TC code reference [RE-wrenches]

[William Miller]

Matt:

I have a few questions as I try to ratify my decision, or not:

At 02:54 PM 2/3/2003 -0800, you wrote:
>
>To clarify:
>
>Tray cable is permitted under 336 & 340.10.
>

336.10 Uses Permitted.
Type TC tray cable shall be permitted to be used in the following:  
(1) For power, lighting, control, and signal circuits.
(2) In cable trays, or in raceways, or where supported in outdoor locations
by a messenger wire.
(3) In cable trays in hazardous (classified) locations as permitted in
Articles 392, 501, 502, 504, and 505 in industrial establishments where the
conditions of maintenance and supervision ensure that only qualified
persons service the installation.
(4) For Class I circuits as permitted in Article 725.
(5) For non–power-limited fire alarm circuits if conductors comply with the
requirements of 760.27.
(6) In industrial establishments where the conditions of maintenance and
supervision ensure that only qualified persons service the installation,
and where the cable is continuously supported and protected against
physical damage using mechanical protection, such as struts, angles, or
channel, Type TC tray cable that complies with the crush and impact
requirements of Type MC cable and is identified for such use shall be
permitted between a cable tray and the utilization equipment or device. The
cable shall be secured at intervals not exceeding 1.8 m (6 ft). Equipment
grounding for the utilization equipment shall be provided by an equipment
grounding conductor within the cable.
(7) Where installed in wet locations, Type TC cable shall also be resistant
to moisture and corrosive agents.
FPN: See 310.10 for temperature limitation of conductors. 


336.12 Uses Not Permitted.
Type TC tray cable shall not be used in the following:  
(1) Installed where it will be exposed to physical damage
(2) Installed as open cable on brackets or cleats, except as permitted in
340.10(6)
(3) Used where exposed to direct rays of the sun, unless identified as
sunlight resistant
(4) Direct buried, unless identified for such use


Does this fall under the "power, lighting and control"?  Outdoor use
requires a messenger.

ARTICLE 340 Underground Feeder and Branch-Circuit Cable: Type UF

Is TC Cable the same s UF?

>
>In my experience, every piece of tray-cable I've ever touched has been
>multi-conductor.  If they even made a small-conductor configured TC, it
>would not be allowed due to the sheathing, as I understand it.
>Furthermore, buying such an animal would be hard to find and probably
>2-3 times as expensive.
>

I must have used a different cable, it was single conductor.  Here is where
I found it:

http://www.bpsolar.com/ContentDocuments/84/MC%20Wire%20Kit%20diagrams.pdf

According to the above, it's RHW-2.  I've seen samples of multi-conductor
TC cable.  How in the world do you seal this into a j-box, being not round?

Thanks,

William

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William Miller
Miller Power and Communications
PO Box 50, Santa Margarita, CA 93453
Voice :805-438-5600     Fax: 805-438-4607	
email: wrmiller at slonet.org
http://millerpowerandcomm.com
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