J JMPE Member Nov 10, 2010 #1 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
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
L lakee911 Senior Member Location Columbus, OH Nov 10, 2010 #2 I don't see why it wouldn't. What do you think the issue is?
charlie b Moderator Staff member Location Lockport, IL Occupation Semi-Retired Electrical Engineer Nov 10, 2010 #3 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.
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.