125 Amp Sub Panel Ground Wire Size
The ground wire is bonded at the main panel to the ground system.
125 amp sub panel ground wire size. The wire size according to codehas to be up sized to 125. The wire size chart below shows allowable ampacities of insulated conductors rated up to and including 2000 volts 60 c through 90 c 140 f through 194 f not more than three current carrying conductors in raceway cable or earth directly buried based on ambient air temperature of 30 c 86 f. The calculator allows entry of a voltage drop but caution should be used when doing so to make sure you are calculating the wire sizes in accordance with nec article 210 19 fpn no.
4 the nec allows a maximum of a 3 voltage drop on the main branch of a circuit at the farthest outlet of power and 5 total to both feeders and branch circuits to the farthest outlet. What wire size do you need for a 125 amp panel with a 100 amp main breaker. Calculate the size of ground wire for a given circuit or motor by selecting the ampere rating of the circuit protection device.
Sub panels are grounded through the cable that provides the sub feed circuit power. A 3 copper conductor with an insulation factor of 90 degrees c is rated at 115 amps. Grounding a sub panel.
I assume i need to run 4 wires 2 hot 1 neutral and 1 ground. The run is no more than 100ft. The sub feed wiring type and size will depend on the specific.
291 67 x 125 364 6. This sub feed cable will have 2 insulated power conductors 1 insulated neutral conductor and one ground wire. 500mcm copperwire with an insulation factor of 75 and 90 degrees c is rated at380 and 395 amps respectively.
I understand i could use a 125 amp breaker but i do not need the additional amperage.
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