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Where Do Breakers Go? Nadanka/iStock/Thinkstock

Where Do Breakers Go?

We define a circuit by its breaker [110.22], but there are exceptions to this.

When you install a fuse or circuit breaker, you must install it at the point where the conductors receive their supply [240.21]. Because this rule exists, we define a circuit by its breaker [110.22]. But there are exceptions to this, and those are listed in Sec. 240.21(A) through (H). This list takes up nearly three pages, so bears some explanation.

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