EETC Wiring Methods 4

Question 1

When running Type NM cable through a 2x4 wood stud, what is the minimum distance the cable must be from the edge of the stud before a nail plate is required?

Accepted Answer

1¼ inches

Answer

NEC 300.4(A)(1) requires a steel nail plate or the cable must be at least 1¼ inches from the nearest edge of a stud to protect against fastener penetration.

Question 2

In an outdoor installation, which conduit type is permitted to be used above grade exposed to sunlight and weather?

Accepted Answer

IMC with listed fittings

Answer

Intermediate metal conduit (IMC) with listed fittings is suitable for outdoor, wet, and exposed-to-weather locations per NEC 342.10.

Question 3

What is the minimum support interval for rigid PVC conduit (Schedule 40) with a trade size of 1 inch?

Accepted Answer

4 feet

Answer

NEC Table 352.30 requires PVC conduit (1-inch trade size) to be supported at maximum 4-foot intervals.

Question 4

A common mistake when pulling wire through conduit is exceeding the maximum pulling tension. Which factor most directly limits this tension?

Accepted Answer

Conductor cross-sectional area and fill ratio

Answer

Maximum pulling tension is determined by the conductor size (cross-sectional area) and the coefficient of friction, which relates to fill and conduit geometry.

Question 5

Type MC cable (Metal-Clad) is defined under which NEC article?

Accepted Answer

Article 330

Answer

NEC Article 330 covers Type MC (Metal-Clad) cable, including its construction, uses permitted, and installation requirements.

(EETC) Electrical Technician Certification Practice Test

(EETC) Electrical Technician Certification Practice Test

EETC Wiring Methods 4