How To Make A Box Offset Bend
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- Опубликовано: 11 янв 2016
- Here is the link to the IDEAL Conduit Bender product page. www.idealind.com/us/en/shop/p...
Electrician's use a Box Offset bend anytime they need to feed an electrical box with conduit. it is one of the more basic bend they make just about every day of the week. I'll step you though how to make one.
In this video I will show you one way to make a Box Offset Bend in a ½ inch EMT conduit using a hand conduit bender from IDEAL.
A Box Offset Bend is needed anytime an electrician needs to feed an electrical box with a piece of conduit. The knockout on the electrical box is not flush with the back of the box hence the conduit must be bent slightly so it can be inserted into the conduit fitting attached to the box. This allows the conduit to be mounted properly to the wall without putting undue stress on the conduit fitting.
For this demonstration I will use our catalog number 74 - 026 Ductile iron head bender from IDEAL. The ductile iron head benders are typically preferred by the professionals as they will last longer than aluminum bender heads which are lighter weight but less durable.
Generally a 10° offset Bend is used to create this box offset. If you remember my video on offset bends a certain shrink amount and a multiplier is used to create the offset.
On 10° offset bends the shrink amount is 1/16 of an inch for every inch of obstruction and the multiplier is six which is used to calculate the distance between the two bends I need to make.
On a typical electrical box the knockout is about 3/8 of an inch away from the back of the box which becomes the height of the obstruction we need to overcome. Six times 3/8” is 2 ¼” which becomes the distance between the two bends on the conduit I will make. The shrink amount is so small it is not a factor.
To make the box offset on the end of a piece of conduit I will make two marks.
Step one is to make the 1st mark at about 2 ½ inches from the end of the conduit. If I make the mark any closer to the end of the conduit the hook of the bender head may deform the round shape of the end of the conduit and not fit inside the conduit fitting on the box.
Contractors generally use a pencil to mark the conduit so it can be erased later. In my example I will use a permanent marker and mark the conduit all the way around so the mark will not get lost in the conduit head when bending.
For the 3/8” offset we calculated the distance between bends to be 2 ¼ inches. So I’ll make a second mark 2 ¼” away from the first mark and mark the conduit all the way around.
Offset bends are done in the air not on the ground. Simply stand the bender with the handle pointing down and bender head closer to you.
Step two is to insert the conduit into the bender head and lineup the first mark with the arrow on the bender head. Bend your knees to lower your center of gravity and place 1 foot up against the bender handle to keep it from slipping. Then using constant pressure close to the bender head, bend the conduit to the 10° mark. The bottom of the conduit will be even with the mark.
Step three is to slide the conduit down to the second mark and line it up with the arrow on the bender head. Rotate the conduit 180° and align the first bend with the second bend sighting down the bender handle. Then bend the conduit to 10° again.
This creates the box offset in the conduit that allows it to easily slide into the conduit fitting on the box.
Knowing how to make a box offset bend quickly and efficiently will make those jobs run that much smoother and add value to what you can do.
Electricians don’t bend the conduit and then cut it to the correct length. Once they know how to use a bender correctly the conduit is the correct length for the job. Using a good quality hand conduit bender like this one from IDEAL will provide accurate and professional looking bends that electricians expect while on the job.
If you want to learn more about the line of hand conduit benders from IDEAL. Please visit our website or contact our customer service department to find a local distributor.
Thanks for watching folks I’m Ron with IDEAL and see you on the next one.
#RonKipperFromIDEAL #IDEALINDUSTRIES #IDEALConduitBenders
As an apprentice thank you for this! I'm not too good at doing things by eyeballing and thats the only way people have been teaching me. No one knew what the marks or shrink or anything was so i was pretty confused on what exactly was going on. Now that i know the right numbers i can practice this alot easier and hopefully get the muscle memory to do it without the marks. Thanks for the video!
This is fantastic. I'm a DIY guy attempting to run conduit in my basement. This will allow me to make a semi-professional looking installation.
I am a first year electrical student and we’re going over conduit bending this week. I have been struggling with box offsets the most and this video was very helpful, thank you~!!
Great presentation. I am a retired journeyman electrician but I always enjoy these videos which kind of help me remember how much fun I had being an electrician. My specialty was heavy industrial and loved working and troubleshooting motor control circuits as well as VFD's.
Watching some people explain things was like watching paint dry compared to this video, very upbeat and helpful!
Thanks for the info. After pricing out all the little fittings to do a large (for me) project in my basement, I figured it would be cheaper to just buy a bender. Too bad it didn't come with instructions. I'm going to be making about 16 offset bends like you just demonstrated and this was exactly what I needed.
Thank you for this video. As an apprentice I kept being told to eye it and it wasn't working out for me.
On the job, watching your video as I bend the conduit. Man, I love these types of videos.
1st year apprentice out of Local 606 in Florida. This was a great video to cement box offsets in my head. First conduit bending practical tomorrow. Thank you so much!
Great video. I do industrial and commercial CCTV installations (mainly outdoors), I install EMT extensively for work, this video is helpful even for someone with experience doing EMT bends. Thanks.
Love it! Thank you! I am very loyal to Ideal products as I've grown up in Sycamore!
I'm currently enrolled for an electrician course and enjoy your videos
Been years since I've done this and forgot...ON THE JOB! Saved my rear Ron, thanks!
You are a great teacher. I did what you said and of course it worked perfectly. Thanks for sharing your knowledge.
This was exactly what I was looking for. This was a better explanation than the other guys videos. Subbed.
Great job Ron!Getting back in the trade and watching some videos.Thanks
Thanks for sharing this. Very helpful.
When I was in HVAC/R trade school the first part of the course work was all electrical....to the point where we had to bend emt that had to fit the instructors template. I wished I had remembered how to do all that
This is the most "ideal" video about conduit bending.
First day by myself as electrician specialized in alarm systems tomorrow (canada), thank you so much. I gotta do 2 conduits tomorrow. Easy bend path but haven't bend pipes in 3+ years