Conduit & Raceway Systems Flashcards
7 cards from real EETC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Conduit & Raceway Systems flashcards as text
When making a 90° stub-up bend with a hand conduit bender, the term 'deduction' or 'take-up' refers to:
Answer: The amount subtracted from the desired stub height to mark the bend point
The deduction (take-up) is the amount subtracted from the desired finished stub height to determine where to place the arrow mark on the conduit before bending, accounting for the conduit that travels through the curve.
An 'offset bend' in conduit is used to:
Answer: Shift the conduit parallel to itself to clear an obstacle such as a beam
An offset consists of two equal bends in opposite directions that shift the conduit sideways while maintaining the same general direction, allowing it to bypass beams, pipes, or other obstructions.
The 'gain' (or 'shrinkage savings') in conduit bending refers to:
Answer: The length saved because conduit travels diagonally through the curve rather than in a right-angle path
Gain is the length saved in a bend because the conduit travels along the arc of a curve rather than along two straight legs meeting at a right angle, so less total conduit is needed than a simple right-angle calculation would suggest.
When installing EMT into an enclosure located in a wet location, the NEC requires:
Answer: Compression-type fittings listed and marked for wet or rain-tight use
NEC 358.42 requires fittings used in wet locations to be listed for wet locations; compression-type fittings provide the rain-tight or wet-location seal required by the Code.
The maximum spacing between conduit supports for 3/4-inch EMT installed in a horizontal run is:
Answer: 10 feet
NEC 358.30 requires EMT to be supported at intervals not exceeding 10 feet for trade sizes up to and including 1-1/4 inches, and within 3 feet of each outlet box or fitting.
When field-bending PVC conduit, the approved method is to:
Answer: Apply heat with a heat gun or oven until pliable, then form the bend by hand
PVC conduit must be uniformly heated until pliable (using a heat gun, heating blanket, or hot box) and then bent to shape; cold-bending PVC causes cracking and kinking.
A 'saddle bend' (four-bend saddle) in conduit is used to:
Answer: Pass the conduit over a pipe or obstruction while returning to the original plane
A four-bend saddle uses two pairs of equal opposing bends to rise over an obstacle and return to the original pathway height, allowing the conduit to bridge obstructions like pipes or beams.