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EPISODE 10 — 265.18
EPISODE 10 — 265.18
Branch-Circuit Rating
Branch-Circuit Rating
SLIDE 1 — 265.18
SLIDE 1 — 265.18
BRANCH-CIRCUIT RATING
A branch circuit covered by Article 265 is rated according to the:
MAXIMUM PERMITTED AMPERAGE RATING OR SETTING OF THE OCPD.
That's the number you need to pay attention to.
SLIDE 2 — BIG EXAM POINT
SLIDE 2 — BIG EXAM POINT
What if you install conductors with higher ampacity than required?
Does that automatically increase the branch-circuit rating?
NO.
265.18 says the rating or setting of the specified OCPD determines the circuit rating.
THINK:
THINK:
CONDUCTOR AMPACITY ≠ AUTOMATIC CIRCUIT RATING
SLIDE 3 — REVIEW ⚡
SLIDE 3 — REVIEW ⚡
A branch circuit has conductors capable of carrying more current than the installed OCPD.
What determines the branch-circuit rating?
A. Conductor size alone
B. Raceway size
C. OCPD rating or setting
D. Equipment grounding conductor size
ANSWER: C
⚠️ Educational NoticeQuick Hits are educational explanations based on my understanding of the NEC. Always verify requirements in the current adopted NEC, applicable local amendments, manufacturer instructions, and with the AHJ.
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