4" Square Box

[mstrlucky74]

Are they made with 1-1/4" ko's?

I only see these.

http://www.hubbell-rtb.com/p-10-4-in-square-welded-boxes-2-18-in-deep-with-conduit-kos

 

[GoldDigger]

That link seems to be broken. Possibly that Hubbell site does not allow deep linking?

 

[Ponchik]

The link worked for me. But it does not look like they make a box with 1.25" KO.

Why not create your own KO?

 

[GoldDigger]

The link worked for me. But it does not look like they make a box with 1.25" KO.

Why not create your own KO?

It is very difficult to create a KO without heavy duty presses. Why not just create a hole? :angel:

 

[Dennis Alwon]

Generally you do not see 1 1/4" conduit go into a 4" sq. box as it would not meet the bend requirements

 

[jumper]

I have only seen 4 11/16" boxes with 1 1/4" knockouts.

 

[Ponchik]

It is very difficult to create a KO without heavy duty presses. Why not just create a hole? :angel:

All right. If you don't carry the heavy presses in your truck you can always Create a hole.

 

[mstrlucky74]

Thanks

 

[jxofaltrds]

If you increased a knock out would you still have the complete solid surface area to maintain:

"?600V Per UL 514-A, suitable for use without a bonding jumper in circuits up to 600 volts"

???

 

[Ponchik]

If you increased a knock out would you still have the complete solid surface area to maintain:

"?600V Per UL 514-A, suitable for use without a bonding jumper in circuits up to 600 volts"

???

I am sure it will be OK.

 

[jxofaltrds]

I am sure it will be OK.

I'm glad that you are.

Want to bet that it was listed/tested with only fittings that can be applied as designed?

 

[Ponchik]

I'm glad that you are.

Want to bet that it was listed/tested with only fittings that can be applied as designed?

No I don't want to bet on the listing issue, because I may lose.

I am not disagreeing with the listing.

What I am saying is in reality (out in the field) if I enlarge the KO to 1.25" and there is a fault, the breaker will open with out any issues. And I can bet $2, two slices of pizza and (1) beer.

 

[jxofaltrds]

No I don't want to bet on the listing issue, because I may lose.

I am not disagreeing with the listing.

What I am saying is in reality (out in the field) if I enlarge the KO to 1.25" and there is a fault, the breaker will open with out any issues. And I can bet $2, two slices of pizza and (1) beer.

There we agree. I bet it would trip also.

 

[don_resqcapt19]

If you increased a knock out would you still have the complete solid surface area to maintain:

"?600V Per UL 514-A, suitable for use without a bonding jumper in circuits up to 600 volts"

???

As long as the shoulder and locknut of the fitting is touching the flat part of the enclosure, you have the same ground fault path as you would have with a box that had the correct size knock out.

 

[cal1947]

Tofer 1947

Tofer 1947

Are they made with 1-1/4" ko's?

I only see these.

http://www.hubbell-rtb.com/p-10-4-in-square-welded-boxes-2-18-in-deep-with-conduit-kos

Why not a four and 11/16 box two inches deep or a 4 x4 j. Box you can get just about any depth

 

[Ponchik]

Get one of these.

http://www.garvinindustries.com/ele...1-16-square-junction-boxes/welded/72181-1-1-4

everybody will be happy including the OP.

 

[jxofaltrds]

As long as the shoulder and locknut of the fitting is touching the flat part of the enclosure, you have the same ground fault path as you would have with a box that had the correct size knock out.

Exactly my point! TY Don. I doubt if that is possible with a 1 1/4" knock out.

Now would a larger fitting actually have the same contact surface do to its increased size? Maybe/maybe not.

 

[kwired]

Generally you do not see 1 1/4" conduit go into a 4" sq. box as it would not meet the bend requirements

And if you only have small conductors, you probably have overfill in the box long before the raceway is full. Just did a quick calc with 1.25 EMT and 14 THHN/THWN- should be able to pull 61 conductors in it. You could pull them through a 6x6x4 box but if you were to splice all of them you would not have enough volume in that box.

 

[ActionDave]

And if you only have small conductors, you probably have overfill in the box long before the raceway is full. Just did a quick calc with 1.25 EMT and 14 THHN/THWN- should be able to pull 61 conductors in it. You could pull them through a 6x6x4 box but if you were to splice all of them you would not have enough volume in that box.

That is what I think too. Why would you ever need a 1 1/4 ko in a 1900 box?

 

[don_resqcapt19]

Exactly my point! TY Don. I doubt if that is possible with a 1 1/4" knock out.

Now would a larger fitting actually have the same contact surface do to its increased size? Maybe/maybe not.

Mike,
My point is that if the fitting and locknut fit in the box, that fitting and locknut will have the same contact area as where used with a box that has the correct size KO. This assumes that the surface is flat and that the shoulder or locknut of the fitting is not an a "curved" part of the enclosure wall. This could be an issue for boxes that are of "stamped" construction, but not for boxes of "welded" construction.