I am tapping a 20 amp 120v outside lighting circuit and installing a small transformer to enable myself to wire a 277v sign. The sign only draws 3 amps. My question is, do I have to gound the transformer back to building steel or not? And why?
" Each commercial building and each commercial occupancy accessible to pedestrians shall be provided with at least one outlet in an accessible location at each entrance to each tenant space for sign or outline lighting system use. The outlet(s) shall be supplied by a branch circuit rated at least 20 amperes that supplies no other load."
Would this verbiage suggest having to add another 20 amp circuit for the sign?
Could anyone tell me how you know when you have to bond the transformer back to building steel and when you don't? Is it determined by the size of the transformer?
Thanks for the help,
aug720