By Jack Benfield
The enterprise of bending conduit isn't so complex because it appears to be like at the start making bends that healthy correct the 1st time is simple if one follows a number of easy ideas. because the writer promised, now not a unmarried technical note has seemed during this guide -no excessive math... no “trig”...no sines...no co-sines...no algebra or geometry was once had to research the straightforward artwork of creating conduit bends that healthy!
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Therefore, the center mark should be placed 3/8” ahead to allow for this shortening or shift. FIG. 39 Location of marks. To locate points “B” and “e” use the table in Fig. 39. ” Make the 45° center bend “A” first placing the mark opposite the rim notch on the groove of the bender. FIG. 40 Proper position of bender. Next make 22 1/2° bends at “B” and “e” placing these marks opposite the zero degree line on the tool. Fig. 40 illustrates the position of the bender. Then make the two 22 1/2° side bends to complete the saddle.
Stub-ups should be tied together above the level of the pour …such runs are turn-proof, won’t twist, shift or get knocked about even if the run is brutally trampled upon by other trades during the pour. Tie down the horizontal runs at the deck level first. Then wire-tie the stub-ups together above the FIG. 30 Sequencing is important. floor level. 38 Chapter 9 This sequence is important! It provides extra rigidity to the run and helps resist shifting of stubs due to manhandling, concrete buggies, tampers, careless laying of catwalk planks, etc.
A gooseneck bend (Fig. 27) is not good practice because the open loop appears as a sturdy hand-grab, but it is usually unsafe. Wall to ceiling Making a transition run from a wall to a ceiling can be tricky. Conduits if run directly from a wall switch to a center ceiling fixture using a gooseneck bend will leave an ugly air gap at the ceiling corner. To avoid this air space, use two 90° bends as shown in Fig. 28. the other bend lays flat on the ceiling. FIG. 26 Over-the-top with two 90° bends (wall to roof).