CEP Installation & Maintenance Practices 2

Question 1

When installing conduit through a fire-rated wall, what is required to maintain the fire rating?

Accepted Answer

Use a listed firestop system to seal the penetration

Answer

NEC 300.21 requires listed firestop systems to be used at conduit penetrations through fire-rated assemblies to prevent fire and smoke spread.

Question 2

What is the minimum bending radius for a 2-inch rigid metal conduit (RMC) based on NEC Table 344.24?

Accepted Answer

10 inches

Answer

NEC Table 344.24 specifies a minimum bending radius of 10 inches (to the inner edge) for 2-inch RMC.

Question 3

During routine maintenance, a technician finds a neutral conductor that is discolored and brittle at a connection point. What is the MOST likely cause?

Accepted Answer

Loose connection causing resistive heating

Answer

A loose neutral connection creates high resistance at the joint, causing localized resistive heating that chars and embrittles insulation over time.

Question 4

What does NEC 210.52 require regarding receptacle spacing in residential habitable rooms?

Accepted Answer

A receptacle must be within 6 feet of any point along the floor line

Answer

NEC 210.52(A) requires that no point along the floor line is more than 6 feet from a receptacle outlet, measured horizontally.

Question 5

When pulling wire through conduit, what is the maximum percent fill allowed for a conduit containing 3 or more conductors?

Accepted Answer

31%

Answer

NEC Chapter 9, Table 1 limits conduit fill to 40% for two conductors and 31% for three or more conductors.

(CEP) Certified Electrical Professional Practice Test

(CEP) Certified Electrical Professional Practice Test

CEP Installation & Maintenance Practices 2