I need to run power to a new ground-mounted sign. The nearest circuit is a metal light pole fed with a 277V 20A circuit, but the sign is 120V. I want to mount a 1.5 KVA transformer (277V/120V) to the pole and feed underground to the sign (about 70' away). What are my options for primary and secondary overcurrent protection of the transformer and conductors? Is the 20A breaker that feeds the light pole too big for my primary protection even if I have secondary protection? It seems to be, according to Table 450.3(B). I believe the sign will have a disconnecting means but probably not overcurrent protection and will draw about 7 amps. Any help is much appreciated.
overcurrent protection for transformer
- Thread starter samcon
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