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 300, which covers general wiring methods and only applies to conduit

Answer

NEC Article 358, which addresses electrical metallic tubing

Answer

NEC Article 250, which governs grounding and bonding requirements

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 220.14, which requires all lighting receptacles to be calculated at full load

Answer

NEC 230.42, which addresses service entrance conductor sizing

Answer

Demand factors are never permitted for lighting in commercial buildings

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

No action is needed since only equipment with electrical connections requires bonding

Answer

Require grounding of the countertop only if it is adjacent to a 208V receptacle

Answer

Metal countertops only need bonding in dwelling units, not commercial kitchens

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

GFCI is required for all 120V lighting circuits in parking structures per NEC 210.8(B)

Answer

GFCI is required only for lighting circuits that are accessible from the parking level

Answer

All lighting in parking structures must be on dedicated AFCI circuits

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

Nothing is wrong; grounding the neutral at multiple points improves safety

Answer

The downstream bond is permitted if the panel is in a separate building

Answer

The grounding electrode connection should be removed from the service entrance instead

Question 6

An inspector reviewing plans for a commercial data center notices that the UPS bypass panel is not shown with a clear identification label on the drawings. What should the inspector require?

Accepted Answer

Require the plans to show labeling requirements for all emergency and bypass equipment per NEC 700.9 and 705.10

Answer

Labels are only required in the field, not on drawings

Answer

Labeling is the responsibility of the equipment manufacturer, not the electrical contractor

Answer

Approve the plans and require labels only at the final inspection

Question 7

When performing a rough-in inspection of a multi-story commercial building, the inspector finds that fire-rated floor penetrations for conduit are not sealed. Which code authority governs this requirement?

Accepted Answer

NEC 300.21, which requires fire-rated penetrations to be sealed to prevent the spread of fire and products of combustion

Answer

NEC 358.30, which governs EMT support requirements at penetrations

Answer

This is solely a fire code requirement and outside the electrical inspector's scope

Answer

NEC 230.54, which addresses service entrance sealing at weather heads