NEC code requiring lug covers on MLO panel?

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gust1j

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Installing a new 208/120V, 100A, Square D MLO panelboard fed from an existing distribution panel for a job. The project manager rejected the panel I submitted because I did not submit a lug cover for the MLO lugs, therefore not meeting the new NEC Code Requirement (he did not reference the code in his response). Is there a code that requires a lug cover at the connection point of an MLO panel?

He also left a comment that an Arch Flash Label is required. This is the first new panel I've had to provide, in the past I've been able to use existing panels that already have arch flash labels. Does the manufacturer of the panelboard (Square D) typically provide an Arch Flash Label or do I need provide one?

Thanks
 
There is nothing in the 2020 code that requires lug covers on panels other than those that contain the service disconnect. This is likely to change in the 2023 code, but is not a current code requirement.

The only NEC rule that applies to the arc flash label for this panel is the one in 110.16(A). This rule only requires the generic warning label that is typically provided by the panel manufacturer.

In larger facilities, the project specifications often require a arc flash label that meets the requirements of NFPA 70E.
 
don_resqcapt19 said:
There is nothing in the 2020 code that requires lug covers on panels other than those that contain the service disconnect. This is likely to change in the 2023 code, but is not a current code requirement.
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The motivation being, I assume, that the service conductor lugs do not have effective overcurrent or short circuit protection.
 
GoldDigger said:
The motivation being, I assume, that the service conductor lugs do not have effective overcurrent or short circuit protection.
Click to expand...
Actually, just that there is no easy way to de-energize the conductors on the line side of the service disconnect.
 
I am not sure what good it will do to protect the main lugs as the bus bar is still energized. I guess it offers some extra protection.
 
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