3A Electrical Practice Test

3A ELECTRICAL PRACTICE

TEST

Question 1: What is the maximum continuous load permitted on an 80A overcurrent

device, assuming it is not rated for 100% continuous operation?

Choices:

1) 40A

2) 64A

3) 80A

4) 100A

Correct Answer: 64A

Explanation: Under NEC standard requirements, an overcurrent protection device should not be loaded to more than 80% of its rating for continuous loads. 80A x 0.80 = 64A.Page 1

Question 2: According to the NEC, what is the minimum bending radius for a power cable with an overall diameter of 1 inch (not shielded)?

Choices:

1) 4 inches 2) 5 inches 3) 8 inches 4) 12 inches

Correct Answer: 5 inches

Explanation: For non-shielded power cables up to 1000V, the minimum bending radius is typically 5 times the overall diameter of the cable (NEC 330.24).Question 3: In a dwelling unit garage, GFCI protection for 15- and 20-ampere, 125-

volt receptacles is required for:

Choices:

1) All receptacles.2) All receptacles EXCEPT those supplying �re alarms.3) All receptacles EXCEPT those for garage door openers.4) All receptacles EXCEPT single receptacles for dedicated equipment.

Correct Answer: All receptacles.

Explanation: According to modern NEC (210.8(A)), all 125-volt, single-phase, 15- and 20- ampere receptacles installed in garages and accessory buildings must have GFCI protection, with no exceptions for dedicated equipment or garage door openers.Page 2

Question 4: Which National Electrical Code article primarily covers telephone,

telegraph, and outside wiring for �re and burglar alarm systems?

Choices:

1) Article 500 2) Article 600 3) Article 700 4) Article 800

Correct Answer: Article 800

Explanation: NEC Article 800 covers general requirements for communications circuits, including telephone and similar signaling systems.

Question 5: What is the minimum working space depth in front of electrical

equipment operating at volts to ground with exposed live parts on one side and no live or grounded parts on the other?

Choices:

1) 3 feet 2) 3.5 feet 3) 4 feet 4) 5 feet

Correct Answer: 3 feet

Explanation: NEC Table 110.26(A) Condition 1 speci�es a minimum working space depth of 3 feet for installations operating at 0-150 volts to ground.Page 3