E2 Commercial Electrical Inspector Plan Review and Inspections 1 — Questions and Answers
Question 1: What is the primary purpose of reviewing electrical blueprints during plan review?
- To ensure all electrical work is performed within budget
- To verify compliance with applicable codes and standards (Correct answer)
- To ensure faster installation of electrical systems
- To identify the contractors involved in the project
Correct answer: To verify compliance with applicable codes and standards
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?
- Approve the plans but note the issue for the field inspector
- Reject the plans and request corrections (Correct answer)
- Approve the plans if the contractor provides a justification
- Ignore the issue if it is only slightly undersized
Correct answer: Reject the plans and request corrections
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?
- Approve the installation if it’s in a commercial setting
- Require the switch to be relocated within the acceptable height range (Correct answer)
- Test the switch to ensure it works properly
- Request additional documentation from the contractor
Correct answer: Require the switch to be relocated within the acceptable height range
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?
- No issue, this is code-compliant
- Conductors are undersized for the breaker rating (Correct answer)
- The circuit breaker is undersized for the load
- Lighting circuits cannot use #14 AWG conductors
Correct answer: Conductors are undersized for the breaker rating
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?
- The color of the conduit
- The presence of proper labeling and identification (Correct answer)
- The brand of electrical devices used
- The total project cost
Correct answer: The presence of proper labeling and identification
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 Commercial Electrical Inspector Plan Review and Inspections 1
What is the primary purpose of reviewing electrical blueprints during plan review?