Electrician Tools
Bend it right the first time. All pure trig — no code tables reproduced.
Conduit Offset Bender
Two equal bends to clear an obstacle. Mark distance + shrink, instantly.
Distance between bends
10"
multiplier ×2
Total shrink
1.34"
add this to your measured mark
Measure to the obstacle, add the shrink, make your first mark, then measure the distance-between-bends to the second mark. Bend both at 30° the same direction.
Voltage Drop
Vd = 2·K·I·L ÷ circular-mils (√3 for 3-phase). K = 12.9 Cu / 21.2 Al.
Voltage drop
7.9 V
6,530 circular mils
% drop
6.58%
over 3% — size up
3% branch / 5% total is the common design target — confirm requirements for your jurisdiction and application.
Bender Cheat Sheet (memorize these)
10°
multiplier
×5.76
shrink 0.087"/in
22.5°
multiplier
×2.61
shrink 0.199"/in
30°
multiplier
×2
shrink 0.268"/in
45°
multiplier
×1.41
shrink 0.414"/in
60°
multiplier
×1.15
shrink 0.577"/in
- Offset: distance between bends = offset height × multiplier.
- Shrink: total = offset height × the shrink-per-inch above. Add it to your mark so the run lands where you want.
- 3-bend saddle (center 45°, two 22.5°): center mark = obstacle center; outer marks = 2.5 × obstacle height each side.
- Ohm's law: V = I×R · P = V×I · I = P÷V. Keep it on the truck.
