Conduit Bending Fundamentals: The 90, the Offset, and the Take-Up That Rules Them All

The craft everyone can see

Wire pulls hide in walls; terminations hide in panels. Conduit runs hang in the open air where every electrician who ever walks the building will read them — parallel, level, offsets matched, 90s crisp. Clean tube is the trade's signature, and the good news for a first-year: it's not artistry. It's four teachable bends, three memorized numbers, and scrap-pipe repetition. Master these and the artistry shows up on its own.

Number one: know your take-up

Every bender head consumes tube making a 90. That consumption is take-up, and it's the key to every measured bend:

• 1/2" EMT bender: 5 inches
• 3/4" EMT: 6 inches
• 1" EMT: 8 inches

(Stamped on most bender heads — but memorize yours anyway.)

Bend one: the stub-up 90

The task: a 90 with the stub ending at exactly 12 inches.

1. Measure from the tube end: 12 − 5 (take-up, 1/2" bender) = 7". Mark.
2. Tube on the floor, bender on, arrow on the mark, hook toward the free end.
3. One foot on the bender's heel, hands on the handle: steady, continuous sweep to 90 — most benders mark 90 when the handle or head hits its indicator; verify with the torpedo level on the stub.
4. Measure. 12 inches, first try, is completely normal — that's the take-up doing the work.

Practice until it's boring at 12", then at random lengths somebody calls out.

Bend two: back-to-back 90s

A U between two surfaces — say, 30 inches apart. First 90 as above. For the second: measure 30" from the BACK of the first bend and mark; flip the bender (or use its star point — the back-of-bend indicator) on that mark, bend to 90. The star/back-of-bend marking exists precisely for this; find it on your bender today.

Bend three: the offset (the bend you'll make most)

Obstacle in the run — the tube must jog over and continue. Two equal-degree bends in opposite directions. The math:

Distance between marks = rise × multiplier, where the multipliers are: 10°→6.0, 22.5°→2.6, 30°→2.0, 45°→1.4, 60°→1.2.

Field example: clear a 4" obstruction with 30° bends → marks 8 inches apart (4 × 2.0). Bend one to 30° (benders mark common angles), slide to mark two, rotate the tube exactly 180°, sight it dead straight, bend 30° again. Equal angles + true 180 rotation = a flat offset; anything else corkscrews.

And respect shrink: an offset shortens the run's reach — at 30°, roughly 1/4" per inch of rise (so the 4" offset "eats" about an inch). Measuring to a box? Add the shrink to your mark placement first. Shrink amnesia is why apprentice offsets land short, universally, once.

Bend four: the kick — later

A single partial bend giving the tube a gentle rise into a box. It's an offset's little cousin; it'll make sense the week the job needs one.

The practice program

A bundle of scrap 1/2" EMT and one lunch hour a week: 12" stubs till boring; back-to-backs at called distances; 30° offsets at 2", 4", 6" rises — each one checked with the level and the tape, each failure diagnosed (short = shrink or take-up; corkscrew = rotation; kinked = jerky sweep). A month of that and journeymen start handing you the bender on purpose. That's the whole apprenticeship in miniature: reps, numbers, and tube you're proud to hang where everyone can see it.