[RE-wrenches] NEC 690.74

[Philip Boutelle]

The full wording from the installed battery cable:

"4/0 AWG (107.2MM2) TYPE RHH OR RHW-2 2KY (-40C) PR II SUN RES FOR CT USE
FT4/IEEE 1202 (UL) E18321 ---A.I.W.-D. --- CSA  LL8825 RW90 EP 1 KY (-40C)
EP/CPE TC FT4 --- EPR/CPE 2KY DIESLE LOCOMOTIVE CABLE P-07-KA090026-MSHA"

-Phil



On Mon, Nov 29, 2010 at 10:40 PM, Philip Boutelle <philboutelle at gmail.com>wrote:

> Phil-
> Thanks for the clarification; the dual listing makes sense, and I should
> have been more clear with my original wording to cover such dual ratings.
> I'll be back on-site on Wednesday, at which point I'll notate exactly what
> is on the wire.. but from the photos I have: "...OR RHW-2 2KV (-40C) PR II
> SUN RES FOR CT USE FT4/IEEE 1202..." then elsewhere "....2KV DIESEL
> LOCOMOTIVE CABLE P-..." sorry about the cutoffs, it's all I can read in the
> photos. We got this cable from Independent Electric Supply, an electrical
> distributor with locations around California.
> -Phil
>
>
> On Mon, Nov 29, 2010 at 10:07 PM, Phil Undercuffler <solarphil at gmail.com>wrote:
>
>> My recollection is that MTW is Machine Tool Wire, which indeed is not
>> recognized by the NEC.  It's an "other" category of wire intended to be used
>> by manufacturers as internal wiring on products which they then get listed.
>> So a wire with other ratings (such as USE, RHW, THHN) can also have a MTW
>> rating and be fine, but a wire with only an MTW rating should not be used as
>> field wiring by an installer.
>>
>> Also, do you have a source for RHW-2 battery cables?  Or did you mean to
>> say RHW, such as the typical Cobra X-Flex?
>>
>> Phil Undercuffler
>> On Nov 29, 2010 7:41 PM, "Philip Boutelle" <philboutelle at gmail.com>
>> wrote:
>> > Found the thread, very helpful.... thanks Glenn.
>> > The current parallel discussion on Battery Cables REvisited is helpful
>> too.
>> > The inspector (She, btw) is extremely thorough. Although she has asked
>> for
>> > proof of purpose-specific listings on just about everything, it seems I
>> > misquoted her in my previous post; I looked up her earlier plan review
>> > comments, and here's her original quote (from when my plans said to use
>> MTW
>> > for the battery cable): "MTW is not NEC approved for use". I think that
>> to
>> > her, if it isn't explicitly in the NEC then I can't use it (lists go
>> from
>> > being partial & inclusive to complete & limiting).
>> > -Phil
>> >
>> > On Mon, Nov 29, 2010 at 6:03 PM, Glenn Burt <glenn.burt at glbcc.com>
>> wrote:
>> >
>> >> Hi Phil,
>> >>
>> >>
>> >>
>> >> I posted some information that is relevant back in March of 2009. It
>> should
>> >> be in the searchable archives…
>> >>
>> >>
>> >>
>> >> -Glenn Burt
>> >>
>> >>
>> >>
>> >> *From:* re-wrenches-bounces at lists.re-wrenches.org [mailto:
>> >> re-wrenches-bounces at lists.re-wrenches.org] *On Behalf Of *Philip
>> Boutelle
>> >> *Sent:* Monday, November 29, 2010 8:08 PM
>> >> *To:* RE-wrenches
>> >> *Subject:* [RE-wrenches] NEC 690.74
>> >>
>> >>
>> >>
>> >> Wrenches,
>> >>
>> >>
>> >>
>> >> We have a string of batteries being inspected by a local AHJ. In
>> plan-check
>> >> comments, I was asked to ensure that the flexible cable was UL-listed,
>> so we
>> >> made sure of this when it came from the suppliers. We used 4/0 RHW-2.
>> Now
>> >> our inspector is asking if "RHW-2 is fine-stranded in Article 400 of
>> the NEC
>> >> as required by 690.74?"
>> >>
>> >>
>> >>
>> >> Article 400 doesn't explicitly define any cable types for use in
>> battery
>> >> systems, and the one general disclaimer is in 400.4: "Types of flexible
>> >> cords and flexible cables other than those listed in the table shall be
>> the
>> >> subject of special investigation".
>> >>
>> >>
>> >>
>> >> Has anyone had a similar request before? Anyone done a "special
>> >> investigation" on cables, and have results to share? Any other
>> thoughts?
>> >>
>> >>
>> >>
>> >> Thanks for any help,
>> >>
>> >>
>> >>
>> >> -Phil
>> >>
>> >> Real Goods Solar
>> >>
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