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Author Information Topic:   Double Stacking under a staple
Member

   
Name: Craig Spafford
Email: cspafford@pmmiintl.com
Location: Canada
Title: Manufacturer
In Trade Since: 1998
Registered: May 2002
Total Posts: 2

posted May 17, 2002 at 09:13 AM       Edit/Delete Message
Some people tell us that double stacking is not legal under the NEC, while others say that it depends on the local inspector as to whether it will be allowed.

What's the bottom line ?

IP: 205.206.39.85

Member

   
Name: Grant Rollins
Email: grollins@rexelusa.com
Location: Nevada
Title: Contractor/Distributor
In Trade Since: 1965
Registered: Oct 2001
Total Posts: 449

posted May 17, 2002 at 12:06 PM       Edit/Delete Message
There are staples UL-Listed for stacking (2) 14/2 or 12/2 romex cables. There is nothing in the NEC that would not allow this product to be used per it Listing. Be aware that all manufactures of staples do not not make this product. This goes along with the use of romex connectors that are also listed for more than one cable and often used at the loadcenter for termination of home runs, installing two cables per connector. You want to be sure and have the manufactures data from the box to show the AHJ since I don't think it is possible to look at a driven staple and know how it is listed.

IP: 12.18.100.210

Member

   
Name: Pete Baldauf
Email: pbaldauf@ci.vandalia.oh.us
Location: Ohio
Title: Inspector
In Trade Since: 1987
Registered: Feb 2002
Total Posts: 150

posted May 17, 2002 at 12:38 PM       Edit/Delete Message
Since there is no marking on the individual staples, what would stop someone from saving the box from a listed staple and presenting it to the AHJ each time he has an inspection even though he is using non-listed fasteners? Not everyone is as honest as the fine people who frequent this forum!!

IP: 206.21.13.51

Member

   
Name: Grant Rollins
Email: grollins@rexelusa.com
Location: Nevada
Title: Contractor/Distributor
In Trade Since: 1965
Registered: Oct 2001
Total Posts: 449

posted May 17, 2002 at 04:45 PM       Edit/Delete Message
Pete, typically the staples rated for a single cables are only 1/2" long and if used on two cables, very little effort is required to have them pop out. The staples rated for two cables I believe are 1" long. I guess if you keep seeing the same old box label over and over you might want to check a staple.

IP: 12.18.100.210

Member

   
Name: Harold Endean
Email: hendean@optonline.net
Location: New Jersey
Title: Inspector
In Trade Since: 1975
Registered: Oct 2001
Total Posts: 59

posted May 17, 2002 at 05:58 PM       Edit/Delete Message
Craig,

I feel that putting 2 wires under 1 staple is not a violation as long as the wires are not on end. If they both lay flat and you use a long enough staple to hold the wires and not cut into them, then I feel that it is a safe installation. There are products on the market that will allow you to stack the wires.

IP: 67.83.41.248

Member

   
Name: Harold Endean
Email: hendean@optonline.net
Location: New Jersey
Title: Inspector
In Trade Since: 1975
Registered: Oct 2001
Total Posts: 59

posted May 17, 2002 at 06:02 PM       Edit/Delete Message
Craig,

Just to clear up my last post. By installing 2 wires under 1 staple I meant to install them so that they are installed as per 336-18.

Harold

IP: 67.83.41.248

Member

   
Name: John J. Murphy jr.
Email: panamjack@msn.com
Location: Florida
Title: Electrician
In Trade Since: 1954
Registered: Jul 2001
Total Posts: 120

posted May 20, 2002 at 08:33 PM       Edit/Delete Message
there is a product out of arlington tex for stacking romex as man high as you wish it is ul approved for this see any copy of ECM magazine. regards

IP: 67.34.26.160

Member

   
Name: Craig Spafford
Email: cspafford@pmmiintl.com
Location: Canada
Title: Manufacturer
In Trade Since: 1998
Registered: May 2002
Total Posts: 2

posted May 21, 2002 at 10:15 AM       Edit/Delete Message
Thanks to all who wrote in-- I appreciate the feedback. We developed a stapling system (UL approved) for use with Romex, but were not sure on the double stacking issue. It seems that we can double stack with our staple gun, and will go to market with that in mind.

Thanks again !!!

IP: 205.206.39.101

Member

   
Name: David Neuman
Email: daveselectric@juno.com
Location: Ohio
Title: Electrician
In Trade Since: 1972
Registered: May 2002
Total Posts: 21

posted June 05, 2002 at 11:09 PM       Edit/Delete Message
Would not thhis be considered "BUNDLING"

IP: 65.43.212.225

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