Bending Conduit

Conduit does exactly what your marks and your hands tell it to do. Plan the route, control the plane, and use one repeatable method. Overbending, fighting it back, and hoping the couplings hide the error is not a method.

Walk the route before you mark the pipe

Confirm the raceway type and size, route, supports, fittings, pull points, conductor fill, and total bends. Look for water, corrosion, heat, movement, fire-rated penetrations, physical damage, and other trades headed for the same space. The shortest route on paper can be the worst pull in the building.

Think from the reel all the way to the last box. Where will the tugger or crew stand? Can you open the pull boxes later? Are you stacking bends right at an enclosure? Is a coupling about to disappear behind ductwork? Bending starts with a route that can actually be built.

Learn the bender in your hands

Use the bender made for that conduit and size. Check the shoe and markings. Arrow, star, degree marks, and rim references do different jobs, and take-up changes with the tool and size. Read this bender instead of trusting a number remembered from another one.

Cut square, ream inside and out, and knock out the chips. Measure from one solid reference and use a fine mark. Decide which edge of that mark is the finished point. A fat marker line can make an entire exposed rack look crooked.

Make the stub land where you said it would

For a stub-up, take the finished height and subtract the bender's take-up. Put the arrow on that mark. Keep the conduit seated in the shoe, put your weight on the heel, and pull the handle smoothly. If the pipe is lifting out of the shoe, you are not bending it—you are kinking it.

Check the bend with a level or square. Spring-back is real, but a blind extra tug is not a correction plan. Learn how that pipe and bender respond. Bending back and forth until the angle looks close flattens and weakens the raceway.

Offsets are usually ruined by rotation

An offset uses two equal bends in opposite directions to step around something and continue parallel. A shallow offset takes more length but pulls easier. A steep offset fits tighter but makes the conductors work harder.

Use the multiplier for the angle and the offset height to space the marks. After the first bend, rotate the conduit into the exact second-bend plane. Sight down it or use a level. Most doglegs come from a little twist between bends, not bad multiplication.

Back-to-backs and saddles compound mistakes

A back-to-back bend makes a U-shaped change. Check the first bend before laying out the second, and account for the bender geometry and the outside finished dimension. If bend one is wrong, bend two does not rescue it.

A saddle crosses an obstacle and returns to the original line. Measure the center, width, height, and clearance. Three-bend saddles are compact; four-bend saddles give a flatter crossing. With several bends, every small mark and rotation error adds up, so slow down and keep the plane under control.

Build parallel runs as one piece of work

Pick a common reference and plan the spacing through every turn. Inside and outside conduits do not travel the same distance. Copying identical marks across the rack can produce a mess. Account for shrink, gain, radius, and spacing with the layout method that fits the bend.

Before repeating a complicated bend, make one and verify it. Record the bender, size, marks, and finished dimensions. One checked sample is faster than correcting ten almost-matching mistakes.

Finish the raceway, not just the bend

Use fittings listed for the raceway and location. Seat the conduit fully and tighten it by the intended method. Keep threads sound, tubing clean, and unused openings closed. Do not let the run become a trash chute during construction.

Support it with approved hardware near terminations and at the required spacing. Do not hang it from plumbing, ceiling grid, or another trade's work. If the metal raceway is part of the grounding path, make sure the entire path stays electrically continuous and add bonding parts where required.

Stand back and judge the run

• It lands at the right equipment and elevation.
• Bends are smooth, aligned, and in plane.
• Fittings are complete and accessible.
• Supports are secure and suited to the structure.
• Fill, total bend, pull points, bonding, and environment are handled.
• It looks intentional because it was.

Practice with a tape measure, not your pride. Write down the target, the finished result, and the error. Speed shows up after your method stops changing.