EVITP Installation Best Practices 3

Question 1

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

Accepted Answer

With an approved means such as a calibrated torque tool

Answer

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

Question 2

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

Accepted Answer

60 A

Answer

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

Question 3

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

Accepted Answer

3%

Answer

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

Question 4

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?

Accepted Answer

Install bollards or wheel stops per the site plan

Answer

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

Question 5

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

Accepted Answer

Insulation resistance (megohmmeter) test

Answer

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

(EVITP) Electric Vehicle Infrastructure Program Practice Test