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It's a CEE, one, common grounding electrode. (3) Concrete-Encased Electrode. A concrete-encased electrode shall consist of at least 6.0 m (20 ft) of either (1) or (2): (1) One or more bare or zinc galvanized or other electrically conductive coated steel reinforcing bars or rods of not less...

jghrist, Today must be my lucky day, because I agree with what you say. There will be some neutral current on the grounding electrode system (this cannot always be avoided). But why make it worse? My point was - not to make it worse by installing that extra conductor between the services...

che, It is not a dual fed service. It is not double-ended. I'm not being critical, but you don't seem to understand the configuration. In addition, you would be incorrect in that "All grounding conductors are grounding electrode conductors," if that is what you are stating. But thanks for...

1. Good point. But for the purposes of this discussion, assume that the grounding electrode conductor (GEC) is not spliced. It is a wire, which is connected to steel in the footing with the correct clamp, and inspected prior to the pour. That is what I have for this particular installation. 2...

Here are my responses for your consideration: 1. And how would a concrete-encased electrode "break?" I've never heard of one "breaking," ever. It's a concrete footing with steel bars, tied throughout. See 250.52. 2. "It ensures single-point grounding." We are talking about two (2) entirely...

So now for the question -- In order to make things "real safe" my designer added an extra "bonding jumper" BETWEEN Service 1 and Service 2. He states that someone told him that all the electrical services on the building "need to be bonded together." My immediate reaction was that this...

Hello, I have an engineer giving me grief, so I decided to redraw the design and ask the people here. I'm using 2017 NEC. Picture a large building with 2 services at opposite ends of the building. I do realize that the services are not grouped at the same location, but there will be permanent...

It's too blurry.

Speaking as an AHJ, I don't get a warm and fuzzy feeling. What the others have said is true. It must meet 695.3, Article 700, etc., I'm using the 2017. Also take a gander at 695.4(B)(3)(a)(3).

I didn't know that thin mulch was a code-compliant burial method. I'm guessing Florida. Last time I checked, the table was for 0 - 1000 volts. I tried to get this addressed by Code Panel 5, but they rarely listen to inspectors. Seriously, this looks like a nightmare and there are multiple...

Like the others have said, there is a minimum height requirement for disconnects. But it is only found in Article 551 (mobile homes, manufactured homes, etc.) 550.32(F), 2017 NEC You mention though, that this work is being done as part of a town project. They may have their own local...

Are there any pitfalls that I need to be aware of? The MTS is SUSE rated, will use class R fuses, will have a neutral bar-terminal. 120/208 single phase. I am assuming that (in general) the power companies will allow the configuration...?? any thoughts?

My experience has been the structural engineers will avoid doing electrical. The real problem we have is civil engineers attempting to draw electrical designs (even the simplest of designs) and [obviously] having no idea at what they are doing. As a code professional, I wish there was an...

Yes. Agree. So you see the issue with how 250.184 is structured.

Thank you everybody for helping me understand this code better. As stated, an uninsulated neutral would constitute a multigrounded neutral system, yet the NEC has this in the first section, as if it applies to all systems. I will bet that a change will be forthcoming. Thanks again.

Yes. Let's assume over 1000-volts. Code Article is 2017 NEC 250.184(A)(1). Assume solidly grounded neutral system. Code is 2017 NEC 250.184(A)(1). Assume feeder to downstream equipment requires a neutral and a ground. Exception number 1 states that bare conductor can be used for the neutral...

Hello I have a question: Assume solidly grounded neutral system. Code is 2017 NEC 250.184(A)(1). Assume feeder to downstream equipment requires a neutral and a ground. Exception number 1 states that bare conductor can be used for the neutral for direct-buried portions of feeders. But...

I'm not sure how you can say that. There can be leakage on one of the leads only. Point noted that overcurrent will trip if both leads short to ground.

Since the GFCI does not use the equipment grounding conductor in the sensing circuit, GFCIs can protect non-grounding circuits and can replace two-wire (ungrounded) receptacles. However, my specific question deals with an isolation transformer that is protected (receiving power from) a GFCI...

Thanks everyone.