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#1552 05/16/01 05:40 PM
A
Anonymous
Unregistered
>I misread the original post. I thought we were talking about paralleling the grounded conductor and an equipment grounding conductor.

From the service main to the utility transformer "a second grounded conductor" is basically indistinguishable from that given that bonding is required in the main.

So long as no one has a problem with parallel grounded conductors I'm happy. I hope Mike is satisfied that this is a good requirement that the utility has imposed on him.

Because of the skin effect reducing ampacity for high frequencies, the day may come when neutrals are routinely specified as two smaller diameter parallel conductors. Don't be surprised if you live to see noise suppression for neutrals as a requirement.

#1553 05/16/01 06:30 PM
Joined: Oct 2000
Posts: 5,392
S
Member
Dspark;
the link is describing an 'upsized' noodle, not a parrallel one

[Linked Image]

#1554 05/16/01 06:42 PM
A
Anonymous
Unregistered
>the link is describing an 'upsized' noodle, not a parallel one

I disagree. Regardless, they are roughly equivalent, parallel being somewhat superior.

I regularly implement 200% neutrals as parallels of the same gage, e.g. #10 or #12.

I have never interpreted specifications for double neutrals as meaning that I should a single #6 instead, which would, I think, somewhat defeat the primary purpose, which is to haul away high frequency noise.

#1555 05/16/01 08:08 PM
Joined: Oct 2000
Posts: 5,392
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Member
Dspark;

http://www.afcweb.com/mctype.html#tuff

note the manufacturer's upsized noodle because they CAN NOT sell a parralleled one.

[Linked Image]

#1556 05/17/01 08:21 AM
Joined: Nov 2000
Posts: 2,148
R
Member
Dspark,
If it is a grounding conductor and not a neutral, then it will most likely not be of the same size. If the 2 conductors are of unequal size and joined at both ends it would be a violation of 310-4
Don(resqcapt19)


Don(resqcapt19)
#1557 05/17/01 05:03 PM
A
Anonymous
Unregistered
>If the 2 conductors are of unequal size and joined at both ends it would be a violation of 310-4
But how about two conductors of equal size, e.g., two #10 wires?

#1558 05/17/01 10:17 PM
Joined: Oct 2000
Posts: 5,392
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Member
Dspark,
please show me where in the NEC that parrallel #10 nuetrals are allowed.

[Linked Image]

#1559 05/17/01 11:27 PM
A
Anonymous
Unregistered
I think you would have to show why they are disallowed.

#1560 05/18/01 07:06 AM
Joined: Oct 2000
Posts: 5,392
S
Member
310-4-ex4

#1561 05/18/01 10:49 AM
Joined: Feb 2001
Posts: 62
M
Mike Offline OP
Member
I read the post about parallel grounding conductors again. The electrician said the utility was going to pull an equipment grounding conductor from the transformer to the 2000 amp service equipment. The post didn't say if the EGC and grounded conductor are physically the same size. Is that a code violation? [Linked Image]

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