EMT conduit connectors are too small

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  #1  
Old 01-10-21, 12:32 AM
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EMT conduit connectors are too small

I bought some of these connectors to use with 1/2" EMT conduit. They fit on the conduit alright, but they fall right through the 1/2" (7/8") knockouts in my light fixtures and j-boxes. Am I doing something stupid? Are electrical fittings arcane and ridiculously complicated like plumbing? Or, are the designers and manufactures of these things incompetent jerks?



https://www.acehardware.com/departme...ectors/3183126 Sigma Electric ProConnex 1/2 in. Dia. Die-Cast Zinc Set Screw Connector For EMT
 
  #2  
Old 01-10-21, 01:20 AM
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It sounds like you're using the 3/4" knockouts.
Those connectors fit 1/2" ko's just fine.
 
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Old 01-10-21, 04:15 AM
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All the j-boxes I bought said they have 1/2” KOs only. The actual size of all the KOs is 7/8”, which, as far as I can tell from the web is the real size of a 1/2” KO. The connectors slip right through. Completely useless. Are there special j-boxes I don’t know about that have smaller holes?
 
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Old 01-10-21, 06:27 AM
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The boxes are wrong not the connectors.
 
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Old 01-10-21, 06:59 AM
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I have never seen an EMT connector that does not fit the box correctly. I have seen some that are a little sloppy but not ones that go through the hole. Perhaps you got a bad batch.

Please post some pictures.
 
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Old 01-10-21, 07:00 AM
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A 1/2 connector needs a 7/8 hole. Can you post a picture?
 
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Old 01-10-21, 07:21 AM
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You did say all the holes are 7/8, but some boxes mix 1/2 and 3/4 KOs.
 
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Old 01-10-21, 07:58 PM
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I know a picture is worth 1000 words, but I've returned the connectors, so no pictures. You'll just have to believe me or go to the hardware store yourself. I measured the holes. They are all 7/8". The flange on the connectors is slightly less than 7/8". The connectors fall through the knockouts. The only way to make these connectors work is to use a washer or additional nut outside the boxes and fixtures. That would be ridiculous. I have to conclude that the designers and manufactures of these things indeed incompetent jerks, or the connectors are designed for some other purpose, or they are for some country where 1/2" knockouts are smaller than 7/8".

I'm going to try some of these instead:


Halex 1/2" EMT Set-Screw Connector
https://www.homedepot.com/p/Halex-1-...6270/100137321
 
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Old 01-11-21, 04:46 AM
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The connectors fall through the knockouts. The only way to make these connectors work is to use a washer or additional nut outside the boxes and fixtures.
Those connectors come with (or should come with) the screw on nut (ring nut). The picture indicates the hut as it shows it on the picture. That nut is to be unscrewed off the connector first, then the connector placed through the hole in the box and then that nut to be screwed back on to the connector inside the box. That nut holds the connector securely to the box by code. Maybe the ones you bought did not come with that ring nut which is clearly seen in the picture.
The red arrow shows the ring nut that should come with the connector





 
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Old 01-11-21, 06:14 PM
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I think you missed where I wrote that the flange is too small. Of course I was using the nut on the inside of the boxes. I remain astonished that this item was designed, manufactured, distributed, and sold. Civilization is doomed.
 
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Old 01-11-21, 06:49 PM
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I install hundreds of EMT connectors every year using different brands (Halex, Steel City, Raco, etc) and materials (steel, zinc). I have never had a connector that would pass through a properly sized KO.
 
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Old 01-11-21, 07:11 PM
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Apparently no one believes me! What a mistake not getting photographic evidence.
 
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Old 01-11-21, 07:18 PM
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What a mistake not getting photographic evidence.
I agree. I would have loved to see them.
 
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Old 01-11-21, 07:50 PM
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I thought you had the wrong size holes so I pulled out a box and measured the holes. You have the correct size holes. They must be some cheap offshore fittings that they sold you. Did they even fit the conduit properly?
 
  #15  
Old 01-11-21, 07:51 PM
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The KO holes are cut with both 1/2" and 3/4" circles for the same hole and it's up to you to punch the proper size. You removed the larger one?
​​​​​​
or possibly, you bought a bag of 3/4" set screw connectors from a big box store that was an return item put back on the shelf where someone had previously mixed in wrong connectors for refund. This happens a lot at big box stores, I always get unopened bags and boxes so I won't accidentally pick up defective or incorrectly returned stuff.
 
  #16  
Old 01-12-21, 03:33 AM
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I think you missed where I wrote that the flange is too small. Of course I was using the nut on the inside of the boxes.
My reply was based on the fact that if the connectors were the proper ones and you were using boxes with the correct size holes and they still went thru the hole I had to assume then maybe you were not using the "nut" that comes with it or maybe the ones you bought did not have the nut on them.

The other fact also that someone mentioned. Many of the metal boxes have holes that are 1/2 and 3/4". These have punch outs where one hole depending on the material you punch out could be used as a 1/2 or 3/4". This is the only other thing I could think of. Or maybe you just did not get the proper connectors.

It is very strange and odd that those connector did not fit.
 
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Old 01-14-21, 05:42 PM
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I remain astonished that this item was designed, manufactured, distributed, and sold. Civilization is doomed.
hahahahahahahaha......I suspect you maybe confused some setscrew flex connectors for 1/2" EMT connectors. Perhaps maybe a 3/8" flex connector?
 
 

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