IEC Special Occupancies and Equipment 4

Question 1

A receptacle installed within 6 feet of a hydromassage bathtub must be protected by:

Accepted Answer

GFCI protection

Answer

NEC 680.74 requires all receptacles within 6 feet of a hydromassage bathtub to be GFCI protected.

Question 2

What is the maximum voltage permitted for underwater pool lighting in a wet-niche fixture?

Accepted Answer

30 volts

Answer

NEC 680.23(A)(4) permits wet-niche luminaires to operate at no more than 150 volts between conductors, but the practical limit for underwater fixtures is 30 volts.

Question 3

In a Class I, Division 2 location, which of the following is NOT required to be explosion-proof?

Accepted Answer

General-purpose motors that won't arc normally

Answer

In Division 2 locations, motors that are not normally arcing and are totally enclosed may be used without explosion-proof listing, unlike Division 1.

Question 4

Mobile home parks must provide each lot with at least a minimum electrical service of:

Accepted Answer

50-ampere, 120/240-volt

Answer

NEC 550.30 requires each mobile home lot to be supplied with a minimum 50-ampere, 120/240-volt service.

Question 5

For a grain storage elevator, the area within 3 feet of any opening in a belt or bucket elevator housing is classified as:

Accepted Answer

Class II, Division 1

Answer

NEC 511.3 Table defines the area within 3 feet of openings in grain elevator housings as Class II, Division 1 due to constant grain dust presence.

IEC - Independent Electrical Contractors Practice Test

IEC - Independent Electrical Contractors Practice Test

IEC Special Occupancies and Equipment 4