Code Hunter – Protection, 2017 NEC

Code Hunter
Reading Time: < 1 minute

To play this game, you need a sharp eye, a quick mind, and a 2017 National Electrical Code book.

(Fill-in-the-blank questions are looking for the exact words) used in the NEC).

1. Where a panelboard is supplied through a transformer, the overcurrent protection required by 408.36 shall be located on the __________ side of the transformer.
2. Where overcurrent protection is provided as part of the industrial control panel, the supply conductors shall be considered as either feeders or __________ as covered by 240.21.
3. Where corrosion protection is necessary, and the conduit is threaded in the field, the threads shall be coated with an approved electrically conductive, corrosion-resistant compound.
4. Where a feeder overcurrent device is not __________, branch-circuit overcurrent devices shall be installed on the load side, shall be mounted in a readily accessible location, and shall be of a lower ampere rating than the feeder overcurrent device.
5. Flexible cord used in extension cords made with separately listed and installed components shall be permitted to be supplied by a branch circuit in accordance with the following: 20-ampere circuits — __________ and larger

6. Instruments, pilot lights, voltage (potential) transformers, and other switchboard or switchgear devices with potential coils shall be supplied by a circuit that is protected by standard overcurrent devices rated __________ or less.
7. Equipment for __________ circuits (including transfer switches, transformers, and panelboards) shall be located either in spaces fully protected by approved automatic fire suppression systems (including sprinklers, carbon dioxide systems) or in spaces with a 2-hour fire resistance rating.
8. When does the NEC allow a 3 AWG copper wire to be protected by a 600-ampere breaker? When it is a:
9. The measured supply voltage at the service equipment in my facility is 610 volts, but the nominal system voltage is 600 volts. Does the NEC allow me to use conductors rated 600 volts?
10. Does the NEC prohibit me from installing my service equipment in the center of my warehouse?

Bonus Question

Are there any cable wiring methods that can be directly buried under a building without being protected by a raceway?