Distance between Panelboard - breaker

[CKMEYER]

I recall seeing something in the NEC sometime back regarding the maximum distance you can run a cable from a branch circuit on a panelboard to another panelboard without having to have another main breaker in the second panelboard.

If that sounds convoluted, hopefully this explanation will help. This is for an industrial application. I have a single phase 120VAC power panel with with a 60A main and 18x 20A breakers inside one of our buildings. One of the 20A breakers is feeding a rack that will be outside the building. There will be another 120VAC power panel on the rack powering lights and some other odds and ends - nothing over 2A. As I recall, there is a distance that determines whether or not I need a main breaker on the 2nd power panel (on the rack). Does anyone recall where in the code this was covered? I didn't see it when I was going through it this morning but I could swear I saw it in there some years back.

I would appreciate any input on this! Thanks!

 

[Dennis Alwon]

I don't believe there is any such code. Perhaps you are thinking when you feed another building you need a disconnect or max of 6 disco.

 

[augie47]

In general, I know of no requirement for a breaker at the panel if it has proper protection at the point of supply, per 408.36.

 

[CKMEYER]

Well if it is not there, that would be a good reason why I cannot find it. Thank you for the input gentlemen.

 

[don_resqcapt19]

The rack, if located outside the building, is separate structure and that triggers the rule in 225.31 that requires a means of disconect for the structure. Given that this is an industrial installation, 225.32 exception #1 may permit you to eliminate the disconnect at the rack.