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animal lover /rat bastard
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16 thhn. other articles apply. table c.1 however, that's fill.

your thread title is "derating", so I'm gonna say 3 current carrying conductors at 100%. 310.15 B 3 A
 

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How many # 10 conductors are allowed in 1" emt?
What kind of insulation? What are the conductors supplying? Any non-coincident loads? Control wiring? What's the ambient temperature? Is it on a rooftop exposed to sunlight?

But I'd say you could cram about 50 of them in there if you really tried :thumbup:
 

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I'd say you could cram about 50 of them in there if you really tried :thumbup:
Yes I'd say any handyman worth his salt could get 50 of them in there, or at least four 10/3 romexes using an SLB or two. The handymen around here are good at putting 10/3 romex in 1/2" pipe with SLBs and elbow "Jakes". When we demo their crap it's so hard to get it out for scrap we just slice the SLBs and Jakes off with a Sawzall.
 

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animal lover /rat bastard
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310.16 #10 ampacity 40 amps for derating purposes

310.15 B 3 A 40amp/20amp = 50% -> 20 conductors max

table c.1 Emt 1" -> 16 thhn #10 max

so at 20 amps, you can put 16 of the #10 thhn in the 1" pipe

(you can do the manual fill calculation also, and see if more will fit - sometimes that's good for a couple more, sometimes not)
 
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