[RE-wrenches] Incompatible Metals

jay peltz jay at asis.com
Fri Jan 14 11:37:35 PST 2011


HI Peter,

I"m wondering that since the insulation isn't needed at all, wouldn't that negate the need for -2?

thanks,

jay

peltz power

On Jan 14, 2011, at 11:04 AM, Peter Parrish wrote:

> Great idea Kelly! I didn't know one could get green jacketed USE or XHHW. Do
> you have a source? Also, do you think that we might need wire rated "-2" for
> 90 deg C wet locations. I know that this is not a current carrying
> conductor, but roof tops are definitely 90 deg C wet environments. Your
> thoughts?
> 
> - Peter
> 
> 
> Peter T. Parrish, Ph.D., President
> California Solar Engineering, Inc.
> 820 Cynthia Ave., Los Angeles, CA 90065
> CA Lic. 854779, NABCEP Cert. 031806-26
> peter.parrish at calsolareng.com  
> Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885
> 
> 
> -----Original Message-----
> From: re-wrenches-bounces at lists.re-wrenches.org
> [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Kelly
> Keilwitz, Whidbey Sun & Wind
> Sent: Friday, January 14, 2011 10:14 AM
> To: RE-wrenches
> Subject: Re: [RE-wrenches] Incompatible Metals
> 
> Peter,
> I have never understood the common practice of using bare copper  
> ground wire on and against aluminum frames and modules. It always has  
> been a dissimilar metals issue. Just look anywhere copper has set  
> against aluminum for awhile.
> We use #10 green jacketed Cu USE or XHHW conductor and strip away the  
> jacket at each lug, using No-Ox on that section of bare wire at the  
> lug. The wire can be tucked in to the module frames and with the PV  
> conductors.
> 
> Kelly Keilwitz, P.E.
> Whidbey Sun & Wind
> Renewable Energy Systems
> kelly at whidbeysunwind.com
> 360-678-7131
> 




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