Sunlight Resistant SO Cord [RE-wrenches]

[Jeff Clearwater]

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Hi Allan & Ray,

Thanks! That's what I needed.  That's why I love this list.

Best,

Jeff C.

>
>Here is John Wiles' excellent response:
>
>>  Allan:
>>
>>  On flexible cords and cables:
>>
>>  Section 690.31(C) of the NEC allows, but does not require, the use of
>>  Article 400 flexible power cords on trackers.  Although they are
>>  available with the appropriate ratings, here in the sunny Southwest,
>>  we find that the insulation gets stiff after a few years in the sun.
>>  The modest rotational rate of trackers (900 revolutions per decade)
>>  usually means that exposed USE-2 single conductors cables with some
>>  room to move work fine on trackers as do RHW-2 conductors in flexible
>>  nonmetallic conduit.
>>
>>  The NEC identifies the hard-usage flexible cords in Table 400.4.  The
>>  UL Marking Guide for Wire and Cable (October 2003)
>>
>(http://underlab2-1.cva-colo.bbnplanet.com:8765/query.html?col=ulcom&qt=mark
>ing+Guide)
>>  indicates that flexible cables that have been evaluated for outdoor
>>  use will have a "W" in the type designation such as "SJTW" and may
>>  also be marked "Outdoor".  These cables are suitable for direct
>>  exposure to outdoor conditions (wet and sunlight").
>>
>>  The Marking Guide contains much other useful information including
>>  the fact that RHW and RHW-2 cables may be evaluated for exposure to
>>  sunlight and marked "Sunlight Resistant".   The UL web site
>>  (www.ul.com) also maintains the current listing status of all
>>  products, if you can wade through the voluminous material on the site.
>>  >----- Original Message -----
>>  >From: "Jeff Clearwater" <clrwater at earthlink.net>
>>  >
>>  >690.31 (C) states that all flexible cords for solar trackers must
>>  >meet Article 400 and table 400.4 and be rated for extra-hard use,
>>  >weather and water resistant AND be sunlight resistant.
>>  >
>>  >But in referring to Table 400.4 I see no reference to Sunlight
>>  >Resistance nor do I see it in referring to the standard letter
>>  >designations in Table 310.13 - except that UF cord is listed as
>>  >sunlight resistant in Article 340 and USE in Article 338.
>>  >
>>  >(And where in the code is RHW-2 (multicontact cord) listed as
>>  >sunlight resistant?)
>>  >
>>  >BUT MY MAIN QUESTION IS :Does anyone know which SO cord type is
>>  >listed as sunlight resistant and/or where in the Code specific
>>  >reference is made to suitable sunlight resistant flexible cord that
>>  >will meet 690.31 (C)?
>>  >
>>  >Is Sunlight Resistance covered in any standard letter designations or
>>  >is just an add on rating printed on the Cord.  If that's the case
>>  >where does one find Sunlight Rated SO Cord?
>
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-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Jeff Clearwater
Village Power Design Associates
http://www.villagepower.com
jeffc at villagepower.com
Sustainable Energy & Water Solutions for Home & Village

NABCEP Certified PV Installer

Office:  (413) 256-6777,  Cell: (720)480-8455 
Fax:  (413) 825-0372
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(877) 765-2784

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Founder:  Ecovillage Research, Development, and Demonstration Program:
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