[RE-wrenches] solar hot water penetration flashing

[troy Harvey]

Any thoughts on how to flash a copper pipe roof penetration on a metal  
roof. The brazed copper flashing we typically use would cause  
corrosion with the steel roof I'm afraid. WHat have others used in  
this situation?

Troy Harvey
---------------------
Heliocentric
801-453-9434
taharvey at heliocentric.org


On Dec 10, 2008, at 11:07 AM, R. Walters wrote:

> I have a volt drop spreadsheet on our website as well at http://www.solarray.com/TechGuides/TGmain_T.php
> It uses NEC temp correction for resistance, and another temp  
> correction for ampacity. One is based on ambient air temp, and one  
> is wire temp. All calculations are taken directly from the 2005  
> NEC( don't think wire changed in 2008) Also, it lets you look at  
> various wires at the same time like William's. I don't currently  
> have AC on it, but it's getting cold here, so maybe I'll add that  
> this winter.
> I hid the ampacity stuff I attempted, since NEC has so many factors  
> to consider, but its still on there, if you unhide all the rows.  I  
> also tried to do a sizing based on wire cost thing, but when wire  
> pricing shot up, it threw all that off too.
> You can still use that, you just have to enter your per ft cost for  
> each wire size. The idea was to not spend $1000 putting in 4/0 cable  
> to save $100 worth of solar power.
>
>
> Ray
>
> On Dec 10, 2008, at 8:16 AM, Wind-sun.com wrote:
>
>> The NEC values are for 75C, but not everything operates at that  
>> temperature (167F), nor or all uses of wire under NEC codes. I  
>> understand why the spreadsheet is set up for NEC since that covers  
>> probably 98% of all uses.
>>
>> At room temperature (25C), the resistance values are almost 20%  
>> less - the "standard" physics value of #10 AWG is almost exactly 1  
>> ohm per 1000 feet at 26C.
>>
>> http://en.wikipedia.org/wiki/American_wire_gauge
>>
>> ..................................................................................................
>> Northern Arizona Wind & Sun - Electricity From The Sun
>> ..................................................................................................
>>
>> ----- Original Message ----- From: "William Miller" <wrmiller at charter.net 
>> >
>> To: "RE-wrenches" <re-wrenches at lists.re-wrenches.org>
>> Sent: Tuesday, December 09, 2008 11:48 PM
>> Subject: Re: [RE-wrenches] voltage drop
>>
>>
>>> Dear Wind & Sun:
>>>
>>> What "standard" are you referring to?  We are using the 75C values  
>>> from the NEC in order to assure code compliance.  We need to have  
>>> a direct link to the NEC in case of compliance or liability issues.
>>>
>>> Thanks for asking.
>>>
>>> William Miller
>>>
>> _______________________________________________
>> List sponsored by Home Power magazine
>>
>> List Address: RE-wrenches at lists.re-wrenches.org
>>
>> Options & settings:
>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>>
>> List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
>>
>> List rules & etiquette:
>> www.re-wrenches.org/etiquette.htm
>>
>> Check out participant bios:
>> www.members.re-wrenches.org
>>
>
> R. Walters
> Solarray.com
> NABCEP # 04170442	
>
>
>
> _______________________________________________
> List sponsored by Home Power magazine
>
> List Address: RE-wrenches at lists.re-wrenches.org
>
> Options & settings:
> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>
> List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
>
> List rules & etiquette:
> www.re-wrenches.org/etiquette.htm
>
> Check out participant bios:
> www.members.re-wrenches.org
>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20081210/1da8d713/attachment-0003.html>