m so pleased and happy when I ca

2021/05/21

I am so pleased and happy when I came across this site with or sincerity, I was glad. Assume we need a 4" 3-point saddle, and that we will use 45 as the center bend with 22.5 angle bends on each end. When bending a 3 bend saddle , my mark A is 30 inches and im crossing a 3 inch object then what are my measurements for mark B and C. Dan Harmon (author) from Boise, Idaho on February 23, 2014: 10 degrees rise per inch = .08". Multiply the radius of the bend you want to make by 6.28, then by degrees, bend and divide by 360.

You may or may not need to know how to bend conduit, depending on your choice of fields. Thanks for this easy to understand site.

Our second mark will be 12" away at 35 and 7/16". How can i know the different take off of degree of pipe using tangent.

Sorry I left out a few words, may be confusing so.. After I bent the first at 22, I then tried 10 degrees but it seems the multiplier (6) is too big.

The center of the bend should be very close to the center of the pipe. GREAT WRITE UP!!!

When working with large rigid conduit a wrong bend is not a easy fix, and also expensive.

Only a few numbers and math operations need to be memorized to make offsets, saddles and 90 degree bends. Great in-content links, very relevant to the review, and as a former electrician, good information to boot! Please verify if my calculations are off or if I am missing something, I never took trig but my calculator did and I can recreate your results on paper with it but the multipliers don't seem to be working.. Dan Harmon (author) from Boise, Idaho on March 06, 2012: ?? Shrinkage of an offset is the difference between "b" and "c" in the first diagram. We just got this bender about 6 months ago and I'm always the one running to the shop to bend pipe, If I can get it down to the science that I know it is, I would b happy :), I'm still having a little trouble understanding the calculations probably because when in high school I finished all my math early and opted against trig so I could talk to all the honeys in business math, now look where I'm at!! It is a pleasure to share what I have learned over the years, and I'm always glad when someone finds it useful.

The length of side B is the length of side A divided by the tangent of angle (d).

Hope the information has been of some help to you. That would be dependent on the bender used. I tried 22 degrees as close together as possible, it was over 9 inches. The tangent of angle (d) is side A divided by the length of side B.

Dan Harmon (author) from Boise, Idaho on May 03, 2013: You're probably right that we use 22.5 degrees because it is 1/4 of a 90. Im a 20+ year electrician. Learn'd more in 3 days studying your post than 3 weeks in multiple books. This app works great and is very accurate.

Started out wiring house's, then on to schools, hospitals, grocery stores and now work as a lineman at a utility company in substations. That's a more reasonable length for an offset in 3 1/2" pipe, so it can be used where a 10 offset cannot. Question: I have a 10' piece of 3/4" aluminum electrical conduit. Depending on the state you live in, you may be required to go to school to learn much of this, as well as working as an apprentice learning the trade. If you want to design the thing & tell me what to do have at it.

Some thoughts here: I always use the bender upright, which requires someone to hold it from falling over.

I simply got curious one day and put some of my college math to work - it's been useful ever since. I actually do enjoy sharing my knowledge and work tips with others. Of course it was all about the basic trig which many learned to be afraid of way back when in some classroom or other. Easily select between different types of benders and choose the size of the shoe and conduit type that you're using.

greenlee

Answer: Given that the 90 is already bent, the same calculations as for an offset will give a pretty close answer.

Question: Is there a formula for concentric conduit bending? Who needs memory when you have Dan Harmon at dengarden lol. The only tools you need for more complex bends are an angle finder and a cheap scientific-type hand calculator or, in today's world, a smartphone with a calculator.

For example, if you had from left to right, 1/2" pipe and a 3/4" pipe, the offset on your 1/2" starting at 24" and you were bending 30 degree bends for a 6" offset, and you wanted 1" between your pipes, you'd make the following marks, measuring from bottom up. I need to have 80" in the middle, with a 90 on each end.

Dan Harmon (author) from Boise, Idaho on October 14, 2010: You are more than welcome.

If your using a hand, dunno why you would cuz it will look like crap, but it will be stamped on the side.

Dan Harmon (author) from Boise, Idaho on April 13, 2015: LOL - that's the way it goes, John.

Pay for the premium version.

Again, C = A / sine(22).

JD Curtin from Brighton, Colorado on December 02, 2015: Wow this is great! Note that this can also be written as C = A * (1 / sine(22)). I'll use this new knowledge when teaching my reluctant math students. This gives us 2.125". If you don't find what you are looking for among my other articles, leave a comment and Ill consider addressing your question in future articles; the whole series is a work in progress.

Thanks again.

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electrical conduit radius formulas offset

Dan Harmon (author) from Boise, Idaho on May 18, 2020: Sorry, there is no link to provide a hard copy.

What is the length loss of a 90 bend? Dan Harmon (author) from Boise, Idaho on January 30, 2015: Thank you, Steven.

Learning to read blueprints and sometimes schematics will be important. So glad I found this hub. Dan Harmon (author) from Boise, Idaho on September 15, 2014: That depends on what you are doing. Using these formulas will enable the electrician to bend very nearly any angle he or she wants to.

miter The "hook" that the pipe fits through sometimes doesn't want to come all the way back to the shoe, the bottom shoe may not be fully back, etc. But thanks all the same. I've never had to build odd offsets into a cable tray, but have done plenty of big pipe and have more than a few come back later and ask if I could teach them how to avoid costly mistakes.

