Conduit Bending Flashcards

DBB = bend multiplier X rise of the offset

Shrink = shrink constant X rise of offset

Angle number divided by 120

<p>11.4</p> Signup and view all the answers

<p>5.76</p> Signup and view all the answers

<p>3.86</p> Signup and view all the answers

<p>2.61</p> Signup and view all the answers

<p>2</p> Signup and view all the answers

<p>1.41</p> Signup and view all the answers

<ol> <li>Measure rise of offset 2. Choose bend angle 3. Identify bend multiplier 4. Calculate distance between bends 5. Find chosen angle shrink constant 6. Calculate shrink 7. Determine location of first bend 8. Determine the location of the second bend 9. Bend</li> </ol> Signup and view all the answers

<p>The smallest conduit (interior conduit) will be the starting conduit, this conduit will be laid out and fabricated as normal.</p> Signup and view all the answers

<p>Designate one offset as the starting offset. When marking conduit #1, no adjustment factor is needed; layout and mark as normal.</p> Signup and view all the answers

<p>Determine the center to center spacing of your conduits.</p> Signup and view all the answers

<p>Find the parallel offset multiplier (angle number divided by 120).</p> Signup and view all the answers

<p>Calculate parallel offset adjustment constant (A = C to C times multiplier).</p> Signup and view all the answers

<p>Beginning with conduit #2, add or subtract the adjustment constant to mark 1 of your starting offset.</p> Signup and view all the answers

<p>Repeat step 5 when laying out conduit #3, taking care to now use conduit #2 as the reference.</p> Signup and view all the answers

<p>Continue the same method with any subsequent offsets.</p> Signup and view all the answers

<p>Determine the center to center spacing of the conduit.</p> Signup and view all the answers

<p>To layout the second 90, add the C to C spacing to the measurements of both the stub and the leg of the first conduit.</p> Signup and view all the answers

<p>Bend 90 as usual.</p> Signup and view all the answers

<p>Repeat for any further 90s.</p> Signup and view all the answers

<p>Measure the height of the obstruction (you will need to add a small amount to this measurement about a quarter to half an inch depending on the size of the conduit used or the type of obstruction).</p> Signup and view all the answers

<p>Choose bend angles. The multiplier of smaller angles will determine the best angles to use.</p> Signup and view all the answers

<p>Find distance between bends. Multiply the chosen angles (bend multiplier X rise of the saddle).</p> Signup and view all the answers

<p>Find chosen angle shrink constant. Find using the formula angle divided by 120.</p> Signup and view all the answers

<p>Calculate shrink. Multiply shrink constant X rise of saddle.</p> Signup and view all the answers

<p>Determine center of center bend: measure from the reference end of the conduit to the center of the obstruction, add shrink to this measurement; this will be the measurement to the center bend.</p> Signup and view all the answers

<p>Determine the center of the two smaller bends: measure DBB to the left from mark 1 to find mark 2; measure from DBB to the right from mark 1 to find mark 3.</p> Signup and view all the answers

<p>Total length of conduit: total length = measured length + (2 X shrink).</p> Signup and view all the answers

<p>Bend</p> Signup and view all the answers

<p>Shrink = shrink constant X rise.</p> Signup and view all the answers

<p>Total length before hand or stub + leg after bend.</p> Signup and view all the answers

<p>Distance from bend to end of conduit or another bend.</p> Signup and view all the answers

<p>A 90 bend in conduit made perpendicular to the original length of the conduit with the conduit extending a specified length from the back of the bend.</p> Signup and view all the answers