Inspection Techniques & Procedures Flashcards

An electrical inspector performing a pre-inspection plan review notices that load calculations are missing from the submitted documents. The inspector should:

Answer: Reject the permit application and require complete documents before scheduling inspection

Complete plan review documentation including load calculations must be approved before field inspections begin to ensure code compliance can be verified.

When inspecting a trench for underground feeder (UF) cable installation, what is the minimum burial depth required in a residential driveway subject to vehicular traffic?

Answer: 24 inches

NEC Table 300.5 requires UF cable under residential driveways to be buried a minimum of 24 inches.

During a commercial kitchen inspection, the inspector notices that the exhaust hood over the cooking equipment has no electrical bonding connection. This is:

Answer: A violation; metal exhaust hoods in commercial kitchens must be bonded to the grounding system

NEC 250.104 and related sections require bonding of metal piping and structural metal that could become energized, including commercial exhaust hoods near electrical equipment.

An inspector is checking the working space clearance in front of a 480-volt switchboard with live parts on one side and a grounded wall on the other. What is the minimum required working depth?

Answer: 4 feet

NEC Table 110.26(A)(1) Condition 2 (live parts on one side, grounded on the other) for over 250V to 600V requires a minimum of 4 feet of working space depth.

When should an electrical inspector call for a re-inspection after a failed inspection?

Answer: After all cited violations have been corrected and the contractor has notified the inspection office

A re-inspection is appropriate only after the contractor has corrected all cited deficiencies and formally notified the inspection office that the work is ready.

An inspector discovers that flexible metal conduit (FMC) has been used for a 10-foot unsupported run between a junction box and a motor. The maximum unsupported length of FMC without a separate support is:

Answer: 4.5 feet

NEC 348.30(A) requires FMC to be secured within 12 inches of each box and at intervals not exceeding 4.5 feet; a 10-foot unsupported run violates this rule.

When inspecting a swimming pool bonding system, which item does NOT need to be bonded together?

Answer: Plastic PVC return fittings embedded in concrete

Non-metallic (PVC) fittings are not conductors and do not require bonding; only metallic components within the bonding perimeter must be bonded.