TC cable [RE-wrenches]

[Bill Brooks]

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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