TC cable [RE-wrenches]

Fri Nov 9 17:12:09 PST 2001

Graham,

Unfortunately, the UL identification you show is a recognition, not a
listing. This is a subtile but very important distinction with UL. A fully
UL-listed product (wire, conduit or whatever) can be field installed
according to the manufacturers directions. A UL-recognized part simply means
that it has been through some form of UL evaluation that does not need to be
repeated when a company wants to list their own product and include in that
listing other parts (like a flexible conduit).

Since Siemens asks the installer to select the proper equipment and
recommends that flexible be used, there is no way to fulfill both requests
with existing equipment.

This is not to say that the Heyco product is not perfectly suitable for this
application. The Siemens product was not listed with this product as part of
its listing. I would continue to use it unless an inspector says otherwise.
Siemens needs to get their act together on this issue and help the installer
out.

Thanks for the info and keep up the good work.

Bill.

> -----Original Message-----
> From: graham at solarexpert.com [mailto:graham at solarexpert.com]
> Sent: Friday, November 09, 2001 4:09 PM
> To: RE-wrenches at topica.com
> Subject: RE: TC cable [RE-wrenches]
>
>
> Bill,
>
> From my reading of the Heyco printed catalog the "Heyco-Flex I" liquid
> tight conduit is UL Type B Flexible.  UL File #E-1211096.
>
> "Heyco-Flex II" is recognized under the Component Program of
> Underwriters' Laboratories File #E-1211095.  Temperature rating 70C
> (160F) and passes a submersion test of 70 PSI.
>
> I have been using the Heyco Flex II.  If there is a better product I
> will switch immediately.  I like to feel that my installs are of the
> highest quality and safety possible.
> The reason I like the Heyco-Flex II is because it is east to cut, the
> Heyco brand connectors are easy to install, it is very flexible, smooth
> inside for wire pulling, and resists corrosion, oil and water.
>
> The Heyco catalog contains many product useful for solar applications.
>
> Heyco Products, Inc 1-800-526-4182 located in Toms River, NJ.
>
> On a different subject, I was contacted today by Deltec Company, located
> here in L.A., they manufacture shunts and fusing and have been supplying
> Xantrex.  They will sell direct and their website is www.deltecco.com
> (562)-926-2304 ask for Tino.
>
> Thanks Bill
>
> Graham Owen
>
>
>
> Bill Brooks wrote:
> > Graham,
> >
> > It is certainly not sub-standard. I'm not familiar with the flexible
> > conduit
> > from Heyco. Is it UL-listed? If you could share that information, others
> > might benefit as well.
> >
> > 70C is right on the borderline of temperature. It is probably fine for
> > the
> > LA basin, but may not be okay if you are working in Palm Springs. That
> > is
> > why having a conduit that goes up to 80C takes care of most temperature
> > issues (unless someone were to violate the manufacturers information and
> > bolt the module directly to the roof).
> >
> > Bill.
> >
> > > -----Original Message-----
> > > From: graham at solarexpert.com [mailto:graham at solarexpert.com]
> > > Sent: Friday, November 09, 2001 1:44 PM
> > > To: RE-wrenches at topica.com
> > > Subject: RE: TC cable [RE-wrenches]
> > >
> > >
> > > Bill,
> > >
> > > I have been using flexible conduit manufactured by Heyco
> (www.heyco.com)
> > > for module interconnections with the Siemens systems.  This conduit is
> > > rated at 70C wet location, is this ok?  This is the same
> conduit used by
> > > the entertainment industry for exterior applications.  I am
> using 10 ga
> > > THWN-2 within the conduit and all exposed runs are emt.  I
> hope this is
> > > not sub-standard?
> > >
> > > Yours truly,
> > >
> > > Graham Owen
> > > GO Solar Company
> > >
> > >
> > >
> > >
> > > Bill Brooks wrote:
> > > > Lee,
> > > >
> > > > Nothing is inspector proof. Tray Cable (TC) is available in a format
> > > > that
> > > > meets all the requirements of the code. The sheeth is rated
> for 90C wet
> > > > locations, and the conductors can be specified as THWN-2 (90C Wet
> > > > conductors). As Bob-O is keen to point out, there is no
> flexible conduit
> > > > currently on the market that is rated for greater than 60C
> wet. This is
> > > > because UL has dropped its 80C Wet testing for conduit apparently
> > > > because no
> > > > one was asking to have it tested that way.
> > > >
> > > > Siemens recommends the use of flexible conduit in their Earthsafe
> > > > system, so
> > > > it sounds like they are the ones to step forward and work
> with a conduit
> > > > manufacturer and UL to get us higher rated conduit.
> > > >
> > > > As I see it, the only truly code-compliant means of interconnecting
> > > > modules
> > > > is USE-2 cable and Tray Cable with THWN-2 conductors. There may be
> > > > something
> > > > else, but none more practical.
> > > >
> > > > Bill.
> > > >
> > > >
> > > >
> > > > -----Original Message-----
> > > > From: Lee Tavenner, Solar Plexus [mailto:solplex at montana.com]
> > > > Sent: Wednesday, November 07, 2001 3:43 PM
> > > > To: RE-wrenches at topica.com
> > > > Subject: TC cable [RE-wrenches]
> > > >
> > > >
> > > > TC cable for grid tie panels on roof interconnects and panels to
> > > > combiner box.  Is this code compliant, inspector proof,
> practical? Or is
> > > > it definitly a no,no? Reference?
> > > >
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