Journeyman Electrician's Conduit Bending Flashcards
7 cards from real Journeyman Electrician’s Exam practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Journeyman Electrician's Conduit Bending flashcards as text
What is "shrinkage" in the context of conduit offsets?
Answer: The amount the straight conduit run must be shortened to account for horizontal distance lost in the offset
Shrinkage is the reduction in straight run length required because an offset section covers less horizontal distance than a straight section of equal conduit length would.
For a 45-degree offset, the shrinkage is approximately how much per inch of offset height?
Answer: 0.414 inch
A 45-degree offset has a shrinkage of approximately 0.414 inches per inch of offset height (the multiplier 1.414 minus 1.000 = 0.414).
What is a "rolling offset" in conduit bending?
Answer: An offset that travels in two planes simultaneously, both vertically and horizontally
A rolling offset must move in two planes at once, requiring trigonometric calculations to determine the true offset distance and the correct angle for bending.
When multiple parallel conduits must all make 90-degree bends while remaining evenly spaced, which bending technique is used?
Answer: Concentric bending
Concentric bending maintains even spacing between parallel conduits by progressively increasing the bend radius for each successive outer conduit in the group.
For a conduit offset over an 8-inch high obstacle using 45-degree bends, what is the total shrinkage to deduct from the straight conduit run?
Answer: 3.31 inches
Shrinkage = 8 x 0.414 = 3.31 inches must be subtracted from the straight conduit run to properly lay out the full run.
What type of small offset is used to move conduit into alignment with a panel enclosure or box knockout?
Answer: Box offset (kick)
A box offset, also called a kick, uses two small bends placed close together to align conduit with a panel or enclosure knockout.
What is the primary advantage of using 30-degree offset bends instead of 45-degree bends for the same offset height?
Answer: 30-degree bends create a more gradual angle, resulting in less shrinkage and easier conductor pulling
30-degree offsets produce a more gradual bend angle with less shrinkage (0.25 vs. 0.414 per inch), reducing friction when pulling conductors, though the marks must be placed farther apart.