"len gardener" wrote in message
...
i worked with this sort of eqipment and in all cases as far as i could
determine it came down to human error, there is a process to follow to
prevent from coming back over the power lead. but don't know how you
are going to fool proof whatever it is you are trying to fool proof,
humans will be humans.



A common mistake people make when trying to design something completely
foolproof is to underestimate the ingenuity of complete fools.
- Douglas Adams -


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Regards,
Alan.

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