The full wording from the installed battery cable:<div><p class="MsoNormal"><span style="color:#1F497D">"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"</span></p><p class="MsoNormal"><span style="color:#1F497D">-Phil</span></p><p class="MsoNormal"><span style="color:#1F497D"><br></span></p><br><div class="gmail_quote">
On Mon, Nov 29, 2010 at 10:40 PM, Philip Boutelle <span dir="ltr"><<a href="mailto:philboutelle@gmail.com">philboutelle@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div>Phil-</div><div>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.</div>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. <div>
-Phil</div><div><div></div><div class="h5"><div><br><br><div class="gmail_quote">On Mon, Nov 29, 2010 at 10:07 PM, Phil Undercuffler <span dir="ltr"><<a href="mailto:solarphil@gmail.com" target="_blank">solarphil@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<p>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. </p>
<p>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? </p>
<p>Phil Undercuffler</p><div><div></div><div>
<div class="gmail_quote">On Nov 29, 2010 7:41 PM, "Philip Boutelle" <<a href="mailto:philboutelle@gmail.com" target="_blank">philboutelle@gmail.com</a>> wrote:<br type="attribution">> Found the thread, very helpful.... thanks Glenn.<br>
> The current parallel discussion on Battery Cables REvisited is helpful too.<br>> The inspector (She, btw) is extremely thorough. Although she has asked for<br>> proof of purpose-specific listings on just about everything, it seems I<br>
> misquoted her in my previous post; I looked up her earlier plan review<br>> comments, and here's her original quote (from when my plans said to use MTW<br>> for the battery cable): "MTW is not NEC approved for use". I think that to<br>
> her, if it isn't explicitly in the NEC then I can't use it (lists go from<br>> being partial & inclusive to complete & limiting).<br>> -Phil<br>> <br>> On Mon, Nov 29, 2010 at 6:03 PM, Glenn Burt <<a href="mailto:glenn.burt@glbcc.com" target="_blank">glenn.burt@glbcc.com</a>> wrote:<br>
> <br>>> Hi Phil,<br>>><br>>><br>>><br>>> I posted some information that is relevant back in March of 2009. It should<br>>> be in the searchable archives<br>>><br>>><br>
>><br>>> -Glenn Burt<br>>><br>>><br>>><br>>> *From:* <a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">re-wrenches-bounces@lists.re-wrenches.org</a> [mailto:<br>
>> <a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">re-wrenches-bounces@lists.re-wrenches.org</a>] *On Behalf Of *Philip Boutelle<br>
>> *Sent:* Monday, November 29, 2010 8:08 PM<br>>> *To:* RE-wrenches<br>>> *Subject:* [RE-wrenches] NEC 690.74<br>>><br>>><br>>><br>>> Wrenches,<br>>><br>>><br>>><br>
>> We have a string of batteries being inspected by a local AHJ. In plan-check<br>>> comments, I was asked to ensure that the flexible cable was UL-listed, so we<br>>> made sure of this when it came from the suppliers. We used 4/0 RHW-2. Now<br>
>> our inspector is asking if "RHW-2 is fine-stranded in Article 400 of the NEC<br>>> as required by 690.74?"<br>>><br>>><br>>><br>>> Article 400 doesn't explicitly define any cable types for use in battery<br>
>> systems, and the one general disclaimer is in 400.4: "Types of flexible<br>>> cords and flexible cables other than those listed in the table shall be the<br>>> subject of special investigation".<br>
>><br>>><br>>><br>>> Has anyone had a similar request before? Anyone done a "special<br>>> investigation" on cables, and have results to share? Any other thoughts?<br>>><br>>><br>
>><br>>> Thanks for any help,<br>>><br>>><br>>><br>>> -Phil<br>>><br>>> Real Goods Solar<br>>><br>>> _______________________________________________<br>>> List sponsored by Home Power magazine<br>
>><br>>> List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org" target="_blank">RE-wrenches@lists.re-wrenches.org</a><br>>><br>>> Options & settings:<br>>> <a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org" target="_blank">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><br>
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