UPS wiring within panelboards

[gap]

I'm wondering if it's compliant to use a panelboard as a junction box for UPS wiring. For instance, an existing circuit in a panel needs to be put on UPS power. Can you bring the output wiring of the UPS into the panel and splice them into the existing branch circuit wiring? This would mean that if the service disconnect for the panel was shut down, these wires and splices would still be hot.
regards,
Scott

 

[bdarnell]

Yes, it is permitted, and I see your concern. I think I would identify the circuits and label the panel with a warning that energized conductors may be present even with a loss of primary service.

 

[ron]

I do not see a code violation, but that is minimum only.
IMHO good design practice, is not to mix critical circuits with non-critical circuits. It increases the possibility of failure.
Can you pull the circuit out of the non-critical panelboard and terminate nearby?

 

[gap]

The panel is right next to a firewall so I could--but it would look like hack since the area around where the conductors would reach is already filled with nicely laid out and thought out conduit runs. I think Brad's labeling idea would work best since there would be no no exposed live surfaces in the panel, just wire/wirenuts. I didn't think this was a violation since some genset transfer switch packages come with instructions to wire as such. I just wanted to be sure. Thanks for your input...
Scott

 

[paul]

Done'r a few times in the past, myself, where there was no other option. IE. floorboxes n walker duct.

 

[tom baker]

You could use striped wire, a common color is an orange stripe, IE, black/orange, white/orange....

 

[Pierre C Belarge]

I do not see a code issue here. I do think the labeling is a very good idea. The cover of the panel is a very good location for a small sign that locates the source and the fact it is on a UPS.