At 10:59 AM 1/8/2004 -0800, Harold Hallikainen wrote:
>Years ago, I was working on a telemetry system at a broadcast transmitter
>site. The equipment was in a rack beside the 5kW AM transmitter. The
>sample from the transmitter was ground referenced. I put a clip lead
>between the ground side of the sample and the rack cabinet the telemetry
>equipment was in. The clip lead melted....

I had a similar experience with shielded RS-485 in a grocery store.
Plugged the cable into a concentrator, and the cable started getting hot.
Turned out there was about 6V between the remote gnd and the local one.
Lots of current available though.

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