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#162497 04/20/07 10:35 AM
Joined: May 2003
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badgers Offline OP
Junior Member
in a 2&1/8" steel box can I get an 1&1/4" conduit KO?
is there any code section dealing with this.

I see that a 4&11/16 box that is 2&1/8" deep can do it but that is a bigger hole in the wall then I want.
thanks

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badgers #162498 04/20/07 10:40 AM
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badgers Offline OP
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This is a request from the IT data specialist.
because I know someone will ask why.
I did..

badgers #162501 04/20/07 11:31 AM
Joined: May 2005
Posts: 984
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Member
No. But it may not be because of a Code issue. If there's no market for a product, nobody will make it. If it's impractical or physically impossible to make, nobody will make it either.

But then IT folks regularly ask for things that don't exist.
I think it comes from spending more time in cyberspace than in the real world.
Send them a copy of the Appleton catalog and tell them to pick out what they want.
If it's not there, 2 possible courses of action remain:

have it made (with enough money you can get just about anything fabricated and UL Listed)

Change the laws of Physics to allow a hole that's larger than the metal that it's drilled in...like a 1.5" hole in the side of a 1.25" deep box. (The Star Trek fans will remember that even Scotty "cannot change the laws of Physics".)


Ghost307
ghost307 #162508 04/20/07 11:59 AM
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There is nothing to keep you from punching a bigger hole. I assume this is so they can pull a DB9 through it with the shroud in place. We used to take the shrouds off but you need a cable that doesn't have the molded connector for that.
Plastic boxes make this operation easier since you can use a $3 hole saw instead of a much more expensive KO punch. I have seen IT managers, with too much time on their hands, cutting holes in boxes with a Dremel tool. I figure those holes cost the company about $50 each.


Greg Fretwell
badgers #162527 04/20/07 06:08 PM
Joined: Feb 2002
Posts: 375
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Member
You can make up a custom box. No UL listing is required.

George #162529 04/20/07 06:22 PM
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Moderator
In the past I have had prints that called for a 2" EMT run to a 2 gang box so the IT folks could bring their cables out to office cubes.

As that is all but imposable all I did was provide a 2 gang extension ring and run the 2" EMT down to it with a bushing.

The IT folks found this more than adequate.



Bob Badger
Construction & Maintenance Electrician
Massachusetts
iwire #162624 04/22/07 03:56 PM
Joined: Jun 2004
Posts: 1,273
T
Member
I've installed cases of this mythical product.

It is made in the 4-11 trade size box... side bracketed or without.

You'll get one or two KO's on each box side.

We use it exclusively for data cable chases into furniture feeds.


Tesla
Tesla #162627 04/22/07 05:30 PM
Joined: Dec 2003
Posts: 886
H
Member
I see that a 4&11/16 box that is 2&1/8" deep can do it but that is a bigger hole in the wall then I want.

Both the 1900 and the 4-11/16 require a plaster ring. Last I looked the wall opening is going to be the same.

Come clean. YOU are the IT guy aren't you.

-Hal

gfretwell #163002 04/28/07 10:18 PM
Joined: May 2005
Posts: 247
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Originally Posted by gfretwell
I assume this is so they can pull a DB9 through it with the shroud in place.


There is no such thing as a DB9..

The correct designation for the 9 pin D-subminiature connector is DE-9. The second letter designates the connector shell size.
Using the standard #22 contacts, the sizes are DA-15, DB-25, DC-37, DD-50, and DE-9.

Other inserts are available, such as DB-13W3 (3 coax or high-voltage contacts + 13 #22 pins, used for older Sun monitors.)

source: ITT/Cannon D-subminiature connector catalogs, 1947-present. (my copy is a 1971 printing of a 1969 edition, which agrees with the current pdf version.)

Other common errors are RJ-45, which actually designates a specific connector, wired in a specific wiring pattern, for a specific telephone application having nothing in common with Ethernet. (if you use the specified connector, it not only won't fit into an Ethernet jack, but the wiring will have no wires in common with Ethernet.)

source: 47 CFR 68.502

techie #163027 04/29/07 12:20 PM
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Quote
Other common errors are RJ-45, which actually designates a specific connector, wired in a specific wiring pattern, for a specific telephone application having nothing in common with Ethernet. (if you use the specified connector, it not only won't fit into an Ethernet jack, but the wiring will have no wires in common with Ethernet.)


I agree you can't plug an ethernet cable into a telephone jack and expect it to work but the wiring of the cables are the same. Aren't T568A/B AT&T specs? When I look in my Western Electric Registration Service Manual I see the RJ 45s defined as
1 n/c
2 n/c
3 MI
4 ring
5 tip
6 MIC
7 PR
8 PC

4&5 is a pair
3&6 is a pair
1&2 is a pair
7&8 is a pair
What wire would be different for ethernet?

I agree the term "RJ45" refers to a particular connection setup in the jack with a programming resistor on the 7/8 pair (RJ41S adds a pad on pair 1/2)
but the wiring itself is the same. At a certain point, if we all know what we are talking about who cares? That is like getting pedantic about the use of the term "Romex" or "Bell Box".


Greg Fretwell
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