Journeyman Electrician’s Exam Journeyman Electrician's Panelboards and Switchboards

Question 1

Per NEC 408.4, every circuit and circuit modification must be legibly identified in a circuit directory. Where must this directory be located?

Accepted Answer

On the inside of the panelboard door or inside the panelboard enclosure

Answer

On the exterior of the building near the main disconnect

Answer

At the electrical service entrance equipment only

Answer

Posted on the load side of the main breaker

Question 2

According to NEC 408.15, a lighting and appliance branch-circuit panelboard is defined as one having more than what percentage of its overcurrent devices rated 30 amperes or less for which neutral connections are provided?

Accepted Answer

10 percent

Answer

25 percent

Answer

50 percent

Answer

75 percent

Question 3

What is the maximum number of overcurrent devices permitted in a single lighting and appliance branch-circuit panelboard per NEC 408.15?

Accepted Answer

42 overcurrent devices

Answer

30 overcurrent devices

Answer

60 overcurrent devices

Answer

No limit is specified

Question 4

Per NEC 408.36, a panelboard must be protected by an overcurrent protective device having a rating not greater than which of the following?

Accepted Answer

The rating of the panelboard

Answer

125% of the panelboard rating

Answer

The rating of the largest branch circuit breaker in the panel

Answer

The calculated load plus 20% safety factor

Question 5

Per NEC 408.36(D), a back-fed circuit breaker used as the supply overcurrent protective device for a panelboard must be:

Accepted Answer

Secured in place by an additional fastener that requires other than a pull to release

Answer

Rated at 150% of the calculated load

Answer

Installed with a lockout device on the breaker handle

Answer

Replaced with a main lug only assembly

Question 6

What is the minimum clearance required in front of a panelboard with exposed live parts on one side only (Condition 1) per NEC 110.26(A)(1)?

Accepted Answer

36 inches

Answer

30 inches

Answer

42 inches

Answer

48 inches

Question 7

Per NEC 110.26(A)(3), what is the minimum headroom required in working spaces for electrical equipment rated 600V or less?

Accepted Answer

6½ feet (78 inches)

Answer

6 feet (72 inches)

Answer

7 feet (84 inches)

Answer

5½ feet (66 inches)