CME Special Occupancies and Equipment 2

Question 1

In a Class II, Division 1 location involving combustible dust, what type of enclosure is required for electrical equipment?

Accepted Answer

Dust-ignitionproof

Answer

Weatherproof

Answer

Explosionproof

Answer

Rainproof

Question 2

Under NEC Article 517, the critical branch of a hospital's essential electrical system must restore power within how many seconds of interruption?

Accepted Answer

10 seconds

Answer

5 seconds

Answer

30 seconds

Answer

60 seconds

Question 3

Class III hazardous locations are characterized by the presence of:

Accepted Answer

Ignitable fibers or flyings

Answer

Flammable gases or vapors

Answer

Combustible dust

Answer

Explosive chemical compounds

Question 4

Under the NEC Article 505 Zone system, equipment used in a Zone 0 location must be classified as:

Accepted Answer

Category 1

Answer

Category 2

Answer

Category 3

Answer

Zone-rated only

Question 5

NEC 517.20 requires what protection for receptacles and fixed equipment in wet procedure locations of healthcare facilities?

Accepted Answer

Isolated power system or GFCI protection

Answer

AFCI protection only

Answer

Double-insulated equipment exclusively

Answer

Explosionproof outlets

Question 6

In a Class I, Division 2 location, general-purpose enclosures are acceptable for which type of equipment?

Accepted Answer

Motors that do not have arc-producing devices

Answer

Switches that interrupt current under load

Answer

All electrical equipment without restriction

Answer

Fuses rated over 600 volts

Question 7

Per NEC 501.15, the sealing compound used to fill conduit seals in Class I hazardous locations must be:

Accepted Answer

A compound listed for the purpose

Answer

Portland cement mixed with sand

Answer

Any UL-listed caulk

Answer

Epoxy resin rated for 600V