By Jack Benfield
The company of bending conduit isn't so complex because it seems at the start making bends that healthy correct the 1st time is simple if one follows a number of uncomplicated ideas. because the writer promised, now not a unmarried technical be aware 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 easy paintings of constructing conduit bends that healthy!
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Additional resources for Benfield Conduit Bending Manual
For “rolling offsets” it is best to use 30° bends for easier wire pulling. ” This offset must be made just deep enough to allow the conduit to clear the corner. (See dimension “X,” Figure 23). Note that offset “A” on East wall is made first. " Step Three: With bender in air, (end of handle on floor) position the conduit in the tool so the completed offset “A” rests towards the right and in a plane at 90° to the bender groove. ” Note: In Figure 23 the run is from right to left. If the run was left to right (West wall to South wall-Figure 24) FIG.
23 Rolling offset external corner position conduit in the tool so completed offset “A” rests towards right to left. ” This offset depth must be measured outside to outside. ” Figure 25. ” Step Three: With bender in air (end of handle on floor) position the conduit in the bender so the completed offset “C” rests towards the left in a plane at 90° to the bender groove. " FIG. 24 Rolling offset external corner left to right. 34 Chapter 7 Note One: In Figure 25, the run is from right to left. just save the bent section for use elsewhere.
This chapter explains how to do both. Let us suppose the job calls for an exposed run of conduit from a sign, a light, or a piece of equipment on the East wall of a building to a control switch to be mounted at a convenient level on the South wall of the building. ” The Benfield technique for making regular offsets to exact measurement is explained in Chapter Two. For your convenience the Benfield Offset Formula and Zip-Guide Speed Table in condensed form is reprinted at the end of this chapter.
Benfield Conduit Bending Manual by Jack Benfield