EMT connector with extra-long threads

Status
Not open for further replies.
S

SceneryDriver

Senior Member
Location
NJ
Occupation
Electrical and Automation Designer
I have to terminate 1/2" EMT in several fiberglass boxes. I need to use bonding bushings as the box is non-metallic, but the bonding bushings won't have enough thread to catch due to the thickness of the enclosure wall. I found these, but of course I can't find anyone who wants to sell me less than a case of (250). I need four fittings.

https://www.bptfittings.com/store/1-2-raintight-compression-connector-with-extra-long-threads.html

I doesn't even need to be a compression/raintight fitting. It's in a dry location; the fiberglass boxes are only being used for RF transparency (WiFi device installed inside).


Thanks,

SceneryDriver
 
SceneryDriver said:
I have to terminate 1/2" EMT in several fiberglass boxes. I need to use bonding bushings as the box is non-metallic, but the bonding bushings won't have enough thread to catch due to the thickness of the enclosure wall. I found these, but of course I can't find anyone who wants to sell me less than a case of (250). I need four fittings.

https://www.bptfittings.com/store/1-2-raintight-compression-connector-with-extra-long-threads.html

I doesn't even need to be a compression/raintight fitting. It's in a dry location; the fiberglass boxes are only being used for RF transparency (WiFi device installed inside).


Thanks,

SceneryDriver
Click to expand...
Change to rigid just outside the box and use a nipple. The rigid to emt fitting should be common enough.
 
ptonsparky said:
Change to rigid just outside the box and use a nipple. The rigid to emt fitting should be common enough.
Click to expand...

I thought about doing that, and I still may end up going that way. I was hoping for a slightly more elegant solution than "connector salad."


Thanks,

SceneryDriver
 
luckylerado said:
This is a new one for me. Pease explain.
Click to expand...
My guess is the figerglass box isn't much of an RF shield for WiFi equiment installed inside. Use a metallic box and you shield the signal, possibly to the point you need to utilize an external antenna.
 
SceneryDriver said:
I have to terminate 1/2" EMT in several fiberglass boxes. I need to use bonding bushings as the box is non-metallic, but the bonding bushings won't have enough thread to catch due to the thickness of the enclosure wall. I found these, but of course I can't find anyone who wants to sell me less than a case of (250). I need four fittings.

https://www.bptfittings.com/store/1-2-raintight-compression-connector-with-extra-long-threads.html

I doesn't even need to be a compression/raintight fitting. It's in a dry location; the fiberglass boxes are only being used for RF transparency (WiFi device installed inside).


Thanks,

SceneryDriver
Click to expand...



Just use the grounding bushing without the locknut. I would suggest you try the connector with the grounding bushing to see if the bushing holds the connector snug against the PVC box.
 
kwired said:
My guess is the figerglass box isn't much of an RF shield for WiFi equiment installed inside. Use a metallic box and you shield the signal, possibly to the point you need to utilize an external antenna.
Click to expand...

Exactly correct. The WiFi device doesn't have, and can't be fitted with, an external antenna. Thus, I need a fiberglass (RF-transparent) enclosure.



SceneryDriver
 
Jamesco said:
Just use the grounding bushing without the locknut. I would suggest you try the connector with the grounding bushing to see if the bushing holds the connector snug against the PVC box.
Click to expand...

I was under the impression I couldn't use the grounding bushing as the means to secure the fitting to the enclosure; I though I had to use the locknut, as well as the grounding bushing. Have I been misinformed all these years (wouldn't be the first time)?


SceneryDriver
 
SceneryDriver said:
I was under the impression I couldn't use the grounding bushing as the means to secure the fitting to the enclosure; I though I had to use the locknut, as well as the grounding bushing. Have I been misinformed all these years (wouldn't be the first time)?


SceneryDriver
Click to expand...

No, I think you got it right the first time. Manufacturers wouldn't supply the lock nut if it wasn't necessary.
 
I have access to a CNC laser cutter here at work, so I just made my own bonding washers from 18ga steel. Problem solved. And yes, I do realize I'm a little spoiled by having access to that machine.

bonding washer.jpg


SceneryDriver
 
SceneryDriver said:
I have access to a CNC laser cutter here at work, so I just made my own bonding washers from 18ga steel. Problem solved. And yes, I do realize I'm a little spoiled by having access to that machine.

View attachment 19676


SceneryDriver
Click to expand...
Some "definite purpose" non metallic enclosures may already have a similar feature built into them.

Most general purpose enclosures will not though.
 
Status
Not open for further replies.
Top