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2. Circuit breaker - Wikipedia

   en.wikipedia.org/wiki/Circuit_breaker

   Three-pole common-trip breaker for supplying a three-phase device. This breaker has a 2 A rating. To provide simultaneous breaking on multiple circuits from a fault on any one, circuit breakers may be made as a ganged assembly. This is a very common requirement for three-phase systems, where breaking may be either three- or four-pole (solid or ...

3. Distribution board - Wikipedia

   en.wikipedia.org/wiki/Distribution_board

   In a U.S.-style board, breaker positions are numbered left-to-right, along each row from top to bottom. This numbering system is universal with numerous competitive manufacturers of breaker panels. 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 ...

4. Three-phase electric power - Wikipedia

   en.wikipedia.org/wiki/Three-phase_electric_power

   A three-phase motor is more compact and less costly than a single-phase motor of the same voltage class and rating, and single-phase AC motors above 10 hp (7.5 kW) are uncommon. Three-phase motors also vibrate less and hence last longer than single-phase motors of the same power used under the same conditions. [32]

5. Electrical wiring in the United Kingdom - Wikipedia

   en.wikipedia.org/wiki/Electrical_wiring_in_the...

   A three or four-pole isolator or circuit breaker is used for three-phase loads, for devices with both permanent and switched supplies (such as bathroom extractor fans) and also at the distribution board to isolate all the phases. A three-phase installation with a TT earthing system is an example where four-pole devices would be required.

6. Fuse cutout - Wikipedia

   en.wikipedia.org/wiki/Fuse_cutout

   Linemen from Huntsville Utilities replace a blown cutout fuse with a non-conductive extending pole tool on July 10th, 2022 in Huntsville, Alabama. Each fuse holder typically has an attached pull ring that can be engaged by a hook at the end of a fiberglass hot stick operated by a lineworker standing on the ground or from a bucket truck , to ...

7. High-leg delta - Wikipedia

   en.wikipedia.org/wiki/High-leg_delta

   Even when unmarked, it is generally easy to identify this type of system, because the B phase (circuits #3 and #4) and every third circuit afterwards will be either a three-pole breaker or a blank. Current practice is to give separate services for single-phase and three-phase loads, e.g., 120 V split-phase (lighting etc.) and 240 V to 600 V ...