E2 Plan Review and Inspections 4

Question 1

A commercial electrical inspection reveals that conductors in a cable tray are not secured at the ends of the tray and at each section connector. Which NEC article applies to cable tray wiring support requirements?

Accepted Answer

NEC Article 392, which governs cable tray systems including support and installation requirements

Answer

NEC Article 392 governs cable tray installation, including requirements for securing cables at the ends and transitions.

Question 2

During a plan review for a new commercial building, the engineer's load calculations show a demand factor applied to the lighting load. Under what NEC section is a demand factor permitted for commercial lighting?

Accepted Answer

NEC 220.42, which permits demand factors for lighting loads in specific occupancy types based on Table 220.42

Answer

NEC 220.42 and Table 220.42 permit demand factors for lighting loads in commercial occupancies such as stores, hospitals, and hotels.

Question 3

An inspector is performing a final inspection on a commercial kitchen. The plans show a 6-foot metal countertop that is not bonded to the electrical system. What should the inspector require?

Accepted Answer

Verify whether the countertop is within 6 feet of a sink and if so, require bonding per NEC 250.104 or applicable plumbing/equipment bonding requirements

Answer

In commercial kitchens, metal surfaces near plumbing or electrical equipment may require bonding to prevent shock hazards per NEC 250.104 and related sections.

Question 4

A plan review for a commercial parking garage shows lighting circuits without GFCI protection. Under which condition does the NEC require GFCI for lighting in a commercial parking structure?

Accepted Answer

GFCI protection is only required for receptacles in parking garages, not lighting circuits

Answer

NEC 210.8(B) requires GFCI protection for receptacles in commercial garages, but lighting circuits are governed by different requirements; the inspector should verify applicability.

Question 5

During a service inspection, the inspector finds that the neutral conductor at the service entrance is connected to the grounding electrode system and also bonded to the equipment grounding bus in a downstream distribution panel. What is wrong with this installation?

Accepted Answer

This creates a parallel neutral path (objectionable current) and violates NEC 250.6; the neutral-ground bond must only occur at the service equipment

Answer

NEC 250.6 prohibits objectionable current on grounding conductors; the neutral-to-ground bond must occur only at the service disconnect, not at downstream panels.

(E2) E2 Commercial Electrical Inspector Practice Test

(E2) E2 Commercial Electrical Inspector Practice Test

E2 Plan Review and Inspections 4