Seperate neutrals for every circuit?!

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Only one set of specs... well... one for base building, and one for each of the 3 different tennant packages. New construction so there are no pre-existing standards other than the specs and code.
 
This will be come the norm.

This will be come the norm.

IMO this installation practice of individual neutrals will be come the normal practice in all installations. Just the change in the code about MWBC will help drive this.

Rick
 
jdsmith said:
There are a few things in my plant that the regular contractors "just know" - no 1-1/4" conduit
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What's wrong with 1-1/4?

I can understand the reasoning behind no 1/2" pvc or rigid, that pipe is so small it's practically worthless...:roll:
 
MO this is a typical install for the isolation of harmonics to prevent ground loops in a audio application. On top of that all the circuits pertaining to the audio would also be on the same phase. You then use the remaining phases for "dirty power"
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Ground "LOOPS" are prevented from not having neutrals grounded downstream from the main service neutral bond or SDS main bond and has nothing to do with harmonics in ground loops.

As for being on the same phase WHY? What does this buy you?

The main issue in my experience is engineers feel due to some evidence and some good sales this minimizes triplen additive currents in the neutral on multi-wire branch circuits. Plus minimizes over voltage from an open neutral.
 
I am curious, maybe I read this too fast, but is there going to be some kind of ampacity adjustments necessary, depending on the number of conductors? If you are going to use separate grounded conductors, they will be considered as CCC.
 
I was in a prominent highrise in Los Angeles and happened to see an open panel while some TI's were being done. The panel looked to be from the late 70s or early 80s and belonged to a bank. Pretty cool install, it was full of 20a 120v circuits with #10 stranded, neutral per circuit. The neutrals had a black, red, and blue spiral on them to itentify which phase they went with. All the wiring was laced together in the panel. Wish i had a pic
 
wireguru said:
I was in a prominent highrise in Los Angeles and happened to see an open panel while some TI's were being done. The panel looked to be from the late 70s or early 80s and belonged to a bank. Pretty cool install, it was full of 20a 120v circuits with #10 stranded, neutral per circuit. The neutrals had a black, red, and blue spiral on them to itentify which phase they went with. All the wiring was laced together in the panel. Wish i had a pic
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That sounds like a premade harness. They are still available and can be made to any spec including custom labeling on each conductor. I don't know of a company to link to however. :confused:
 
peter d said:
That sounds like a premade harness. They are still available and can be made to any spec including custom labeling on each conductor. I don't know of a company to link to however. :confused:
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no these were the branch circuit conductors coming out of conduits into the panel and onto the breakers, neutral and ground bars
 
Cow said:
What's wrong with 1-1/4?

I can understand the reasoning behind no 1/2" pvc or rigid, that pipe is so small it's practically worthless...:roll:
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I don't know if there's a good reason for this one - probably along the lines of "our parts bin where we keep the couplings only has 6 spots, I guess we'll just stock 3/4, 1, 1-1/2, 2, 3, 4 and only use those sizes." Or it was an attempt to standardize to keep fewer parts around to save money, but it's hard to see how that would matter. For certain things, stanchion mount hazardous location lights being one example, 1-1/4" works fine and the cost savings over 1-1/2" adds up after a while.
 
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