[mwr]

I hope this isn't a taboo subject like pretwisting before using a wirenut...

At work today we almost had a knock down drag out fight over knockout seals.

What is the proper way to install a 1/2" knockout seal like this, from the inside of the box with the tabs to the outside or with the tab inside the box?:

I will say I got chewed out for installing a few today from the inside of the box.. Im looking to either come back tomorrow with some good ammunition or admit defeat by reading your responses.

 

[Pete m.]

Thats a good question. FWIW, I have always installed them from the outside in. And, I will add that I flattened the "ears" out... most of the time.:whistling2:

There probably is a "listing" thing that goes along with them but I've never been that anal.

Pete

 

[Tsmil]

From the outside. Keep it visibly clean.

 

[ponyboy]

Or you could throw that garbage away and use the Hoffman ones with a stud and wingnut.

But yeah I've always installed those things from outside in

 

[cultch]

I always went outside but come to think of it it would be easier to flatten the edges the other way around. Of course if you can just semi flatten about 2 of the lil flanges you should be gold.

 

[wildleg]

if it's visible, sure. if it's in a clg or electric room, who the hell cares.

 

[Tsmil]

If installed from the inside, it is possible to dislodge it and it will fall into the box or cabinet. From the outside, it can be removed but it does not fall in. Nothing like trying to remove something that has lodged in the mechanism of a disconnect.

 

[mwr]

Doesn't look I will have a leg to stand on with those responses. FWIW I was installing from the inside of ceiling fixture box, teeth are not flattened obviously... the only way to get at the outside of the box was thru an attic.

I refused to remove them though. Should I be doing so with either nec, installation instructions or safety in mind? And if so, please explain how omne would seal a knockout when they cant fish thriu blown in insulation to find the box on the other side?

 

[Rollie73]

I've seen one that was installed from the inside of a 600 volt/225 A panel......or at least what was left of it when the dumbassed maintenance guy stepped on top of the panel while trying to reach something off of a 6' ladder.

You guessed it......the KO filler fell down inside the panel under the weight of his foot....bet he crapped his pants with that bang.:laughing:

 

[sbrn33]

Or you could throw that garbage away and use the Hoffman ones with a stud and wingnut.

But yeah I've always installed those things from outside in

Makes sense. Use a $12 item instead of a 30 cent one.

 

[ponyboy]

Makes sense. Use a $12 item instead of a 30 cent one.

Those things are $12?!? Holy crap. I was only halfway serious.

 

[Awg-Dawg]

FWIW I was installing from the inside of ceiling fixture box, teeth are not flattened obviously... the only way to get at the outside of the box was thru an attic.

That's how I would have done it.

 

[sbrn33]

Those things are $12?!? Holy crap. I was only halfway serious.

Yea, funny thing is sometimes it is cheaper to buy a new box. Crazy.

 

[Pete m.]

That's how I would have done it.

Hack!!:laughing::jester:

Pete

 

[cultch]

Makes sense. Use a $12 item instead of a 30 cent one.

GD are you serious? My last company would have the wing nut ones all the time. Guess no one ever looked it up. I'm out before I start bitching about that company again. I'd never seen them before then.

 

[ponyboy]

Yea, funny thing is sometimes it is cheaper to buy a new box. Crazy.

I'm often forced to move or reuse old gear and damn the cost but I really prefer the Hoffman ones for larger holes like over 2". Laser dust and field mice are crafty

 

[Tsmil]

Sorry, just have to ask.... Why did you install a box without filling them first?

 

[sbrn33]

Oh you are right they are much nicer. Especially in an industrial environment.
I actually stock the arlington plastic nema 1 KO seal in all sizes now. They are the ****.

 

[Big R]

Or you could have just used this

 

[mwr]

Does anyone know where I can find installation instructions from the manufacture on those things....?

I need something, anything to back me tomorrow otherwise I will have a miserable day?

And again, with safety in mind, should I eat crow and pull them out of the boxes?