CEA Wiring Methods & Installation Practices 4

Question 1

When installing conduit through fire-rated walls or floors, what is required?

Accepted Answer

Fire-stop material approved for the application must seal the penetration

Answer

All conduit penetrations through fire-rated assemblies must be sealed with approved fire-stop materials to maintain the fire rating of the assembly.

Question 2

What is the maximum allowable voltage for conductors installed in the same raceway using NM cable?

Accepted Answer

600V

Answer

Type NM cable conductors are rated at 600V, which is the standard voltage rating for most branch circuit wiring methods in residential construction.

Question 3

When must a conduit body (LB, LL, LR) be sized to accommodate the conductors inside it?

Accepted Answer

Only when used as a pull point with conductors larger than 6 AWG

Answer

Conduit bodies used with conductors larger than 6 AWG must have a cross-sectional area of at least twice the cross-section of the largest conduit connected to it.

Question 4

Flexible metal conduit (FMC) is permitted to serve as the equipment grounding conductor if it meets which condition?

Accepted Answer

FMC up to 6 feet long in circuits not exceeding 20A at 250V or less

Answer

FMC can serve as the EGC when the total length does not exceed 6 feet, the circuit does not exceed 20 amperes, and the circuit voltage is 250V or less.

Question 5

What is the minimum insulation rating required for conductors installed in a raceway exposed to direct sunlight on a rooftop?

Accepted Answer

90°C (194°F)

Answer

Conductors in raceways exposed to direct sunlight on rooftops must have a 90°C insulation rating and may require ampacity correction for elevated ambient temperatures.

(CEA) Certified Electrical Apprentice Practice Test

(CEA) Certified Electrical Apprentice Practice Test

CEA Wiring Methods & Installation Practices 4