Disconnect for Duplex Pump Control Panel - NEC 430-102

[cvirgil467]

I’m trying to work through whether a duplex pump controller equipped with an integral main disconnect switch (appears to be a rotary‑type, through‑the‑door operator) requires an additional external disconnect to comply with NEC 430.102, or whether the integral main disconnect satisfies the intent of that section. The disconnect is operable without opening the panel cover.

The duplex pump branch circuits include motor circuit protectors located inside the panel, which are not accessible without opening the enclosure.

I may be overthinking this, but my concern is that when the integral main disconnect is placed in the OFF position, the line side of the disconnect remains energized.

From a practical standpoint, this means there is still energized equipment within the controller enclosure, which raises the question of whether this truly meets the intent of disconnecting all ungrounded conductors serving the controller—particularly since access to the controller still places one within the enclosure.

Curious if you have any thoughts or see this differently.

Thanks.

 

[jim dungar]

I may be overthinking this, but my concern is that when the integral main disconnect is placed in the OFF position, the line side of the disconnect remains energized.

This is an operational area of concern by OSHA and NFPA 70E. The NEC is concern with premisis wiring and is not concerned with the majority of operational procedural issues.