In the final analysis it will always be necessary to round off and simply choose the nearest fractional equivalent to the calculated decimal figure. Sorry about this. The A and C bends must be made with the bender reversed. Side C = 4 / sine(22.4), or 10.45".

The formula is (distance between pipe + diameter of pipe) x tan(half the offset angle). Although it is stamped on every bender I've ever seen, just as you say.

I suspect you are asking where to put that 90 as well, and that becomes a very different proposition as different pipes will have a different radius of bend. I'm curious as to why you would add 1.25" to determine the minimum radius of a 2" conduit (as used in ugly's multi-shot:90 degree bending example.

Makes life easier and prevents math errors. Shoot us an email and we will get right back to you!

So, 60\17 = 3.5.

Ron Stewart from Knoxville, Tennessee on October 13, 2013: I been doing electrical work for about 35 years. The sine of 22 = .3846, and 1 / .3846 = 2.6, which is the familiar multiplier for a 22 offset. What are B and C? And thanks for the compliment; if you're happy with the hub it must be of some use to you. I understand that in class that might not be close enough, and you could go the extra distance and memorize each 1/16" as well, but it won't usually match exactly, either.

See https://dengarden.com/home-improvement/a-conduit-b for complete instructions for saddles. And make sure that your calculator is set to describe angles in degrees, not in radians; radians are useless for the electrician.

Dan Harmon (author) from Boise, Idaho on April 30, 2012: @ Brian: If you got a 6.5" offset with marks 28.75" apart you have a 13 degree bend.

Dan Harmon (author) from Boise, Idaho on October 03, 2011: I'm sorry, I'm not familiar with that term - it isn't used in my area.

The length of side A is the tangent of angle (d) times the length of side B. Side B = 4" / tan(22.5) or 9.65". In particular, you will have to know how to get inverse functions on your calculator; these functions convert a sine, cosine, or tangent figure into an angle, into the degrees of bend you need.

Most electricians forget about or ignore this shrinkage on three-point saddles, and as a result, the center of their bend is not centered over the obstruction they are crossing. When the calculated result doesn't match one of the memorized eighth inch numbers (and it very seldom does) I simply choose the nearest one.

Julie Burke from Alaska on October 04, 2010: I didn't even realize that trig would be pertinent to bending conduit! I can't remember for 3" pipe, but often a different shoe works very well to set under the end of the conduit to level it.

As an exercise, consider an offset of 12" using two 22 bends.

I also wanted to add, as a general rule, I find that,if you need to make an uncommonon degree offset (such as 17), your multiplier is how many times the degrees goes into 60. The difference between B and C is our shrinkage; the center of our three-point saddle will move just under 1". Up to six family members can use this app with FamilySharing enabled. Dan Harmon (author) from Boise, Idaho on September 10, 2014: Dan Harmon (author) from Boise, Idaho on February 25, 2014: That would depend on the desired angle of rise and what angle the center bend is to be bent at.

A 3 degree variance from what you want is 30%, while if you are making a 30 degree bend and go over 3 degrees that's only 10%. Bending offsets and such requires use of decimals to make the calculations (or at least it's much easier that way), but to then use the result on a tape measure requires the use of fractions. Question: I'm trying to bend a 10 stick of 4 EMT in the centerline of the conduit so I can get equal lengths on both ends. This article is accurate and true to the best of the authors knowledge.

Hahahahah. My own memory aid is this: where the hypotenuse is the longest side, the opposite is the side opposite the angle, and the adjacent is the side that touches the angle but is not the hypotenuse.

I think these benders should be made with more precision, like I said the thing that holds the pipe to the shoe and the shoe has too much play and ends up bending the pipe where u had not anticipated. Seems like you have a different/ better way to proceed than me. While this is not usually important in smaller conduit, it most definitely comes into play in the bigger stuff. He has extensive experience in most areas of the electrical trade.

Normally, this would be impossible using a 10 bend, as two bends cannot be made that close together (12) in a conduit that large.

Question: how do i figure out the development for a 15 degree saddle bend if the center line radius is 25"? Answer: There is no real formula, but it can be calculated with a fair degree of precision. I'm glad you liked it - it's information few electricians know anything about, but can certainly learn.

QuickBend is the quickest and most accurate conduit bending calculator app.QuickBend is an advanced conduit bending calculator that was created to be fast and accurate while being visually appealing, innovative, and intuitive. Content is for informational or entertainment purposes only and does not substitute for personal counsel or professional advice in business, financial, legal, or technical matters. You would have to check in practice, but I suspect that the NEC figure is to the inside of the bend, meaning that the loss will be 3/4" less than what is calculated: the length of the completed bend will be 3/4" more than the minimum radius.

The pipe above is bent into an offset.

I need to know how to figure it out. We have a little roofers' angle finder at our shop that I use for finding angles. I guess my almost perfect pipe will be getting outfitted with a nice new coupling lol :) at least it wasn't too small..

This is a lot easier to understand if you draw your pipes first so you can visualize how your marks will be moving on each subsequent pipe.

If you're making another pipe to fit onto a rack next to the 2" pipe, it will have to have a radius of that figure plus the distance between pipes (plus half it's own diameter, of course).

It's always nice to hear that my writing has been of value.

for a memory aid: Chief Sohcahtoa S= O/H C=A/H T=O/A, probably works for me since I'm Cherokee ;-).

But i still find myself coming back.

Perfect for quick referencing offsets and saddle's. Answer: The only way to do it is with "concentric bends" where the bends are equal, not concentric. The last bender that you selected will be the bender that appears when you open the app up again.