Run 100 Amp Wire Under Roof

If you want to use aluminum you need at least 2 gauge or perhaps 1.

Run 100 amp wire under roof.

The run to the garage lug to lug is 65 and i have to bury the cable to meet code and am going to put it in sched 40 conduit. 100 yards 300 foot. What sz of direct burial wire for 200 amp service 200 away coming from on the ground transformer. You need a 3 3 3 5 copper ser cable to carry 100 amps that s three 3 gauge for the two hot wires and the neutral and a 5 gauge for the ground.

When it comes to the lines connecting master and secondary panels where the line will carry as much as a full 100 amps use a 2 gauge non metallic sheathed electrical cable. The cable must contain one or two hot wires depending on your needs one neutral wire and one ground wire. Use thwn 2 14 gauge stranded wire if you get power from a 15 amp circuit or thwn 2 12 gauge stranded wire for a 20 amp circuit. Per the i a e a table 4 0 copper will go 323 foot before the voltage drops 3 from your nominal.

Assuming the voltage is 240 volts the wire size for a 100 amp panel at the end of 400 feet and holding the voltage drop to 3 the wire will be 3 0 in size. Single conductor 3 gauge thhn. I plan to install a 100 amp circuit breaker in the house panel. Each wire should be 2 gauge in size.

The next logical size is 250mcm which will go 383 foot. A 100a breaker would require a 8 cu or a 6 al. Someone stated the 100 amp panel won t take the wire size. Your grounding conductor must be run also and it is sized to the breaker also.

I m wiring a 100 amp garage sub panel from a 200 amp main in my house. What size under ground wire do i need. You ll need two wires one white and one black for one circuit or more if you intend to wire a three way switch from the house or add more than one circuit. Data from the gould shawmut book of electrical information.

Looking for the right size wire for your 100 amp sub panel for a detached building garage or shed. On 2019 03 20 by paul. Need to carry 100 amps 500 feet. On 2019 03 28 by mod paul more detailed wire sizing help including run length and wire size increases are at se cable sizes vs amps.