You should run 3- #4 insulated wires for your 2 hots, and neutral. A 125-amp panel is large enough for a small home with a few large appliances. Never bond your ground and neutral in a sub-panel, not only is this against code, but it is extremely dangerous since it can create a hot ground. There should be no bonding of the ground and neutral in the sub panel. Below are the best selling wires our customers use for service to a 100 amp sub-panel - all available by the foot at our store WireAndCableYourWay.com COPPER 1.) A sub-panel in the same structure requires only a 4-wire feeder and the neutrals and EGC’s isolated. Hello all. 15 ft. from the main panel in the basement. The ampacity of the subpanel does not determine the feeder size. #3 THHN/THWN-2 Wire for 100 Amp Sub-Panel. (this would be the bare minimum) You could always run 500s and be prepared for the future as well ) I plan on using 2 #2/0 with a #4 neutral and #4 ground. My question is about Grounding a Sub-Panel: I am installing a 200 amp sub panel to an existing structure that is 200 plus feet away from the main panel. I have some 4/0 al wire. If the panel is full, you may have to shift one of the 240-volt circuits or two 120-volt circuits to the subpanel to make room. Grounding a Sub Panel at a Detached Building Electrical Question #1: Do I need to run a ground wire for a 200 amp sub panel that is 200 feet away from the main panel? Trying to determine the appropriate size electrical wiring is a very common issue among homeowners and certified electricians alike. Single Conductor #3 gauge THHN Copper Wire I always just use 1/0 for 100 amps now since it is readily available around here and #1 is not. GE 200 Amp 32-Space 64-Circuit Main Lug Indoor Load Center Contractor Kit (44) Model# TLM3220C64GK ... Related Searches. So you can use a 200 amp rated panel with a 100 amp main breaker for it, as long as the sub feeder is rated for 100 amps also. How did you get #1 wire into a 100 amp breaker? Size the electric wire for the circuits according to the size of the circuit breaker. Looking for the right size wire for your 100 amp sub-panel for a detached building, garage, or shed? Outside of the conduit, run a #4 solid copper ground wire. Re: 125 amp sub panel 2 AWG copper conductors are sufficient, exactly as Bob has mentioned. It doesn't matter what size panel you use as long as the overcurrent protection is not larger than the panel rating. If you’re trying to determine the right size wire for your 100-amp sub panel that is 200 feet away, 1-gauge wire is your best bet. The cable will be direct buried, so no conduit. I have a 200 amp panel and want a 125 amp sub panel using the 4/0 seeing as i already have it being it is left over for 200' run to breaker/meter at road. The new sub-panel is a 240V/125A panel without a main breaker, and the neutral and ground bus are connected. For safety reasons, it is crucial that you select the right gauge for your project. You say: " I looked it up, and it looks OK," What size ground wire is required to tie a sub panel to a main panel for a 50 amp supply to sub panel. I am installing a new sub-panel fed from my main house panel. Also as noted, any sub panel needs to have the ground and neutral un-bonded. Loosen an available lug on the neutral bus, which is silver, and insert the end of the white wire. This kit, although sold as a sub-panel, does not come with a grounding bar, so you need to buy one or use a wire nut. Connect the neutral wire to the neutral bus and the ground wire to the ground bus, turn on the main breaker and the subpanel breaker and the subpanel is energized. Prior to the 2008 NEC that feeder could be 3-wire with the neutral bonded, 2008 and post 2008 code cycles a 4-wire feeder is required. 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