100 Amp Panel Ground Wire Size

Although the minimum size grounding electrode conductor is typically 8 copper for a 100 amp service it s actually determined by feeder size not amperage the nec requires that conductors smaller than 6 be physically protected usually conduit.

100 amp panel ground wire size. You also need to drive two ground rods unless you can show the single rod has a resistance of 25 ohms or less. 1 3 thhn thwn 2 wire for 100 amp sub panel. Around here and in the 2011 code the minimum size gec grounding electrode conductor to a driven rod is 6 copper 4 cu if subject to physical damage.

This is based on nec nfpa 70. National electrical code nec 2014 edition table 250 122. It also depends on the materials.

Looking for the right size wire for your 100 amp sub panel for a detached building garage or shed. The cable must contain one or two hot wires depending on your needs one neutral wire and one ground wire. Single conductor 3 gauge thhn copper wire.

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 ground conductor size calculator will calculate the proper ground conductor size for grounding raceways and equipment based on ampere rating or setting of automatic overcurrent protection device in circuit ahead of equipment. Typically 2 awg is suitable for an enclosed inside conduit circuit.

It has a 8 gauge wire insulated ground connected back to the main. A 6 awg bare copper conductor is used to ground a. What is the correct wire size for a 100 amp sub panel.

Each wire should be 2 gauge in size. The ampacity of the conductor used determines that. What size ground wire is needed for a 100 amp service panel.