NEC Grounding Question - Grounding of CT Metering Enclosures
NEC Grounding Question - Grounding of CT Metering Enclosures
(OP)
This seems like a simple question, but it always generates confusion - at least with me.
For a separate, stand-alone CT Metering cabinet that is remote from the main service disconnecting means, is there a requirement to run an equipment grounding conductor to the CT cabinet in addition to the neutral/ground wire coming in from the utility service transformer? In other words, for the service entrance conductors running from the metering cabinet (outside) to the main switchboard (inside), does the NEC require that a ground wire be run in the conduit along with the three phase wires and the utility neutral?
For a separate, stand-alone CT Metering cabinet that is remote from the main service disconnecting means, is there a requirement to run an equipment grounding conductor to the CT cabinet in addition to the neutral/ground wire coming in from the utility service transformer? In other words, for the service entrance conductors running from the metering cabinet (outside) to the main switchboard (inside), does the NEC require that a ground wire be run in the conduit along with the three phase wires and the utility neutral?
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RE: NEC Grounding Question - Grounding of CT Metering Enclosures
RE: NEC Grounding Question - Grounding of CT Metering Enclosures
Dave
RE: NEC Grounding Question - Grounding of CT Metering Enclosures
Look at all those metal enclosures they used for traffic light controls and power in toronto. The ones that were flush mount on the sidewalk are the biggest problem.Salt gets in and degrades the wires to the point where the enclosure gnd develops high impedance. This combined with hot wires touching the enclosure either because the wires broke down or the enclosure was full of salty water caused the flush mount enclosures to become live.
This killed 3 dogs in the last ten years in toronto.
I tend to think someone didnt gnd the enclosure and the salty water became live.
I am an electrician and it always dumbfounds me when I have to tell journey men to gnd that enclosure. The trade really has some scary workers.