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 <[email protected]>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" <[email protected]> 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 <[email protected]> > 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:* [email protected] [mailto: > >> [email protected]] *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 > >> > >> _______________________________________________ > >> List sponsored by Home Power magazine > >> > >> List Address: [email protected] > >> > >> Options & settings: > >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > >> > >> List-Archive: > >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > >> > >> List rules & etiquette: > >> www.re-wrenches.org/etiquette.htm > >> > >> Check out participant bios: > >> www.members.re-wrenches.org > >> > >> > >> > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: [email protected] > > Options & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > > >
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