On 5/30/2013 8:15 AM, RussellMc wrote:
> It did not say (AFAICS) on the page that you cited that it was neutral=20
> cure so I assume it wa sacetic cure - but maybe not. If so that is=20
> enough to cause equipment fatalities in some contexts - and none at=20
> all in others.
It is neutral cure. it think it says it on the package. I don't recall=20
it having the vinegar smell. The opening for the cabling is only a 1cm=20
hole so not much to seal.



> Above the water table is good :-). Some sealants would allow use with=20
> net hydrostatic external pressure and liquid present. Long term SR=20
> tends not to be one of these.

The problem we had with coming up with a solution for the farms wasn't=20
really water , but lack of water. The area is prone to wildfires every=20
so often and we didn't want to have to replace entire setups every time=20
brush fire flames or smoke made the equipment fail. We will still lose=20
the panels but all the hardware will be safe under ground and with 32 of=20
them every little bit of savings helps. We trialed a couple different=20
things before using the pipe and it turned out that simple was best. We=20
tried metal enclosures, ones that would work cost $300 , we tried=20
ceramic enclosures, too fragile.  One of the reasons for the install was=20
to alert of a possible fire situation, each setup  has a sensor the=20
farmers son , who is only 12, came up with. He used a short black=20
plastic tube with a 30awg wire inside making the connection, it just=20
lays in the brush 20 feet away and when the fire comes burns the wiring=20
and the plastic and triggers the alarm  . I was thinking about passive=20
sensors, thermistors and all this other stuff, and the kid comes up with=20
something so simple.

Mark


--=20
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