Electrical code ? Wire type indoor vs buried

[Zerk]

Oh I think we are stuck with CA. I doubt the people there will ever change their mind and want freedom.

 

[grsthegreat]

Oh I think we are stuck with CA. I doubt the people there will ever change their mind and want freedom.

well, there is a chance an earthquake will split it off and it will flote away.

 

[grsthegreat]

well, there is a chance an earthquake will split it off and it will flote away.

i moved from that hole in 1993 and never look back.

 

[ultrarunner]

There are still a few of us holding down the fort and home to Kubota.

 

[teejk]

A4. The practice of bonding the grounded (neutral) conductor to the equipment enclosure is only permitted by 250.32(B)(2) where

(1) an equipment grounding conductor is not run with the supply to the building or structure, and

(2) there are no continuous metallic paths bonded to the grounding system in both buildings or structures involved, and

(3) ground-fault protection of equipment has not been installed on the common ac service, and

(4) the size of the grounded conductor shall not be smaller than the larger of:

That required by 220.22 (maximum unbalanced neutral load), or

That required by 250.122 (equipment grounding conductor size).


When an equipment grounding conductor is not run to a separate building or structure, the grounded (neutral) conductor must be used to provide the effective ground-fault current path required to clear any ground-faults (line-to-case faults) in addition to carrying any unbalanced neutral current [250.4(A)(3)].

The recent code changes require "single point" grounding don't they? Meaning you ground at your main panel and any sub-panels are grounded to that? When I built here I had to install a grounding block attached to the driven rods and even the satellite dishes had to return to that block.

 

[hr3]

The recent code changes require "single point" grounding don't they? Meaning you ground at your main panel and any sub-panels are grounded to that? When I built here I had to install a grounding block attached to the driven rods and even the satellite dishes had to return to that block.

You are correct,, some though don't go by 2014 code..

 

[teejk]

You are correct,, some though don't go by 2014 code..

We built here under 2008 code and it was required then...something about "potential indifferences" (which I guess was the cause of stray voltage...I'm an accountant, not an electrical engineer and it made no sense to me). All I know is that if one's state decides to adopt their code to current standards (which might take years) that is the code. In my case, shop building 100' from the main...4 wire from a 100a breaker in the house...subpanel in the shop...not "bonded" and no separate ground. Everything comes back to my house ground rods (which are in sand and probably not very effective). Thinking about grounding my metal building (apart from the electrical) because I was out there a few years ago in a thunderstorm and witnessed a lightning bolt following my radio antenna wire into the shop...but that is not NEC, just "lightening rod".

 

[brown40]

Definitely use 4 wire for a subpanel--an extra layer of protection to send stray current back to the source instead of through other optional conductors. There are variances in code depending on where you live and what you're doing, so worldwide advice is not going to apply to your "current" situation. You really need to check locally. You can get good ideas and advice, but only your CEO cites violations of the code used locally. You want best practice not good enough to work. Don't be surprised to find some head-shakers when you get into your service panel/power supply. It's a good education doing this sort of a project, and worth the extra time and effort to do it right.