CEA Conduit Bending and Installation 4

Question 1

When bending a back-to-back (U-bend) in conduit, the second bend must be placed so that:

Accepted Answer

The two 90-degree bends face each other and the legs are parallel

Answer

A back-to-back bend creates a U-shape with two 90-degree bends facing each other, resulting in two parallel vertical legs.

Question 2

According to the NEC, what is the maximum spacing for EMT conduit supports when run horizontally?

Accepted Answer

10 feet

Answer

NEC 358.30 requires EMT to be supported at intervals not exceeding 10 feet for horizontal runs.

Question 3

What is the primary purpose of a conduit expansion coupling?

Accepted Answer

To accommodate thermal expansion and contraction in long runs

Answer

Expansion couplings allow conduit to move axially as it expands and contracts with temperature changes, preventing buckling or stress.

Question 4

When pulling wire through a conduit that has multiple bends, which technique reduces friction?

Accepted Answer

Using wire pulling lubricant (wire lube)

Answer

Wire pulling lubricant significantly reduces friction between conductors and the conduit wall, especially through bends.

Question 5

Which conduit type is NOT permitted for direct burial without concrete encasement?

Accepted Answer

EMT

Answer

EMT is not listed for direct burial because its thin walls provide insufficient protection against soil corrosion and physical damage.

(CEA) Certified Electrical Apprentice Practice Test