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- Massachusetts
It must be a large burden being the only good electrician.
The above is your opinion of the code, not every AHJ feels the same way.
EGC sizing
- Thread starter ggunn
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It must be a large burden being the only good electrician.
The above is your opinion of the code, not every AHJ feels the same way.
I agree, they have not made it easy. There is a good explanation in the SOARES book which dedicates a chapter to the requirements needed to clear ground faults and short circuits.
Actually I'm just reading the note, not offering an opinion. The note is very specific, "Where necessary to comply with 250.4(A)(5) or (B)(4), the equipment grounding conductor shall be sized larger than given in this table." There is no way to know if it is necessary or not without doing the analysis. That's a fact. An AHJ can choose to ignore it, but that does not change what it is.
If you use 250.122 to size my egc for my ungrounded DC conductors not exposed to physical damage ac conductors to the minimum in the code and AHJ approves and you
still install a larger one just because u think your right your wasting $$$$.
Come on man
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still install a larger one just because u think your right your wasting $$$$.
Come on man
Sent from my SAMSUNG-SM-N920A using Tapatalk
- Location
- Massachusetts
It is up to the AHJ to determine how this is to be determined, that is a fact.
Don't point to the Soares book as that is not the code.
Please point to the NEC section that describes the criteria to be meet.
I did, it's here, "Where necessary to comply with 250.4(A)(5) or (B)(4), the equipment grounding conductor shall be sized larger than given in this table."
(A)(5) Effective Ground-Fault Current Path. Electrical
equipment and wiring and other electrically conductive material
likely to become energized shall be installed in a
manner that creates a low-impedance circuit facilitating the
operation of the overcurrent device or ground detector for
high-impedance grounded systems. It shall be capable of
safely carrying the maximum ground-fault current likely to
be imposed on it from any point on the wiring system
where a ground fault may occur to the electrical supply
source. The earth shall not be considered as an effective
ground-fault current path.
(B)(4) Path for Fault Current. Electrical equipment, wiring,
and other electrically conductive material likely to become
energized shall be installed in a manner that creates a lowimpedance
circuit from any point on the wiring system to
the electrical supply source to facilitate the operation of
overcurrent devices should a second ground fault from a
different phase occur on the wiring system. The earth shall
not be considered as an effective fault-current path.
What part of this do you need help understanding iwire? I'm happy to help you out. Neither of these sections say you can select an EGC from 250.122 and be done.
As I often say, "safety does not sell." That's why we have codes and standards, for people who say safety is a waste of money.
- Location
- Massachusetts
No, you did not provide what I asked of you. I am very familiar with the sections you posted.
The part I need 'help with' (LOL) is the criteria found n the NEC used to determine if you have meet the stated requirements of 250.4(A)(5) or (B)(4).
Do you just guess?
Lets say I am a designer / installer and you are the inspector. I Install a long circuit, when you inspect it you fail me citing 250.4(A)(5) or (B)(4).
How did you determine it was non-compliant?
This is exactly the same issue as the 'neat and workmanlike' issue we have discussed. To have enforceable rules you need clear directions as to what is required.
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