For a 50 amp supply that means the total wire resistance must be (at most) 6/50 ohms, or 0.12 ohms. Because there is 300 ft of wire the resistance per ft must be 0.12/300 ohms per ft, or .0004 ohms/ft or 0.4 ohms per 1000 ft. Wire tables show that #6 AWG wire is needed, with a cross-section area of 13.3 sq mm.
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Answer for USA, Canada and countries running a 60 Hz supply service.
The code book suggest that a 3% voltage drop should be the maximum allowed. A #3 copper conductor will limit the voltage drop to3% or less when supplying 50 amps for 150 feet on a 120 volt system.
Wiki User
∙ 10y ago
Anonymous
Wiki User
∙ 11y agoIf it's a 50-amp panel designed for 100 percent full-time load at 120 volts, you would plug those numbers into a voltage-drop calculator and it will tell you.
A #3 AWG copper conductor pair in conduit, overhead or direct burial will give you 85 Amps with only about 3.6 volts (3 percent) voltage drop.
#4 AWG would give you 4 percent drop (at max current).
#6 AWG would give 6 percent drop, but only 3.6 percent at 30 Amps.
Wiki User
∙ 14y agomin of # 6 thhn copper
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