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[2] As a result, numerous unsafe situations have resulted where panels were dangerously overloaded because these non-CTL breakers continue to be used. [citation needed] With the use of non-CTL breakers, panels can be configured with the total number of circuits in excess of the designed capacity of that panel.
Each row is fed from a different line (A, B, and C below), to allow 2- or 3-pole common-trip breakers to have one pole on each phase. In North America, it is common to wire large permanently installed equipment line-to-line. This takes two slots in the panel (two-pole) and gives a voltage of 240 V for split-phase electric power, or 208 V for ...
A residual-current device (RCD), residual-current circuit breaker (RCCB) or ground fault circuit interrupter (GFCI) [a] is an electrical safety device, more specifically a form of Earth-leakage circuit breaker, that interrupts an electrical circuit when the current passing through line and neutral conductors of a circuit is not equal (the term residual relating to the imbalance), therefore ...
Three-pole common-trip breakers are typically used to supply three-phase power to powerful motors or further distribution boards. Separate circuit breakers must never be used for live and neutral, because if the neutral is disconnected while the live conductor stays connected, a very dangerous condition arises: the circuit appears de-energized ...
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