Carflex revisited [RE-wrenches]

[Bill Brooks]

Pat and other flexible wrenches,

Thanks for the info. I believe if you look at the Heyco-Flex II it should
have a backwards "UR" which stands for UL-recognized. This means that
Solarex can install it in a UL-list package, but many inspectors may not
allow it in a field installed situation. That is the same issue with the
Corrflex that I presented in my email.

Ambient temperature for wiring or conduit is the highest temperature it will
see in the application. On the back of a module connected to a junction box
on  a roof-mounted (stand-off) installation, the conduit will get about 30
degrees  C hotter than the outdoor temperature. If you have days that get to
40 degrees C (just over 100F) you will see 70C temperatures on your flex.
This is not referring to back of module temperature which is typically 5C
hotter.

You can see that 60C is clearly not hot enough. I spoke with a rep today
that was in touch with the engineers at Electriflex (makers of Liquatight)
and he said that they make an "All-Temperature Liquatight" ATLA that is 105C
dry rated but the UL does not have a listing category any more for 80C.
Sounds like we need to connect with UL and get them on board with this
issue. Let's hear back from Bob-O now.

Bill.


> -----Original Message-----
> From: Pat Kiernan, Eco Electric, Inc. [mailto:ecoelec at rof.net]
> Sent: Thursday, May 24, 2001 7:14 PM
> To: RE-wrenches at topica.com
> Subject: RE: Carflex revisited [RE-wrenches]
>
>
> Wrenches,
>
> From my posting of 4/23/01...
> I have used Carlon Carflex for years with no problems. In the Colorado
> mountains we do not see the hot days that would drive back of module to 75
> C. Recently tried Heyco Heyco-Flex II on a few projects. It has a
> temperature rating of 70 C (no wet/dry distinction in the catalog). It is
> more flexible than the Carflex so hopefully will reduce strain on
> the j-box.
> Standard color is black. Somewhat more expensive than Carflex.
>
> I neglected to mention in April that the Solarex MSX-120 comes from the
> factory with Heyco-Flex II connecting the two module j-boxes (one for each
> 60 watt section). Since the MSX-120 is UL approved, I assume that
> this flex
> is suitable for module wiring.
>
> I would like to  see some clarification between  module back surface
> temperature and the flex conduit ambient temperature in this application.
> Bill Brooks, others ... any info?
>
>
>
> Pat Kiernan
>
> Eco Electric, Inc.
> PO Box 550
> Carbondale, CO 81623
> tel/fax (970) 963-3132
> e-mail: ecoelec at rof.net
>
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