Module Six - Conduit Bending - NCCER Substation Slides
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May 02, 2024
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About This Presentation
Module Six - Conduit Bending - NCCER Substation Slides
Slide Content
Conduit Bending Module Six – 26204 -11
Upon completion of this module, you will be able to do the following: 1. Describe the process of conduit bending using power tools. Identify all parts of electric and hydraulic benders . Bend offsets, kicks, saddles, segmented, and parallel bends. Explain the requirements of the National Electrical Code ® ( NEC ® ) for bending conduit. Compute the radius, degrees in bend, developed length, and gain for conduit up to six inches. Objectives
Under supervision of the instructor, you should be able to do the following: 1. Use an electric or hydraulic bender to bend a 1" conduit stub-up to an exact distance of 15¼" above the deck. 2. Make an offset in a length of conduit to miss a 10" high obstruction with a clearance between the obstruction and the conduit of not less than 1" nor more than 1½". 3. Make a saddle in a length of conduit to cross an 8" pipe with 1" clearance between the pipe and the conduit. Performance Tasks
Figure 1 – Inside radius requirements
Table 1 – NEC ® Minimum Requirements for Radius of Conduit Bends – One -Shot and Full-Shoe Benders (Data from NEC Chapter 9, Table 2 )
Table 2 – NEC ® Minimum Requirements for Radius of Other Conduit Bends (Data from NEC Chapter 9, Table 2 )
Figure 2 – Typical 90° bends
Figure 3 – Applications of conduit offsets
Figure 4 – Practical application of a saddle bend
Figure 5 – Kick
Figure 6 – A right triangle and its relationship to a conduit offset
Figure 7 – Trigonometry fundamentals of a right triangle
Figure 8 – Kick example
Figure 9 – Characteristics of a circle
Figure 10 – Parts of a circle related to conduit bending
Figure 11 – Unit circle
Figure 12 – π and 2 π
Figure 13 – Gain
Table 3 – Gain Factors
Table 4 – Decimal Equivalents of Some Common Fractions
Figure 14 – Back -to-back 90° bends
Figure 15 – Typical mechanical bender
Figure 17 – Conduit
Figure 18 – Conduit with 10" mark
Figure 19 – Kick of 15 °
Figure 20 – Conduit and straightedge
Figure 21 – Conduit and horizontal straightedge
Figure 22 – Center of bend
Figure 23 – 90° stub- up
Figure 24 – 90 ° elbow
Figure 25 – Bending offsets in conduit
Figure 28 – Laying out stub- ups
Table 5 – Dimensions of Stub-Ups for Various Sizes of Conduit
Figure 29 – Laying out segment bends
Figure 30 – Specifications for sample bend
Figure 32 – Conduit center
Figure 33 – Conduit segments
Figure 34 – Two 30° sweeping bends
Figure 35 – Radians and degrees
Figure 36 – Bend centerline distance
Figure 37 – Bend centerline
Figure 38 – Bend segments
Figure 39 – Principles of concentric bending
Figure 40 – Conduit offset bending table
Figure 41 – Position of conduit in bender for making offsets
Figure 42 – 24" offset
Figure 43 – 20 " offset
Figure 44 – Principles of saddle bending
Table 6 – Saddle Table
Figure 45 – 36" saddle
Figure 46 – Saddle
Figure 47 – Cosine function
Figure 48 – Conduit layout
Figure 49 – Dog leg elimination
Figure 50 – 25" offset
Figure 51 – Extra conduit
Figure 53 – Plywood template
Figure 54 – Some PVC bends may be formed by hand
Figure 55 – After the bend is formed, wipe a wet rag over the bend to cool it
Table 7 – PVC Expansion Rates
Supplemental Art
Figure 16 – Bending protractor
Figure 26 – Typical electric bender
Figure 27 – Hydraulic conduit bender
Figure 31 – Conduit placed in hydraulic bender for segment bends
Figure 52 – PVC heating units
Figure 56 – Typical plug set
Supplemental Art
Course Map
Take Pride in Your Work
Making Accurate Offsets
Magnetic Angle Finders
Concentric Bends
Saddle Bends
Trapeze Hangers
Magnetic Level
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