Quote Originally Posted by SatanicIntention View Post
With a back-up, you would have both probes stuck to the flexwatt. If one came loose, such as the primary, then the backup would register that the flexwatt has gotten too hot and would shut off.
Yeah, but it would have only shut off the backup unit if they were wired in parallel (leaving the primary unit to over-heat the tape). If they are wired in series, then the failure of either unit (ie. one dies and goes dark), would cause the rack not to heat at all.