You might look into the line protection schemes used in industrial/phone lines
that are buried.  You can get lighting strikes via underground line.  A number
of manufactures sell devices that protect these lines from lighting strikes.
Go to the library and look up manufactures of lighting suppressor in the
Thomas Register.  You might look at companys that specialize in protectors for
RSXXX line are 4-20mA current loops.  I have seen devices that hang off of
each line and are connected to ground (they must be mounted outside and away
from device to be protected.

Dick Webb wrote:

> Well, my third board in 5 years has just bit the dust in an electrical
> storm and power outage.  I have Larry's amp board in a vault out back and
> run wires, barely below the surface to my PC in the house.  I also run a
> wire from the house to the vault for 110 volts. Both the incoming line and
> a line from the WWV antenna go to Larry's AtD board.  That is the board
> that blew.   The incoming line and the case I have the amp in are grounded
> or so it seems to me.  Is there any way to protect the overall system or
> should I consider board replacement an operating expense.
>
> Dick Webb
> Raleigh, NC
>
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--
Rex Klopfentein, Jr.
rklopfen@.........
http://www.wcnet.org/~rklopfen



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