Installation Best Practices Flashcards

An EVSE manufacturer specifies terminal torque values. Under NEC 110.14(D), how must the installer tighten these connections?

Answer: With an approved means such as a calibrated torque tool

NEC 110.14(D) requires an approved means, such as a calibrated torque tool, when a torque value is specified.

A 48 A continuous-load Level 2 EVSE is being installed. What minimum branch-circuit overcurrent device rating is required?

Answer: 60 A

EVSE is a continuous load, so 48 A × 125% = 60 A minimum overcurrent protection.

What is the recommended maximum voltage drop for an EVSE branch circuit to ensure reasonable efficiency, per the NEC informational note?

Answer: 3%

NEC informational notes recommend no more than 3% drop on a branch circuit and 5% total including the feeder.

An EVSE pedestal is being installed in a parking lot next to a drive aisle. What is the best practice to protect it from vehicle impact?

Answer: Install bollards or wheel stops per the site plan

Bollards or wheel stops physically protect EVSE from vehicle damage where it is exposed to traffic.

Before energizing a newly pulled feeder to a DC fast charger, which test helps confirm conductor insulation was not damaged during the pull?

Answer: Insulation resistance (megohmmeter) test

An insulation resistance test detects insulation damage from pulling before the circuit is energized.

Conduit runs from an underground vault into an EVSE enclosure. What does NEC 300.5(G) require to prevent moisture migration into the equipment?

Answer: The raceway must be sealed or plugged at either or both ends

Raceways entering from underground must be sealed where moisture could contact energized parts.

When multiple EVSE share one feeder, which approach lets the installer avoid a service upgrade while safely limiting total load?

Answer: Installing a listed energy management or load management system

NEC allows a listed energy management system to limit EVSE load so the feeder or service is not overloaded.