IEC Wiring Methods and Materials 3

Question 1

Which of the following wiring methods is permitted for use in wet locations as a standalone installation (without additional enclosure)?

Accepted Answer

Liquidtight flexible metal conduit (LFMC)

Answer

Liquidtight flexible metal conduit (LFMC) is listed for use in wet locations per NEC 350.10.

Question 2

How many 90-degree bends are permitted between pull points in a conduit run?

Accepted Answer

Four 90-degree bends (360 degrees total)

Answer

NEC 358.26, 344.26, and related articles limit total bends between pull points to 360 degrees (four 90-degree bends).

Question 3

Type TC (Tray Cable) is most commonly installed in which environment?

Accepted Answer

Open cable tray systems in industrial facilities

Answer

Type TC cable is specifically designed and listed for use in cable tray systems, per NEC Article 336.

Question 4

When installing EMT in a corrosive environment, which protection method is required?

Accepted Answer

A different wiring method suitable for corrosive conditions must be used or the EMT must be listed for the environment

Answer

NEC 358.10(B) states that EMT shall not be used where subject to severe corrosive influences unless protected by a corrosion-resistant material or a different method is used.

Question 5

What is the minimum size trade-size conduit permitted to contain conductors used in wiring methods requiring conduit?

Accepted Answer

1/2 inch

Answer

The minimum permitted trade size for conduit is 1/2 inch per NEC 358.20, 344.20, and similar articles for most conduit types.

IEC - Independent Electrical Contractors Practice Test

IEC - Independent Electrical Contractors Practice Test

IEC Wiring Methods and Materials 3