[RE-wrenches] NEC 690.74

[Philip Boutelle]

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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