Two wires under one lug?

[Isaiah]

One of our inspectors stated it is a violation to have two wires under one lug - in this case, two #12 green grounding conductors.


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[roger]

Depends on what he is talking about. If the lug or bar is listed for more than one wire, EGC's are allowed to be in Load centers. OTOH if he was talking about the Grounded conductor he would be right.

 

[infinity]

One of our inspectors stated it is a violation to have two wires under one lug - in this case, two #12 green grounding conductors.

As Roger stated it depends on what you're calling a lug. This is a violation unless the terminal is listed for more than one conductor. Most are not so listed.

 

[Isaiah]

As Roger stated it depends on what you're calling a lug. This is a violation unless the terminal is listed for more than one conductor. Most are not so listed.

View attachment 2565858

Thanks Roger and Infinity.
The inspector also cited ARC FLASH labeling -stating it did not contain ‘available fault current’ for fused disconnect switches and lighting Panelboards However, the labels were provided by the vendor - not by us. Do you suggest we add a label stating the total AIC?


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[ActionDave]

Available fault current is something you have to calculate based on your install. You need POCO transformer size, service conductor size and length, some other stuff... Eaton has a calculator that can help.
https://www.eaton.com/content/dam/e...alculator/bus-ele-pp-10106-fc2-mobile-app.pdf

 

[jim dungar]

As ActionDave said, you need to calculate the available fault current. The AIC of your equipment needs to be greater than the fault value you calculate, so a preliminary, worst case, calculation should be done before service gear is ordered.

 

[Isaiah]

As ActionDave said, you need to calculate the available fault current. The AIC of your equipment needs to be greater than the fault value you calculate, so a preliminary, worst case, calculation should be done before service gear is ordered.

Many thanks to Dave and Jim!


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[don_resqcapt19]

Thanks Roger and Infinity.
The inspector also cited ARC FLASH labeling -stating it did not contain ‘available fault current’ for fused disconnect switches and lighting Panelboards However, the labels were provided by the vendor - not by us. Do you suggest we add a label stating the total AIC?


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The rule in 110.16(A) only requires the application of a generic arc flash warning label ....that does not require the available fault current to be on the label.

If the equipment is service equipment in other than one and two family dwellings, 110.16(B) will apply and you will need a label that complies with 70E. Starting in the 2023 code you will also need a 70E compliant label for feeder supplied equipment rated 1000 amps or more.

Note that the code does not directly say 70E, but says "arc flash label shall be in accordance with applicable industry practice". The applicable standard practice is defined in 70E.

 

[Isaiah]

The rule in 110.16(A) only requires the application of a generic arc flash warning label ....that does not require the available fault current to be on the label.

If the equipment is service equipment in other than one and two family dwellings, 110.16(B) will apply and you will need a label that complies with 70E. Starting in the 2023 code you will also need a 70E compliant label for feeder supplied equipment rated 1000 amps or more.

Note that the code does not directly say 70E, but says "arc flash label shall be in accordance with applicable industry practice". The applicable standard practice is defined in 70E.

Many thanks Don


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