In my NCCER textbook on conduit bending it states to "multiply the shrinkage by 2" meaning in order to compensate for both sides of the bend. Can you please comment on this?
not an electrician but I took geometry. If you look at the first 2 bends (from the start of the 1st bend to the top of obstruction) the center line distance of the tube is 12.14 inches. The projection of this section onto the floor is 11.389 inches long or 0.751 inches less. If you ant 40 inches from the start to the top of the obstruction, you add this to the measurement. So, if from say box to box you wanted distance x you would have to add 2 * "shrink" to the total length x. But now also.... the center line distance of the tube for one 22.5 deg bend plus the straight section is 10.4 inches, not 10 which appears to be the amount the center is off in the demo. Don't know how you would do that without a scientific calculator though.
It's the best method, push thru, just remember S N A. star, notch, arrow. Get your measurements ( I use a pipe bending app cause it's easy) the make your first bend on the star, push thru to the next bend and spin 180, then bend at notch, then same thing at arrow. All bends are 22.5, 45, 22.5
Yes, just make sure that you don’t forget your strapping distances. Them inspectors are assholes in commercial. They’ll put a three point saddle in their dam measuring tape to measure that conduit on you.
Best explanation I’ve found regarding this topic. Clear and understandable. Thank you.
Very good explanation.
Good teaching. Good job
Outstanding ❤ 1/2"EMT is more forgiving 😅
In my NCCER textbook on conduit bending it states to "multiply the shrinkage by 2" meaning in order to compensate for both sides of the bend. Can you please comment on this?
not an electrician but I took geometry.
If you look at the first 2 bends (from the start of the 1st bend to the top of obstruction) the center line distance of the tube is 12.14 inches. The projection of this section onto the floor is 11.389 inches long or 0.751 inches less. If you ant 40 inches from the start to the top of the obstruction, you add this to the measurement. So, if from say box to box you wanted distance x you would have to add 2 * "shrink" to the total length x.
But now also.... the center line distance of the tube for one 22.5 deg bend plus the straight section is 10.4 inches, not 10 which appears to be the amount the center is off in the demo. Don't know how you would do that without a scientific calculator though.
Multiply by two if is a 30 degree every degree has a different multiplier
Can you answer a question regarding a 3-point saddle using the push through method?
It's the best method, push thru, just remember S N A. star, notch, arrow. Get your measurements ( I use a pipe bending app cause it's easy) the make your first bend on the star, push thru to the next bend and spin 180, then bend at notch, then same thing at arrow. All bends are 22.5, 45, 22.5
awesome
Is that same formula on the bender
The level only works if you know your floor is truly flat, which most aren’t, especially in old worksites.
Can you do a 3 point saddle over another conduit
Parallel
Yes, just make sure that you don’t forget your strapping distances. Them inspectors are assholes in commercial. They’ll put a three point saddle in their dam measuring tape to measure that conduit on you.
From a UK spark - what a load of nonsense.