Both section 240.4(F) & 240.21(C)(1) clearly state "multiphase (other than delta-delta 3W) transformer secondary conductors are NOT considered protected by the primary OCPD." I have been looking over some past approved electrical plans and none of the 480V, 3 phase, 3 wire, delta primary to 120/208V, 3 phase, 4 wire, Y secondary's have a seperate OCPD for the secondary conductors. Instead, the secondary conductors are approved & installed as tap conductors, protected only by the primary OCPD. Am I missing something or reading this wrong?
Last edited by Up2code; 06/20/12 05:30 PM.
