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You are watching: What size ground wire for 200 amp sub panel


I have actually a task coming up where I must install a 200a, 277/480v 3 phase sub panel. It will have its very own 200a breaker in the MDP and a conduit run of 150 feet. Am I appropriate in utilizing 3/0 copper for my feeders and also neutral and 4 copper for my ground? Thanks!
I have a job coming up wright here I have to install a 200a, 277/480v three phase sub panel. It will certainly have its own 200a breaker in the MDP and also a conduit run of 150 feet. Am I right in utilizing 3/0 copper for my feeders and neutral and 4 copper for my ground? Thanks!
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Look at T250.122. The devices grounding conductor only demands to be #6 but if you increase the dimension of the ungrounded conductors then you should proportionally boost the size of the equipment grounding conductor. A #4 devices grounding conductor need to be fine if you rise the ungrounded conductors.It relies on the fill as to whether or not you have to rise the ungrounded conductors
"If the doors of perception were cleansed whatever would certainly show up to male as it is, Infinite. William Blake
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"If the doors of perception were cleansed every little thing would appear to male as it is, Infinite. William Blake
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I would not updimension it either. Plus if money is a factor I am running that new simplull 4/0 alum. and pull it in pretty a lot by myself.
I can not recall the last time I pulled 3/0 copper for a 200A panel.Okay, I never before did.The prints ALWAYS spec"d 4/0 (copper).A #4 bonding conductor IS bumped up a notch.The spec"s generally referred to as out #6. I can not ever recall an EE going for #4.You have #6 + the EMT as a bond.
That does not count. If he runs an EGC conductor, it requirements to be to code, a #4 for 4/0. I understand it"s odd, bereason he have the right to forgo the conductor completely and also usage just the pipe as the EGC.
That doesn"t count. If he runs an EGC conductor, it demands to be to code, a #4 for 4/0. I recognize it"s odd, bereason he deserve to forgo the conductor completely and use simply the pipe as the EGC.
You"re meant to develop to code.Could you have actually an EE spec a 20 Amp circuit run on #16 speaker wire?I guarantee the plans you agreed to plainly shelp in it that you would carry out all installations according to electrical code.
They more than likely didn"t look. Or didn"t care. But you still shouldn"t give advice to people below that is directly against code and can price them most money.

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You"re expected to construct to code.Could you have an EE spec a 20 Amp circuit run on #16 speaker wire?I guarantee the plans you agreed to plainly said in it that you would certainly perform all installations according to electric code.They more than likely didn"t look. Or didn"t treatment. But you still shouldn"t provide advice to human being below that is straight against code and also can price them many money.
Tright here are even more components that must be addressed.Is the neutral taken into consideration a existing moving conductor?Temperature?What is the actual load?310.15(5) Neutrals are not counted in 4 wire 3 phase unmuch less it carries nonstraight tons, than it shall be counted.if you count the neutral then you have actually 4 conductors in a conduit and also have to de-rate 80%.Using the 75 CU level column 310.15 (assuming the OCP favor most over 100 amps is rated for 75C) 3/0= 200A x .8 = 160A240.2(B)If the pack does not exceed the wire ampacity you can go the following dimension up OCP.240.6 lists 175A as the next size. It"s not 200A.4/0=230 x .8 = 184A240.2(B)If the fill does not exceed the wire ampacity you have the right to go the following size up OCP. Your constant load must not exceed this unless you have actually special 100% constant rated gear. 240.6 lists 200A as the following dimension.That"s why EE will spec out 4/0 CU for 4 wire 200A.Voltage drop on 480v 3PH 150" is almost no difference.3/0