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Knock-Out Seals #122167
10/01/05 11:45 PM
10/01/05 11:45 PM
Admin  Offline
Joined: Oct 2000
Posts: 3,536
The gutter shown in this pic contains the main feed to a number of panels at a shopping center. Some extra holes were filled with.....some interesting 'plugs.' Anyone know what they were really intended to be used for?

- renosteinke
[Linked Image]

[Linked Image]

[This message has been edited by Webmaster (edited 10-02-2005).]

Tools for Electricians:
Re: Knock-Out Seals #122168
10/02/05 12:26 AM
10/02/05 12:26 AM
mxslick  Offline
Joined: Oct 2004
Posts: 803
Atomic City, ID USA
They look like the plugs plumbers use to seal lines for pressure/standing water testing.....

Someone got creative.... [Linked Image]

Stupid should be painful.
Re: Knock-Out Seals #122169
10/02/05 10:41 AM
10/02/05 10:41 AM
iwire  Offline
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
What an electrician that did not have any 4" square blanks?

Anyway I will go with slicks thought or maybe plugs to be used when heating PVC for bending?

Bob Badger
Construction & Maintenance Electrician
Re: Knock-Out Seals #122170
10/02/05 10:43 AM
10/02/05 10:43 AM
iwire  Offline
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
By the way I would also say they where punched out for either pulling or feeding the wires in the opposite pipes.

The folded one also.

[Linked Image]

Bob Badger
Construction & Maintenance Electrician
Re: Knock-Out Seals #122171
10/02/05 05:39 PM
10/02/05 05:39 PM
tkb  Offline
Joined: Dec 2004
Posts: 94
These are T&B Push-Penny® Plugs.
I thought they were for plugging conduits. I never saw them used as KO blanks.

Plug, Conduit, Connectors (Push Penny® Plugs)

Economically seal out grout and plaster from
any fitting or raceway conforming to CSA
dimensional tolerances. Made of flexible plastic,
they push into place and are held fast by
pressure against internal surface of fitting or
raceway. Eliminates need for separate capped
bushing or steel penny and bushing.


[*] To plug open end of conduit or connector
in order to prevent ingress of
trash, dirt or moisture during construction
and remodeling.


[*] Wide range of application; can be
used with rigid metal conduit, intermediate
metal conduit, electrical
metallic tubing, all connnectors and
all bushings.

[*] Designed to stand up to normal
handling and is functionally unaffected
by moisture.

Standard Material

Standard Finish
As molded

Listed/Certified by:
CSA (LR2884, LR4484)

Conforms to:
U.L. 514B
CSA C22.2 No. 18
NFPA 70-1999 (ANSI)

Push-Penny® Plugs

Cat# Size
1470 1/2"
1471 3/4"
1472 1"
1473 1-1/4"
1474 1-1/2"
1475 2"
1476* 2-1/2"
1477* 3"
1478* 3-1/2"
1479* 4"
* Not CSA Certified
CSA File No. 2884
UL not applicable

[This message has been edited by tkb (edited 10-02-2005).]

Re: Knock-Out Seals #122172
10/03/05 10:43 AM
10/03/05 10:43 AM
sandsnow  Offline
Joined: Sep 2004
Posts: 167
Irvine, CA, USA
I wonder how many younger electricians would know what a "penny" is when used in electrical context?

Larry LeVoir
City of Irvine, CA
Re: Knock-Out Seals #122173
10/03/05 02:46 PM
10/03/05 02:46 PM
jfwayer  Offline
Joined: May 2005
Posts: 30
Fairmont, WV, USA
it's easy, a penny is a high current fuse link that is usually protected by the wiring in case of a fault

Re: Knock-Out Seals #122174
10/03/05 06:54 PM
10/03/05 06:54 PM
electure  Offline

Joined: Dec 2000
Posts: 4,279
Fullerton, CA USA
"The penny" has been replaced by "The ductape" in the minds of younger guys I think, Larry.


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