Warning Label

[new122]

Hi,

We have Subpanel which is fed from another panel. So Subpanel does not have any disconnect means. In that case what is requirement of NEC/OSHA standard of Label on Subpanel?

Thanks

 

[petersonra]

Hi,

We have Subpanel which is fed from another panel. So Subpanel does not have any disconnect means. In that case what is requirement of NEC/OSHA standard of Label on Subpanel?

Thanks

It has a disconnecting means somewhere, even if it ends up being the service disconnect.

The code only requires some kind of label indicating the source of supply. You would still need that label.

 

[kwired]

What you described NEC calls a feeder. All NEC compliant feeders have a disconnecting means somewhere, you just don't have a local disconnect in the panel. As far as OSHA goes, if you have a main breaker in the panel you still have energized line side terminals when the main breaker is opened and that means you are still working in a cabinet with live components if that is what you turned off.

 

[new122]

Hi Bob,

Thanks for reply. Yes that Subpanel has two source,
240 3-phase from circuit breaker is located on Main panel
120 1-Phase From Main Panel
So what kind of label goes( I mean. should I mention " CAUTION" in first line following by Risk Of electrical Hazard" then what will be best text after that?

 

[petersonra]

Hi Bob,

Thanks for reply. Yes that Subpanel has two source,
240 3-phase from circuit breaker is located on Main panel
120 1-Phase From Main Panel
So what kind of label goes( I mean. should I mention " CAUTION" in first line following by Risk Of electrical Hazard" then what will be best text after that?

how can a panelboard have two sources at different voltages?

In any case, I don't see how this is a cautionary label. it is informative in nature. something like this seems appropriate:

SUPPLIED FROM CIRCUIT #5, LPB-26

(LPB-26 being the designation of the PB is it being supplied from).

 

[kwired]

how can a panelboard have two sources at different voltages?

If it would happen to have two sets of bus structures it could. IDK how common this may be to find though. It is common to see two bus panels but usually one is supplied by the other. Example Square D has panelboards with a section of I-Line breakers for heavier loads, and another section of either QO or NF breakers for the general lighting/other lighter loads, but usually is supplied by the I-line section and is of course same voltage.