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#40914 - 08/09/04 08:08 PM Tapping NM  
electricman2  Offline
Member
Joined: Nov 2003
Posts: 269
Thomasville, NC USA
I have to tap a circuit using 12-2NM. The cable runs across ceiling joists and goes down into stud walls at both ends. The run is straight with no slack. I know I can use 2 j-boxes to do this, but does anyone know a better way. Is there a UL listed "flying tap" [Linked Image]


John

Work Gear for Electricians and the Trades

#40915 - 08/09/04 08:46 PM Re: Tapping NM  
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
Never used them, do not know what they cost but they are made.

[Linked Image]

Quote
Tap Connectors


The SC Tap Splice is used for splicing into an existing solid conductor 14/2 and 12/2 cable with ground. Stranded wire versions are available for 16/2, 14/2, and 12/2 wire. This provides the user the ability to add an additional branch line or add modular hookups in their products anywhere they are needed. The Molex Tap Splice is relatively small and fits into walls, floors, and ceiling cavities with ease. Once the Tap connector has been spliced into the cable, the branch line wire to a SC Power Splice Connector can be mated to the Tap.


www.molex.com

[This message has been edited by iwire (edited 08-09-2004).]


Bob Badger
Construction & Maintenance Electrician
Massachusetts

#40916 - 08/09/04 09:14 PM Re: Tapping NM  
CTwireman  Offline
Member
Joined: Feb 2002
Posts: 840
Connecticut, USA
A similar product to what Bob has shown is made by AMP. A simple inline tap costs around $3 wholesale. I have not used them either but I have spoke to people that have and apparently they are good.

Peter


Peter

#40917 - 08/10/04 09:35 PM Re: Tapping NM  
Haligan  Offline
Member
Joined: Feb 2004
Posts: 111
Berkeley, CA USA
I must be misreading this. Where in electricman's run would this tap splice doohickey go?


#40918 - 08/11/04 05:43 PM Re: Tapping NM  
shortcircuit  Offline
Member
Joined: Jun 2004
Posts: 608
massachusetts
Is this type of tap connector permitted to be buried in a wall, ceiling, etc...or must it be left accessible for servicing as a juction box would?


#40919 - 08/11/04 06:14 PM Re: Tapping NM  
cpal  Offline
Member
Joined: May 2004
Posts: 162
Cohasset MA
Amp has a product that will splice or in line tap NM BUT I'M PREETY SURE IT IS ONLY LISTED FOR MOBILE HOMES see this page http://catalog.tycoelectronics.com/...3&RQS=C~11621^P~52148^M~PROP^N~2^G~G
It mentions compliance with articles 545,550,and 551. I have a cut from the manufacture at work and as I recall it has limited uses. We originally looked into the AMP item regarding manufactured homes and connecting the branch runs when the modules where slid together.


IWIRE do you know what the listing restrictions are on the product you posted it would be nice to know if it is acceptable in all occupancies.

Charlie



[This message has been edited by cpal (edited 08-11-2004).]


#40920 - 08/11/04 09:13 PM Re: Tapping NM  
Joe Tedesco  Offline
Member
Joined: Oct 2000
Posts: 2,749
Boston, Massachusetts USA
545.13 Component Interconnections.

This section covers their permitted use in a special occupancy for Manufactured Buildings only.


Joe Tedesco, NEC Consultant

#40921 - 08/12/04 03:22 AM Re: Tapping NM  
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
Joe as these connectors are covered in 334.40(B) wouldn't they be allowable for all occupancy's that NM is allowed?

If not what section prohibits using these in standard dwelling units?

The 2003 UL white book section NONMETALLIC-SHEATHED CABLE INTERCONNECTORS (QAAV)references 1999 NEC Section 336.21 and Articles 545, 550 and 551.

336.21 is now 334.40(B)

Bob

[This message has been edited by iwire (edited 08-12-2004).]


Bob Badger
Construction & Maintenance Electrician
Massachusetts

#40922 - 08/12/04 07:24 AM Re: Tapping NM  
Joe Tedesco  Offline
Member
Joined: Oct 2000
Posts: 2,749
Boston, Massachusetts USA
Bob:

See 300.15 Boxes, Conduit Bodies, or Fittings — Where Required.

A box shall be installed at each outlet and switch point for concealed knob-and-tube wiring.

Fittings and connectors shall be used only with the specific wiring methods for which they are designed and listed.

Where the wiring method is conduit, tubing, Type AC cable, Type MC cable, Type MI cable, nonmetallic-sheathed cable, or other cables, a box or conduit body complying with Article 314 shall be installed at each conductor splice point, outlet point, switch point, junction point, termination point, or pull point, unless otherwise permitted in 300.15(A) through (M).

For a "Boxless Device" See also:

(E) Integral Enclosure. A wiring device with integral enclosure identified for the use, having brackets that securely fasten the device to walls or ceilings of conventional on-site frame construction, for use with nonmetallic-sheathed cable, shall be permitted in lieu of a box or conduit body.

FPN: See 334.30(C); 545.10; 550.15(I), 551.47(E), Exception No. 1; and 552.48(E), Exception No. 1.

NECH:

Structural components or modules are usually constructed in manufacturing facilities and then transported over the road to a building site for complete assembly of a structure, such as a dwelling unit, motel, or office building.

At the on-site location, approved wiring methods are used to interconnect two or more modules.

Exhibit 545.1 shows a type of nonmetallic-sheathed cable connector permitted for such interconnections.

Exhibit 545.1 A type of nonmetallic-sheathed cable connector used for interconnecting modules in a manufacturing building. (Courtesy of Pass & Seymour/Legrand®)

Courtesy: www.nfpa.org




[This message has been edited by Joe Tedesco (edited 08-12-2004).]


Joe Tedesco, NEC Consultant

#40923 - 08/12/04 03:56 PM Re: Tapping NM  
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
Hi Joe, thanks for the answer but I am still uncertain on this, doesn't 334.40(B)modify 300.15?

Quote
334.40(B)Devices of Insulating Material.
Switch, outlet, and tap devices of insulating material shall be permitted to be used without boxes in exposed cable wiring and for rewiring in existing buildings where the cable is concealed and fished. Openings in such devices shall form a close fit around the outer covering of the cable, and the device shall fully enclose the part of the cable from which any part of the covering has been removed. Where connections to conductors are by binding-screw terminals, there shall be available as many terminals as conductors.


If this does not modify the requirements of 300.15 what is this sections purpose?

Bob [Linked Image]

[This message has been edited by iwire (edited 08-12-2004).]


Bob Badger
Construction & Maintenance Electrician
Massachusetts

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