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multiconductor cable derating | Mike Holt's Forum
https://forums.mikeholt.com/threads/multiconductor-cable-derating.62082/
De-Rating when multiple conductors in raceway - Mike …
https://forums.mikeholt.com/threads/de-rating-when-multiple-conductors-in-raceway-conduit-size.71578/
Shepherdstown, WV. Jan 13, 2010. #1. NEC Table 316 (B) (2) (a) requires de-rating the ampacity of the conductors when more than three current-carrying conductors are in a raceway. I had a specific situation that sparked a discussion. I had #12 THHN in 1" conduit with a 20 amp. breaker. 40% fill says you could have 26 wires but the above table ...
Sizing Circular Raceways for Multiconductor Cables - Explained!
https://www.electricalcodeacademy.net/post/sizing-circular-raceways-for-multiconductor-cables-explained
From time to time we get asked how to size a raceway where SE-R Cable is to be installed and how do we calculate the raceway fill requirements found in Chapter 9, Table 1 of the 2017 NEC®. ... Table 1 of the 2017 NEC®. Determining the raceway fill for a complete raceway system (not for protection from physical damage) where Type SE-R Cable is ...
Sizing Circular Raceways for Multiconductor Cables
https://masterthenec.blogspot.com/2016/12/sizing-circular-raceways-for.html
Once you have selected the raceway method you are installing, scroll over to the 53% fill column and find a raceway that will handle the 1.5948 in², which if the raceway was PVC Schedule 40 would result in a trade size 2 conduit. Again the benefit here is that the cable is considered a single conductor and can utilize the fill all the way to 53%.
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