TC cable [RE-wrenches]

[graham at solarexpert.com]

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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