CEA Conduit Bending and Installation 5 — Questions and Answers
Question 1: What is the correct procedure for deburring the inside of a cut conduit end before pulling wire?
- Sand with 80-grit sandpaper
- Use a conduit reamer or deburring tool to remove sharp edges (Correct answer)
- File the outside edge only
- Heat the end until smooth
Correct 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.
Question 2: The 'developed length' of a conduit bend refers to:
- The length of conduit wasted during bending
- The arc length of the conduit through the bend (Correct answer)
- The total run length of the conduit system
- The distance from the start of the bend to the box
Correct 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.
Question 3: When concentric bends are required (multiple conduits bending around the same radius), what is adjusted for each successive conduit?
- The bend angle
- The bender shoe size
- The distance between the bender arrow and the bend mark
- The developed length of each successive conduit (Correct answer)
Correct 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.
Question 4: In which situation is a conduit body (LB, LR, LL, T) preferred over a box with a cover?
- When the conduit run has more than four conductors
- When making a direction change in a short run with limited pulling access (Correct answer)
- When a junction or splice is required
- When the conduit is larger than 1 inch
Correct 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.
Question 5: Flexible Metal Conduit (FMC) is typically used in final connections to:
- Underground service entrance equipment
- Motors and equipment subject to vibration or requiring movement (Correct answer)
- Outdoor panels in wet locations
- Long straight runs to reduce installation time
Correct 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.
Question 6: What is the multiplier used to calculate the distance between bends for a 45-degree offset?
- 1.155
- 1.414 (Correct answer)
- 2.000
- 2.613
Correct 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.
Question 7: When installing EMT conduit in a concrete pour, what additional requirement applies?
- The conduit must be coated with PVC or listed for concrete encasement (Correct answer)
- Standard EMT with compression fittings is always acceptable
- The conduit must be at least 1.5 inches in diameter
- EMT is never permitted in concrete
Correct 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.
CEA Conduit Bending and Installation 5
What is the correct procedure for deburring the inside of a cut conduit end before pulling wire?