Limit on Subfeeding

[JMPE]

I have a main lug panelboard P1 which subfeeds a panelboard P2 via a 3pole breaker. Will the code allow a 3 pole circuit from P2 to a 30kva dry type transformer? Thanks

 

[lakee911]

I don't see why it wouldn't. What do you think the issue is?

 

[charlie b]

The essential rules related to panelboards are,

• It has to be rated to handle the calculated load that it will supply,
• It has to be protected against overcurrent (i.e., a current in excess of its own rating),
• Its feeder has to have sufficient ampacity for the calculate load that it will supply, and
• Its feeder has to be protected against overcurrent (i.e., a current in excess of its ampacity).

There is no rule that limits the number of sub-sub-sub-etc-panels you can install.