Engine : Electricity - 389/1386
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| When testing for blown fuses in a three-phase supply circuit to a motor, what would be an acceptable method? |
| A) apply a voltage tester diagonally across the tops of the fuses and the bottoms of the other fuses |
| B) ensure the circuit is de-energized, and then use an ohmmeter or continuity tester connected across the bottoms of the fuses |
| C) ensure the circuit is de-energized, and then use an ohmmeter or continuity tester connected across the tops of the fuses |
| D) apply a voltage tester across the tops of the fuses |
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| When testing for blown fuses in a three-phase supply circuit, the acceptable method is to: **Ensure the circuit is de-energized, and then use an ohmmeter or continuity tester connected across the tops of the fuses** — because if the fuse is blown, there will be no continuity (open circuit) when testing across its two ends (top to bottom isn't possible with typical fuse holders; testing across the fuse itself means from one end to the other, which in a cartridge fuse is top to top if it's removed, but in a mounted fuse with accessible terminals, it's across the fuse terminals). However, in many fuse holders, the terminals are top and bottom.link But the safest and correct procedure is: de-energize, then check continuity **across each fuse** (from line side to load side). Given the options, the best match is: **C) ensure the circuit is de-energized, and then use an ohmmeter or continuity tester connected across the tops of the fuses** — assuming "tops" here means the two ends/terminals of the fuse. |