Except it isn't as simple as that - you will be depending on the reverse
light switch *closing* to act as the fail-safe for the OD failing to *open*,
and need a relay in addition to the two switches, which probably has a
higher failure rate than these switches. I have never heard of one of these
switches failing in the closed position, but failing to close is quite well
known. Given that, there is little point in adding complication.
PaulH.
----- Original Message -----
> If you have 2 switches connected in series it halves the possibility in
"real
> failing", while it doubles in failing in the open state, which I think
> everybody could live with.
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