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Information by Electrical Professionals for Electrical Professionals

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Title of Information by Electrical Professionals for Electrical Professionals: "Information by Electrical Professionals for Electrical Professionals"

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isolated grounding conductor

Does the NEC allow a single, isolated grounding conductor to be routed (from the same panelboard) between several IG receptacles or does each receptacle require its own isolated grounding conductor?

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Grounding kitchen range to EGC of another branch circuit – Answer

Background
Because you were gracious enough to allow me to post my NEC question to this forum, I thought I would share the answer my AHJ gave to me. The previous post and the NEC references are repeated below so you do not have to find the original post.

Answer
I had an onsite conference with a single trade electrical inspector. The single trade el...

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Voltage Drop Considerations for Long Runs of Low-Wattage LED Fixtures

Fellow electricians and engineers,

I’m designing a pathway lighting system for a residential estate using low-wattage (8W) 120V LED bollard fixtures, spaced ~20 ft apart along a 300-foot one-way run from the panel. Total load: 12 fixtures × 8W = 96W (~0.8A at 120V).

The fixtures are UL-listed, constant-voltage type (not Class 2), and specify an operating range ...

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SD Outside, MSP inside (far away) need a subpanel outside

What's up everyone. I'm trying to find an easier way of doing this. I have a 200a SD outside and the MSP is about 70ft away in the garage on the other side of the house (why it was built like this is beyond me). Ill be installing a subpanel a few feet away from the SD outside. Instead of doing a run from the MSP across the house to the subpanel via the tiny attic, is their any o...

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Bonding XFMR GEC to rebar for ungrounded system

We have a 2000kVA, 15kV-480V, 3ph, 3W, delta-delta ungrounded dry type transformer that ties into a 480V load break disconnect immediately adjacent to the XFMR.
The XFMR GEC comes up thru the concrete mounting pad into XFMR housing. The pad has lots of rebar. So should the rebar be bonded to the XFMR GEC since the switch represents the service entrance? Or does it even matt...

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