Hi Manning:
A long, long time ago, I discussed this with some UL
folks. I recall that the time this circuit was
developed as BEFORE grounding was implemented in the
USA. So, everything was 2-wire.
UL was testing lots of appliances, especially
refrigerators. The "n" switch was put in the circuit
so the tech would not need to open and close the
refrigerator door (to access the controls) while he
was making the measurment.
Best regards,
Rich
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