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How many current carrying conductors are allowed in a raceway before derating?
Wiki User
∙ 13y ago
You can put three ccc's in a conduit (any size conduit) before you derate. Keep in mind that for single phase loads (lighting, receptacles) the neutral is also counted as a current carrying conductor. This derating factor does not apply to nipples 24 inches long or less. See NEC Table 310.15(B)(2)(a) for full details on derating regarding ccc's.
Wiki User
∙ 15y ago
Wiki User
∙ 13y agoThe answer is 3.
But derating doesn't start with the circuit rating (breaker size). There is often room for more circuits before derating requires any changes to an installation.
For number 12 gauge wire you can have up to 9 current carrying conductors in a raceway before the derating process drops below 20 amps. At 10 and up to 20 current carrying conductors the derating process for 12 gauge wire drops to 15 amps. That's still a very usable circuit rating
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