E2 Commercial Electrical Inspector Plan Review and Inspections

Question 1

What is the primary purpose of reviewing electrical blueprints during plan review?

Accepted Answer

To verify compliance with applicable codes and standards

Answer

The primary role of an electrical inspector during plan review is to ensure public safety and adherence to legal requirements. By meticulously reviewing electrical blueprints, inspectors can identify potential code violations, such as incorrect wiring methods, undersized components, or improper clearances, before construction begins. This proactive approach prevents costly rework, reduces safety hazards, and ensures the final installation will meet the National Electrical Code (NEC) and local regulations.

Question 2

When reviewing plans, you notice that a feeder is undersized for the load it is serving. What is the correct action?

Accepted Answer

Reject the plans and request corrections

Answer

An undersized feeder poses a significant safety hazard, as it can lead to overheating, fire, and equipment damage due to excessive current draw. As an electrical inspector, your duty is to ensure all designs comply with the National Electrical Code (NEC) and safety standards. Approving such a plan, even with a note, would be a dereliction of this duty and could result in dangerous installations.

Question 3

During an inspection, you find a disconnect switch installed higher than 6 feet 7 inches above the floor. What should you do?

Accepted Answer

Require the switch to be relocated within the acceptable height range

Answer

The National Electrical Code (NEC) specifies maximum heights for disconnect switches and other control devices to ensure they are readily accessible and operable for all personnel, including those with disabilities. A disconnect switch installed higher than 6 feet 7 inches (2.0 m) violates NEC 404.8(A) for switches and circuit breakers. This non-compliance must be corrected to ensure safe and accessible operation of the electrical system.

Question 4

A set of plans shows lighting circuits wired with #14 AWG conductors, protected by a 20-amp circuit breaker. What is the issue?

Accepted Answer

Conductors are undersized for the breaker rating

Answer

According to the National Electrical Code (NEC), #14 AWG copper conductors are typically rated for a maximum overcurrent protection of 15 amps (NEC Table 310.16 and 240.4(D)). Protecting #14 AWG conductors with a 20-amp circuit breaker creates a hazardous situation where the conductors could overheat and potentially cause a fire before the breaker trips. The breaker would not provide adequate protection for the smaller wire size.

Question 5

Which of the following must be verified during the inspection of a completed commercial electrical system?

Accepted Answer

The presence of proper labeling and identification

Answer

Proper labeling and identification of electrical components, such as panelboards, circuit breakers, and disconnect switches, are crucial for safety and maintenance. NEC 110.22 requires clear identification of disconnecting means, and other sections mandate labeling for voltage, current, and purpose. This ensures that personnel can safely operate, troubleshoot, and maintain the system without confusion or risk of injury.

(E2) E2 Commercial Electrical Inspector Practice Test

(E2) E2 Commercial Electrical Inspector Practice Test

E2 Commercial Electrical Inspector Plan Review and Inspections