PTC Motor Protection Double "Isolation"?
In the ACS880, ACS580, ACQ580 manuals, there is this same recommendation for PTC wiring when hooked to DI6:
"If DI6 is used as a PTC input, the wiring and the PTC sensor need to be double isolated. Otherwise the CMOD-02 I/O extension module must be used."
What is meant by double "isolation"? Do they mean double "insulation"?
Also, if double insulation is meant, I still do not fully understand what the requirement is here and why single insulation cannot be used.
I need a full explanation please.
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