number of CCC in conduit

[kwired]

the pull box is a absolute mess. According to your calculations you are saying that all those wires could fit into a 8x8x8 pull box which is 512 ci. I did not even look at the table but I find it hard to believe that the NEC is saying
that 210 conductors ( 84 0f them being #10s) can enter and splice to one another and this leaves a safe work men like installation. And if the NEC is stating this to be true than they are horribly mistaken as to the space required to accomplish this task.

I think 18x18 has sufficient room, but certainly would hate to work in there if you are going to "wire nut" all 210 of those.

I would be mounting some terminal blocks in there instead of wire nutting everything. Maybe double tier din rail style, grounded and ungrounded of each circuit on each block.

 

[jumper]

Here's an 18X18 with about 2,000,000 conductors.

Yes, but since all EGCs only count as one for box fill, I believe one could safely use 1.5 million for the calcs.

Great googely moogely that must have been a PITA to do.

 

[infinity]

Yes, but since all EGCs only count as one for box fill, I believe one could safely use 1.5 million for the calcs.

Great googely moogely that must have been a PITA to do.

IMO a very poor design. The box had at least 20-1" EMT's and numerous 12/2 MC cables but was still within the proper box fill (that's the reason I posted it). I still remember the guy splicing it all out telling me that he liked a challenge.

 

[drktmplr12]

IMO a very poor design. The box had at least 20-1" EMT's and numerous 12/2 MC cables but was still within the proper box fill (that's the reason I posted it). I still remember the guy splicing it all out telling me that he liked a challenge.

i wonder if the next guy that had to work in the box felt the same way?

oh by the way i need you to pull 6 new circuits through there, can you re-do the calc? oh they don't know how many CCC's are in there? better count to be sure.. :slaphead:

 

[AKElectrician]

the conductors are all slated to be terminated on 20A circuit breakers and there is no deviating from that. If it passes inspection it will only be because the inspector does not pick up on the violation but certainly not because
the installation is correct.
Its actually a 42 circuit panel and he putting 21 hot legs and 21 neutrals in each 2" conduit, for a total of 42 circuits.
On top of this violation, all 84- #10 HRs are in a 18x18x6 pullbox where up to 42 - #12 guage MC cables will enter as the field branch circuits.
So the pull box will have 84- #10s and 126- # 12 conductors.
Not 100% positive but I don't think 210 conductors being aloud in a 18x18x6 pull box.

Sounds like you got a pickle on nickel hill, that'll cost someone a pretty dime and whole lotta time….

 

[florida-sparkey]

one of the guys on the job are installing 42- #10 current carrying conductors in a 2" conduit.
I checked into it and according to table 310.15 (B 3 a) which is the adjustment factors table, it reads that above 40 current carrying conductors must be reduced by 35% of its original ampicity.
According to table 310.15 ( B 16 ) a #10 THHN has a max ampicity of 40a, after reducing to 35% the #10 now has a ampicity of only 14A. These conductors are slated to be terminated on 20A circuit breakers.
I certainly see his installation as a violation.

Am I correct on this or am I misunderstanding the tables and the adjustment methods.

- Are the conduits less than 24 inches long? If so it is a nipple and derating is not necessary at all.