Nec 250.112 C Single EGC multiple circuits

Jpflex

Jpflex

Electrician big leagues
Location
Victorville
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Electrician commercial and residential
If you had a 3 phase circuit in the Same raceway (non metalic raceway and not useable as EGC) for a 30, 60 and 100 ampere OCPD circuit

You would be required to used to run atleast ONE EGC at 8 AWG copper NEC 250.122

However how would you terminate or bond this #8 EGC to your smaller 30 and 60 ampere cercuit device terminations that would not accept this large of an EGC?

IF you pigtailed a smaller wire to the larger 8AWG such as with wire nuts it would appear as a "tap" without upstream OCPD but not be a tap?

Or would there be any nec strtictions of transitioning / splicing a smaller EGC to a larger EGC as there are with ungrounded conductors, feeders and services?
 
ptonsparky said:
There is no restrictions on the amount of current on an EGC. The more the better.
Click to expand...
No but there is size limits for EGC based on the size of largest upstream OCPD determined from assumed max current on an EGC for a short period short circuit or ground fault

I Just thought it would look weired to splice a small ground jumper to a larger ground jumper almost like a tap
 
Jpflex said:
However how would you terminate or bond this #8 EGC to your smaller 30 and 60 ampere cercuit device terminations that would not accept this large of an EGC?

IF you pigtailed a smaller wire to the larger 8AWG such as with wire nuts it would appear as a "tap" without upstream OCPD but not be a tap?

Or would there be any nec strtictions of transitioning / splicing a smaller EGC to a larger EGC as there are with ungrounded conductors, feeders and services?
Click to expand...
No problem at all. Just splice down to each circuit's appropriate EGC size. The #8 need not stay that size to every outlet. It's not a CCC, so OCP and tap rules don't apply.
 
After all, why would anyone object to part of a 30a circuit's EGC pathway being #8?

If the conduit was metallic, each outlet's EGC would only need to suit that circuit.
 
Jpflex said:
If you had a 3 phase circuit in the Same raceway (non metalic raceway and not useable as EGC) for a 30, 60 and 100 ampere OCPD circuit

You would be required to used to run atleast ONE EGC at 8 AWG copper NEC 250.122

However how would you terminate or bond this #8 EGC to your smaller 30 and 60 ampere cercuit device terminations that would not accept this large of an EGC?

IF you pigtailed a smaller wire to the larger 8AWG such as with wire nuts it would appear as a "tap" without upstream OCPD but not be a tap?

Or would there be any nec strtictions of transitioning / splicing a smaller EGC to a larger EGC as there are with ungrounded conductors, feeders and services?
Click to expand...
There is no such thing as a tap as defined in Article 100 for EGCs because they never have overcurrent protection.
There are no restrictions on splicing or tapping an EGC, as long as the tap is sized based on the overcurrent protective device that the smaller EGC is connected to.
 
Mea
Jpflex said:
No but there is size limits for EGC based on the size of largest upstream OCPD determined from assumed max current on an EGC for a short period short circuit or ground fault

I Just thought it would look weired to splice a small ground jumper to a larger ground jumper almost like a tap
Click to expand...

don_resqcapt19 said:
There is no such thing as a tap as defined in Article 100 for EGCs because they never have overcurrent protection.
There are no restrictions on splicing or tapping an EGC, as long as the tap is sized based on the overcurrent protective device that the smaller EGC is connected to.
Click to expand...
Yea thats what i was asking, if doing so would be a conflict somewhere else in nec code.
 
ActionDave said:
Like when you land a 2AWG EGC conductor in a feeder panel and land all 12AWG EGCs on it?
Click to expand...
Not normally like this because there are specific busses for this and proper sized terminations.

I dont think wire nuts will accept #8 with more wire
 
Where more than one current carrying conductor is within the enclosure you can use a single EGC so long as it is capable of handling the largest of the CCC ratings. I've even installed a small bus bar to accommodate the interconnection of the multiple EGCs to the one.
 
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