Licensed Electrical Contractor Licensed Electrical Contractor Special Occupancies and Equipment Questions and Answers 3

Question 1

In a patient care area of a healthcare facility, what is the maximum impedance permitted for the equipment grounding path from a receptacle to the grounding bus of the panel?

Accepted Answer

0.1 ohm

Answer

NEC 517.13 and testing standards require the grounding path impedance in patient care vicinities not to exceed 0.1 ohm to protect patients from electric shock.

Question 2

What type of seal is required where a conduit passes from a Class I, Division 2 location into an unclassified area?

Accepted Answer

A conduit seal fitting within 18 inches of the boundary

Answer

NEC 501.15(B)(2) requires a conduit seal within 18 inches of the boundary where conduit leaves a Class I, Division 2 area and enters an unclassified space.

Question 3

Per NEC Article 625, what is the minimum branch circuit rating required for a Level 2 electric vehicle charging station rated at 32 amps continuous?

Accepted Answer

40 amperes

Answer

Continuous loads must be sized at 125% of the load current, so 32A x 1.25 = 40A minimum branch circuit rating per NEC 625.41.

Question 4

Which of the following areas is classified as a Class I, Zone 0 hazardous location?

Accepted Answer

The interior of a closed process vessel containing flammable liquid under normal conditions

Answer

Zone 0 is defined as an area where ignitable concentrations of flammable gases or vapors exist continuously or for long periods, such as inside a closed process vessel.

Question 5

When installing a hot tub outdoors, what is the minimum distance that a 15- or 20-ampere receptacle must be located from the inside wall of the hot tub?

Accepted Answer

6 feet

Answer

NEC 680.43(A) requires 15- and 20-ampere receptacles to be located at least 6 feet from the inside walls of a hot tub.

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Licensed Electrical Contractor Licensed Electrical Contractor Special Occupancies and Equipment Questions and Answers 3