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You are watching: What size ground wire for 60 amp service

How does an undersized grounding conductor work? take it an 8-2 NM cable for example, that only supplies a #10 ground. Why doesn"t it require a full size ground? They used to make smaller gauge NM through undersized soil (14-2 v #16 ground), but that"s not enabled anymore. Why go it job-related with higher ampacity circuits?Thanks

The much more I learn the much less I seem come know......

the is two different situations. Conductor ampacity is sized off 310.16 which is basically how many amps that dimension conductor can lug without hurting the insulation. A ground connection conductor is not claimed to bring current so that is size differently.
The much more I learn the less I seem come know......

The grounding conductor go not carry current during normal conditions.It"s minimum dimension is dictated by it"s ability to clear a fault.
So it"s safe to have a #10 lug 60 amps for a an extremely short time. Or is that over simple it? Isn"t fault current sometimes well above that?
It has to do through heat and time.The 10 AWG EGC will trip a 60 amp breaker faster than the 10 AWG heats up to dangerous levels.Keep in mind the existing rating a of wire is always around heat, a 14 AWG copper will carry nearly 200 amps before the copper melts yet of course the insulation would certainly be lengthy gone by that point.Check the end Table 310.21 it shows the ampacity of bare 8 AWG together 98 amps yet the conductor temperature can be close come 176 F.
So it"s for sure to have actually a #10 carry 60 amps because that a really short time. Or is that over simple it? Isn"t fault present sometimes well above that?
If a 60 amp circuit has a error to the EGC the current during that fault will be in the 100s of amps till the breaker opens so even the circuit conductors will certainly be "overloaded" because that a brief time.
Ok. This is simply in basic for circuits right? not there one-of-a-kind rules for warm tubs and so on that require complete size ground? or perhaps I"m think that it needs to be insulated?
The NEC does not require a complete size EGC for warm tubs however if the hot tub instructions call for it (and I have read part do) 보다 110.3(B) would kick in and also you would have to follow the institutions.
the function of a huge ground wire on pool stuff is more for prevention of physics damage, i believe. More difficult to kick a #8 and also have it rest or come loose.
The specs ~ above the MRI equipments we installed dubbed for 2 grounding conductors the very same size together phase conductors. One isolated and one devices ground. We saw terminate and the tools only had actually one place to land. So, one come out.
The grounded conductor must be size the very same as the ungrounded "hot" conductors in most systems to be able to potentualy carry the maximim unbalanced load.......
All copper conductors are defended for your insulation. #10 copper will certainly lug 60 amps v no problem yet that level of current will, end time, damage the insulation . In the occasion of a quick circuit the "current" will only be there for a quick time and the reason of the warm will be unable to do if all is wired correctly.

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The base conductor have to be sized the exact same as the ungrounded "hot" conductors in most systems to be able to potentualy lug the maximim unbalanced load.......
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