Nec 210.5 (c)

[alex032886]

I had a comment back from city jurisdiction on some plans I submitted for permitting. The comment reads as follows: "Where more than one nominal voltage system exists in a building, each ungrounded conductor shall be identified by phase and system. The means of identifaction shall be permenently posted at each branch circuit panel board." This is a televison broadcast site that is colocated at an existing cell site. I know that our panel ratings and voltages are posted at the panels as it is a requirment for all sites, but could this be refering to the branch circuit that supplies a 400 volt transformer and that I need to mark at the panel that it is doing so? I don't think so but I need some verifacation.

Thanks in advance.

 

[don_resqcapt19]

What voltages are in use at the site? Each ungrounded conductor for each of the voltage systems in use at the site must be identified as to phase and voltage and the method used for this identification must be posted at each panel. One of the most common methods is to use black, red, and blue wire for the 120/208 system and brown, orange and yellow wire for the 277/480 volt system.

 

[cowboyjwc]

I agree with Don.

If you have 120/208 and 277/480 and you are running 400 volts then you need to identify it and it cannot be the same color as any of the others. You would also need to identify the neutral if there is one, but I'm assuming that there is not.

 

[Inspectorcliff]

I had a comment back from city jurisdiction on some plans I submitted for permitting. The comment reads as follows: "Where more than one nominal voltage system exists in a building, each ungrounded conductor shall be identified by phase and system. The means of identifaction shall be permenently posted at each branch circuit panel board." This is a televison broadcast site that is colocated at an existing cell site. I know that our panel ratings and voltages are posted at the panels as it is a requirment for all sites, but could this be refering to the branch circuit that supplies a 400 volt transformer and that I need to mark at the panel that it is doing so? I don't think so but I need some verifacation.

Thanks in advance.

It sounds as if he wants you to verify the different voltages at the same location, so as to not intermix them inadvertently. Like the other two gentlmen, said, brb for one, and boy for another.