roy g

Status
Not open for further replies.
R

roy g

Member
we recently received a bid request on an lighting job on an existing athletic field. The service for the six metal light poles, each having 12, 1500 watt MH fixtures is supplied through a customer owned, 75KVA transformer with 7200v primary and 240 v sec. The switching for the lights is done by an electrically operated high voltage switch on the primary side of the transformer. The trans secondary , feeds underground directly to the poles in a daisy chain circuit. An 100 amp disconnect on each pole provides the disconnecting and fusing means for each pod of ballasts. When the job was installed (about 25 years ago), no equipment grounding conductor was installed with the feeder wires going to the poles. A driven ground rod at each pole apperantly was meant to serve as the grounding means. I am told that a person received a shock when touching the pole and an adjacent chain link fence, due to a fixture capaciator going to ground. With that background, the current plans to upgrade the system include installing combination SE rated contactors on the secondary side of the transformer, eleminating the HV switch. In addition the plans call for a # 2 ariel cable to run form the new service to the poles, grounding to the disconnects, poles, installation of new grounding rods, etc as would be expected on an upgrade. My question is, will running the arile cable meet the intent of the code for equipment grounding or would it have to be ran with the feeder conductors supplying the poles. Any help and code reference is appreciated>
 
roy g

thanks for reply. my thought was a code violation of 250.134B and also 250.32 B-1 as a structure supplies by a common service.
 
roy g

the question wasn't on the disconnects on the secondary of the trans, but if it met code to run an equipment grounding wire through the air instead of with the conductors (underground) feeding the poles. thanks, roy
 
Status
Not open for further replies.
Top