Mike Holt - Free Resources – Conduit Bending Handout and Sizing Conduit or Tubing Spreadsheet

This article was posted 03/14/2012 and is most likely outdated.

Free Resources – Conduit Bending Handout and Sizing Conduit or Tubing Spreadsheet

Free Resources – Conduit Bending Handout and
Sizing Conduit or Tubing Spreadsheet

Bill Bamford of Wirelab Services recently updated his 2 informational documents which we offer on our Free Stuff page. Below are links to them and a short description of each.

Bending Conduit/Tubing Using Hand Benders

The conduit bending handout steps the student through the process of hand bending stub-up, offset, back-to-back, 3-point and 4-point saddle bends. It also provides some extra info on bending terminology, making multiple bends on one conduit, bending charts (including examples on calculating final conduit length after bending so that the conduit can be threaded prior to bending).

Sizing Conduit or Tubing per 2011 NEC

The spreadsheet is an Excel spreadsheet. It calculates the conduit/tubing size for any number of up to 10 combinations of wire and or cable sizes. It also warns you if you have the potential for jamming as described in Table 1 Note 2 in Chapter 9. It allows cable size input by either fractions or decimal. It includes all conduit, tubing, conductors (bare, insulated, and compact stranded) providing the same results as Annex C with the addition of the ability to mix conductor and cable sizes.

For a complete listing of all the free resources we make available to the industry please visit our Free Stuff page.

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Comments

Mike also has a spreadsheet that I did for voltage drop calculations on his free stuff. It asks a for a few inputs and even calculates parallel wires. Three of the inputs are length, load (in amps), and wiresize. If you leave any one of the three blank, the software will provide the third data. For instance, if you leave amps blank, it will tell you the maximum amps you can place on the wire to maintain the selected maximum voltage drop percentage selected.

bill bamford April 3 2012, 7:21 pm EDT
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Steve, I added some more features to the conduit sizing spreadsheet including an ability to change the size of the selected conduit. Enjoy. If you find any discrepancies, don't hesitate to let me know so that I can correct them. Mike Holt is very prompt at putting updates on the site. The new spreadsheet should be dated Apr. 4 even though it was updated on the 3rd.

bill bamford April 3 2012, 7:11 pm EDT
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Nice work! It would be even better if it would calculate the percent used of allowable conduit fill. Many clients ask us not to exceed 80% of allowable, i.e. 32% fill in most cases.

Steve Kurtzman March 15 2012, 11:11 am EDT
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WOW! Wirelab looks like a great product. How much is the site license?

Ty Keith March 15 2012, 9:45 am EDT
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