Conduit Bending and Installation Flashcards

What is the correct procedure for deburring the inside of a cut conduit end before pulling wire?

Answer: Use a conduit reamer or deburring tool to remove sharp edges

A conduit reamer or deburring tool removes sharp internal edges that could cut wire insulation during pulling.

The 'developed length' of a conduit bend refers to:

Answer: The arc length of the conduit through the bend

Developed length is the actual length of conduit consumed as it travels through the arc of the bend.

When concentric bends are required (multiple conduits bending around the same radius), what is adjusted for each successive conduit?

Answer: The developed length of each successive conduit

Each successive conduit in a concentric set must have a longer developed length to maintain the same bend radius on a larger arc.

In which situation is a conduit body (LB, LR, LL, T) preferred over a box with a cover?

Answer: When making a direction change in a short run with limited pulling access

Conduit bodies allow direction changes in tight spaces and can be used as pull points, though splices are generally not permitted inside them.

Flexible Metal Conduit (FMC) is typically used in final connections to:

Answer: Motors and equipment subject to vibration or requiring movement

FMC's flexibility makes it ideal for final connections to motors or equipment that vibrates, moves, or requires periodic repositioning.

What is the multiplier used to calculate the distance between bends for a 45-degree offset?

Answer: 1.414

A 45-degree offset uses a multiplier of approximately 1.414 (√2); the distance between bends equals the offset height times 1.414.

When installing EMT conduit in a concrete pour, what additional requirement applies?

Answer: The conduit must be coated with PVC or listed for concrete encasement

EMT in concrete must be protected from corrosion; PVC-coated EMT or a type listed for use in concrete is required.