Electrical Safety and Codes Flashcards

Before working on an EVSE branch circuit, what is the correct way to verify absence of voltage under NFPA 70E?

Answer: Test the meter on a known live source, test the circuit, then retest the meter on the known source

NFPA 70E requires verifying the tester works before and after testing, often called the live-dead-live method.

Which OSHA standard governs lockout/tagout for hazardous energy control in general industry?

Answer: 29 CFR 1910.147

29 CFR 1910.147 is OSHA's Control of Hazardous Energy (lockout/tagout) standard.

Under NFPA 70E, the arc flash boundary is the distance at which incident energy equals what value?

Answer: 1.2 cal/cm²

The arc flash boundary is where incident energy reaches 1.2 cal/cm², the onset of a second-degree burn.

NFPA 70E PPE Category 2 requires arc-rated clothing with a minimum arc rating of what?

Answer: 8 cal/cm²

Category 2 requires a minimum arc rating of 8 cal/cm².

Per NEC Table 300.5, what is the minimum cover depth for Schedule 80 PVC conduit feeding a parking lot EV pedestal (not under a building or roadway)?

Answer: 18 in.

Nonmetallic raceways listed for direct burial need at least 18 in. of cover in general locations.

A bidirectional EVSE that can export power from the vehicle back to the premises wiring must be listed and also meet the requirements of which NEC article?

Answer: Article 705, Interconnected Electric Power Production Sources

NEC 625.48 requires interactive EVSE to be listed for the purpose and comply with Article 705.

Per NEC Chapter 9, Table 1, what is the maximum conduit fill for three or more conductors?

Answer: 40%

Conduit fill for more than two conductors is limited to 40% of the raceway's cross-sectional area.