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Conduit Bending Practice Test

Twenty original exam-style questions on what apprentice and JATC bending tests cover: take-up, multipliers, shrink, saddles, kicks, the 360° rule and conduit fill. Tap an answer to see why it is right.

By Blissom · Updated 2026-10-23

Practise on real pipe with guide modeConduit Bending Calculator for Android · $7.99 one time · offline · no ads
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The test

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  1. What is the common take-up (deduct) on a 1/2" EMT hand bender, per Klein's guide?

  2. You need a 12" stub-up on 3/4" EMT. Where does the arrow go?

  3. What is the multiplier for a 30° offset?

  4. How much does a 30° offset shrink per inch of depth?

  5. A 4" offset with 30° bends: how far apart are the marks, and what is the shrink?

  6. A 6" offset with 45° bends, using the bender multiplier. Distance between the marks?

  7. What is the multiplier for 22.5°?

  8. When you bend an offset toward an obstruction, what do you do with the shrink?

  9. Between the two bends of an offset, how far do you rotate the conduit?

  10. In a standard 3-point saddle with a 45° center bend, what are the two outer bends?

  11. For a 45° 3-point saddle 2" deep, how far is each outer mark from the center mark?

  12. Which mark on the bender is used for the center bend of a 3-point saddle?

  13. What is the star point on a hand bender used for?

  14. A rolling offset moves 6" horizontally and 8" vertically. What is the true offset?

  15. In an idealized straight-line layout, a 30° sloping leg must rise 3". How long is that sloping leg?

  16. What is the maximum total of bends allowed between pull points?

  17. A 3/4" EMT hand bender can also bend which size of rigid conduit?

  18. Under the general NEC Chapter 9, Table 1 rule (not the short-nipple exception), what is the maximum conduit fill for three or more conductors?

  19. How many #12 THHN conductors fit in 1/2" EMT?

  20. In box fill, how many allowances does a receptacle (one device yoke) count as?

Answer key

Show all 20 answers with explanations
  1. What is the common take-up (deduct) on a 1/2" EMT hand bender, per Klein's guide? 5". Klein lists 5" for 1/2" EMT, 6" for 3/4", 8" for 1" and 11" for 1-1/4"; other makers can differ, so check your shoe.
  2. You need a 12" stub-up on 3/4" EMT. Where does the arrow go? 6" from the end. Stub height minus take-up: 12" − 6" = 6".
  3. What is the multiplier for a 30° offset? 2. 1 ÷ sin 30° = 2. The distance between bends is twice the offset depth.
  4. How much does a 30° offset shrink per inch of depth? 1/4". About 1/4" per inch by the field rule; the ideal sharp-corner value is tan 15° = 0.268.
  5. A 4" offset with 30° bends: how far apart are the marks, and what is the shrink? 8" apart, 1" shrink. 4 × 2 = 8" between bends; 4 × 1/4" = 1" of shrink.
  6. A 6" offset with 45° bends, using the bender multiplier. Distance between the marks? 8-3/8". 6 × 1.4 = 8.4", about 8-3/8".
  7. What is the multiplier for 22.5°? 2.6. 1 ÷ sin 22.5° = 2.613, used as 2.6.
  8. When you bend an offset toward an obstruction, what do you do with the shrink? Add it to the measurement. When the offset must be complete by a fixed point ahead of you, the bends use up conduit, so the marks move out by the shrink: add it to that measurement. If the offset starts at a fixed point, the marks do not move.
  9. Between the two bends of an offset, how far do you rotate the conduit? 180°. Exactly 180°, so both bends lie in one plane. Anything else causes a dog-leg.
  10. In a standard 3-point saddle with a 45° center bend, what are the two outer bends? 22.5° each. Each outer bend is half the center bend: 22.5°.
  11. For a 45° 3-point saddle 2" deep, how far is each outer mark from the center mark? 5". Depth × 2.5 = 2 × 2.5 = 5" on each side.
  12. Which mark on the bender is used for the center bend of a 3-point saddle? The rim notch (teardrop). On most benders, the notch or teardrop marks the middle of the bend, so the center of the saddle lands on the mark.
  13. What is the star point on a hand bender used for? The back of a 90, for back-to-back bends. The star shows the back of a 90 with the bender reversed, so back-to-back bends can be marked without subtracting the take-up.
  14. A rolling offset moves 6" horizontally and 8" vertically. What is the true offset? 10". √(6² + 8²) = √100 = 10".
  15. In an idealized straight-line layout, a 30° sloping leg must rise 3". How long is that sloping leg? 6". Right-triangle geometry: sloping-leg length = rise ÷ sin(angle) = 3" ÷ 0.5 = 6", and the horizontal run is about 5-3/16". A real kick also has a bend radius, so the actual marks depend on the bender.
  16. What is the maximum total of bends allowed between pull points? 360°. The NEC limits bends between pull points to 360° in total (358.24(B) for EMT in the 2023 NEC).
  17. A 3/4" EMT hand bender can also bend which size of rigid conduit? 1/2". 1/2" rigid, with the same take-up, on a shoe rated for it. A rated 1" EMT shoe bends 3/4" rigid.
  18. Under the general NEC Chapter 9, Table 1 rule (not the short-nipple exception), what is the maximum conduit fill for three or more conductors? 40%. 40% (NEC Chapter 9, Table 1). One conductor 53%, two 31%, and 60% for a nipple of 24" or less between enclosures (Note 4).
  19. How many #12 THHN conductors fit in 1/2" EMT? 9. Nine. 3/4" EMT holds 16.
  20. In box fill, how many allowances does a receptacle (one device yoke) count as? Two. Two allowances, based on the largest conductor connected to the device (314.16(B)(4)).

How to study conduit bending

  • Memorize two values for each common offset angle, the multiplier and the approximate shrink per inch: 10° = 6 and 1/16", 22.5° = 2.6 and 3/16", 30° = 2 and 1/4", 45° = 1.4 and 3/8".
  • Know your own bender's take-up by heart (Klein's guides give 5, 6, 8 and 11 for 1/2" to 1-1/4" EMT; check the number on your shoe).
  • Bend scrap: a 90, an offset, a saddle. Measure the results and compare them with the calculators here.
  • Learn why the numbers work (the formulas); test questions often change the angle to see if you can work it out.

Sources: NEC 2023 358.24(B) (360° limit; the 2026 NEC adds 300.24), Chapter 9 Table 2 (bend radius), Tables 1, 4 and 5 (conduit fill), 314.16 (box fill) and 310.15(C)(1) (ampacity adjustment); Klein Tools Conduit Bender Guide (stub take-up, offset multipliers and shrink, saddles). Method.

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