E2 General Requirements and NEC 5

Question 1

Per NEC 110.27, electrical equipment in locations accessible to unqualified persons must be:

Accepted Answer

Guarded by approved enclosures, location elevation, or physical barriers

Answer

NEC 110.27 requires that live parts of electrical equipment operating at 50V or more be guarded against accidental contact by approved enclosures, by location, or by suitable partitions.

Question 2

What does NEC 240.4 require regarding overcurrent protection for conductors?

Accepted Answer

Conductors must be protected at their ampacity or the next standard overcurrent device size up if within certain limits

Answer

NEC 240.4 requires conductors to be protected at their ampacity; however, where the next standard device size is within specific limits (e.g., 800A or less), rounding up to the next standard size is permitted.

Question 3

The NEC requires that all unused openings in electrical enclosures be:

Accepted Answer

Closed using approved fittings or closures

Answer

NEC 110.12(A) requires that all unused openings in enclosures be effectively closed using fittings or closures to maintain the integrity of the enclosure.

Question 4

Per NEC 200.6, which of the following is the correct identification for a grounded (neutral) conductor larger than 6 AWG?

Accepted Answer

White or gray marking at each end or at each accessible location

Answer

NEC 200.6(B) allows conductors larger than 6 AWG to be identified as grounded conductors using white or gray marking at each end and at each accessible location.

Question 5

Under NEC 110.34, what is the minimum depth of working space required for equipment rated over 600V nominal in a commercial installation (Condition 2)?

Accepted Answer

6 feet

Answer

NEC Table 110.34(A) requires a minimum working space depth of 6 feet for Condition 2 (grounded surfaces on one side) for equipment over 600V.

(E2) E2 Commercial Electrical Inspector Practice Test

(E2) E2 Commercial Electrical Inspector Practice Test

E2 General Requirements and NEC 5