Wiring 3 Receptacles

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mstrlucky74

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I've zoomed in pic a lot so hope you can see. Just curious here. If this was an EMT job and you had three receptacles each on a separate circuit could you run a ONE pipe down the wall containing the 3 circuits then run horizontal hitting each of the three receptacles? That's how I'd figure it. You wouldn't run three separate pipe vertically to a box in the ceiling would you? That seems wasteful. Thanks.
 

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I would connect them together in the wall. Makes no sense to run three individual stubs up into the ceiling and connect them there. With 6 CCC's there will be no derating issues.

We did do a job once where they wanted no horizontal conduit in the walls and it said so in the spec. Seems that they were constantly re-configuring doors and walls and didn't want to have to disconnect, remove and replace the horizontal conduits.
 
infinity said:
I would connect them together in the wall. Makes no sense to run three individual stubs up into the ceiling and connect them there. With 6 CCC's there will be no derating issues.

We did do a job once where they wanted no horizontal conduit in the walls and it said so in the spec. Seems that they were constantly re-configuring doors and walls and didn't want to have to disconnect, remove and replace the horizontal conduits.
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Thought so. Thanks....and interesting about no horz. conduits. So derating is when you have MORE than 3 CCC's, correct? These receptacles require separate neutrals, I guess those are not considered CCC's?
 
mstrlucky74 said:
Thought so. Thanks....and interesting about no horz. conduits. So derating is when you have MORE than 3 CCC's, correct? These receptacles require separate neutrals, I guess those are not considered CCC's?
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No it's 6 CCC's as I stated, 3H+3N = 6 CCC's.

#12 THHN= 30 amps*80%(4-6 CCC's) = 24 amps after adjustment. :)
 
If you had 3 hots and one neutral, assuming 3 phase, then you would not count the neutral if the loads were linear.
 
mstrlucky74 said:
Thanks. So you use the 90 degree column when finding the ampacities?
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Yes, if it's a 90° C conductor (i.e-THHN) then you can use the 90° ampacity for derating purposes. Since you stated that you have separate neutrals you end up with 6 CCC's. Nice job on the graphic is was easy to read. :cool:
 
If these were all the same circuit would that change your approach for connecting all three with one conduit? Would the there be any issued splicing in the boxes? Box fill? Just thinking....:dunce::?
 
mstrlucky74 said:
If these were all the same circuit would that change your approach for connecting all three with one conduit? Would the there be any issued splicing in the boxes? Box fill? Just thinking....:dunce::?
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With the number of conductors required for either scenario, then no. Just ensure that the box is the proper size.
 
I must have missed which one this is. And were the separate neutrals required?

If this is 3-phase, you could use a single 12/4 cable to the first box, right? 12/3 to the second, 12/2 to the third...

If this is single-phase, would a 12/4 "super-neutral" be allowed to the first box? It's been a long time since I used that.
 
MAC702 said:
I must have missed which one this is. And were the separate neutrals required?

If this is 3-phase, you could use a single 12/4 cable to the first box, right? 12/3 to the second, 12/2 to the third...

If this is single-phase, would a 12/4 "super-neutral" be allowed to the first box? It's been a long time since I used that.
Click to expand...

Looking back I believe that you're correct I don't see a requirement in MstrLuckys post to suggest that there must be separate neutrals.
 
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