Equipment grounding conductor

[jumper]

This is an interesting question and I have changed my mind 3 times. I tend to feel that the egc cannot be paralleled unless each run is the same size as Table 250.122 states. No where does it state T. 250.122 or equivalent except in the case of cables-- 310.4(E) - 2008

 

[Twoskinsoneman]

This happens more and more I've noticed. The thread says there is an addition page (in this case page 3) but when I click on it, it brings me back to page 2. eh... what up with that? :?

 

[ActionDave]

This happens more and more I've noticed. The thread says there is an addition page (in this case page 3) but when I click on it, it brings me back to page 2. eh... what up with that? :?

It is a glitch that has been around for some time, even before the most recent format.

If you click on "Settings" (at the top any page) and scroll down to "General Settings" you can select a different number of posts per page other than the default of ten. I selected forty, which is the maximum, and have only had trouble once.

Another trick is to click "Post Reply" and you can see the all of the posts when you scroll down past the reply box.

 

[Twoskinsoneman]

It is a glitch that has been around for some time, even before the most recent format.

If you click on "Settings" (at the top any page) and scroll down to "General Settings" you can select a different number of posts per page other than the default of ten. I selected forty, which is the maximum, and have only had trouble once.

Another trick is to click "Post Reply" and you can see the all of the posts when you scroll down past the reply box.

Thanks for the tips.

 

[petersonra]

I have several 5000amp circuits that I am installing in cable tray. The equipment grounding conductor is supposed to be 700kcmil. I cannot find in the NEC where I can use 2-350kcmil cables instead. is this legal?

solve the problem by using the cable tray as the EGC.

 

[samamelectric]

How would you comply with the last sentence? You need a full sized EGC in each pipe.

Its just one cable tray, not multiple conduits.

 

[jumper]

Its just one cable tray, not multiple conduits.

Pipe, cable tray, trench,.....You still need one full sized EGC.

 

[charlie b]

I am not ?in town? at the moment, and don?t have much time to participate in the forum. But I was asked (in a PM) to offer my opinion, so here it is.

(A) General. . . . conductors of size 1/0 AWG and larger comprising each

phase, polarity, neutral, or grounded circuit conductor shall be permitted to be connected in parallel (electrically joined at both ends).

I believe there are only seven kinds of conductors in the world, and they name four of them here (my emphasis above). I infer that the fifth, sixth, and seventh kinds (i.e., EGC, GEC, and bonding conductors) are not intended to be included in the list. If the rule was intended to cover all types of conductors, they would have either included all types, or they would not have explicitly named four of them. My conclusion: using two smaller wires in place of one larger wire is not an acceptable practice in the case of EGCs.

It may be all well and good to claim that anything not explicitly forbidden in the code is thereby allowed by the code, and that concept is indeed spoken of quite often and freely. But I don?t think there is any statement in the code that actually says that.

 

[ggunn]

It may be all well and good to claim that anything not explicitly forbidden in the code is thereby allowed by the code, and that concept is indeed spoken of quite often and freely. But I don?t think there is any statement in the code that actually says that.

Well, if it doesn't SAY that... ;^)

 

[Twoskinsoneman]

It may be all well and good to claim that anything not explicitly forbidden in the code is thereby allowed by the code, and that concept is indeed spoken of quite often and freely. But I don?t think there is any statement in the code that actually says that.

The code, by all intents and purposes, is the law. If it ain't illegal, it's technically legal. The code doesn't have to say it because it is basic facts.
To me the term "allowed by code" is just the default status if it isn't forbidden.

 

[jumper]

The code, by all intents and purposes, is the law. If it ain't illegal, it's technically legal. The code doesn't have to say it because it is basic facts.
To me the term "allowed by code" is just the default status if it isn't forbidden.

This is why the NEC gets so large and complicated. Every time someone comes up with a new way to do something dangerous, they gotta add another rule. :slaphead:

 

[Twoskinsoneman]

This is why the NEC gets so large and complicated. Every time someone comes up with a new way to do something dangerous, they gotta add another rule. :slaphead:

It's more like someone suddenly realizes what we've done for years is too dangerous.

 

[kendrichchan]

Here is a MH link that says the same thing.

http://www.mikeholt.com/instructor2/img/product/pdf/1220452732sample.pdf

I am little confuse now, after looking at the link, in figure 6-9. I though paralled feed have to have same conductors size and length.
why it allow in figue 6-9. for each phase be diffferent ?
please help me clear up little.
thanks:?

 

[Twoskinsoneman]

I am little confuse now, after looking at the link, in figure 6-9. I though paralled feed have to have same conductors size and length.
why it allow in figue 6-9. for each phase be diffferent ?
please help me clear up little.
thanks:?

the conductors of each phase etc have to be the same.

(B) Conductor Characteristics. The paralleled conductors
in each phase, polarity, neutral, grounded circuit conductor,
or equipment grounding conductor shall comply
with all of the following:
(1) Be the same length
(2) Have the same conductor material
(3) Be the same size in circular mil area
(4) Have the same insulation type
(5) Be terminated in the same manner