Neutral sizing when EGC is upsized

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Dennis Alwon said:
But it only states that the combined conductor must be the larger of the two tables for grounding electrode conductor or equipment grounding conductor. What am I not seeing
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Not much. :)
As long as you compare the neutral size to the table requirement for the EGC rather than the table requirement for the GEC even though they are both the same physical wire.
 
GoldDigger said:
Not much. :)
As long as you compare the neutral size to the table requirement for the EGC rather than the table requirement for the GEC even though they are both the same physical wire.
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That's not exactly right... as we're talking about upsized ungrounded conductors, which has the consequence of upsizing the EGC, and cascades to the grounded conductor.

In the scenario jagged' mentions, i.e. combo EGC/GEC, the required grounded conductor size is still not smaller than the required EGC, i.e. not the minimum required EGC/GEC combo.
 
Smart $ said:
In the scenario jagged' mentions, i.e. combo EGC/GEC, the required grounded conductor size is still not smaller than the required EGC, i.e. not the minimum required EGC/GEC combo.
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That is how I saw it and is why I wondered what I was missing. This does not seem to change what I had been saying all along.
 
Dennis Alwon said:
The op was asking about a minimal size grounded conductor matching the equipment grounding conductor, and then asked if the neutral conductor must be increased if the equipment grounding conductor was increased. I stated the neutral cannot be smaller than the equipment grounding conductor so it had to be increased also. I don't see where my answer did not address the question.
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I may have stepped on your toes a little - or at least misunderstood something you said.

Dennis Alwon said:
250.122 also includes 250.122(B)
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That was kind of my main point of emphasis earlier.
 
Dennis Alwon said:
That is how I saw it and is why I wondered what I was missing. This does not seem to change what I had been saying all along.
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I was just riffing on the interpretation that the EGC in 705.95(B) is the required EGC size not the actual EGC size.

We may get to 200 posts yet. :lol:
 
I have always interpreted this as meaning that the neutral cannot be smaller than the EGC, no matter how the EGC got to be the size it is. It sure is a lot simpler that way and it can never be wrong.

That's kinda the difference between the exams and the real world, innit? The test may ask what the smallest size wire is that can be used in an application, where in the real world the question is, "Will that #10 wire I have out in the truck be big enough?"
 
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