Tom,
I remember the standard to which you are referring. About 30 years ago, there were NEMA and JIC standards that required RED lights for Motor Running (danger) and Green for Motor Off (safe). Now those have been deleted, best I can find out. I suppose NEMA got tired of fighting the Bubbas that thought it should be the same as traffic lights (with them in the drivers seat, not as pedestrians where of course it is opposite)!
There are still a bunch of old Motor Control Centers out there that have those big RED pilot lights that go on every time a motor starts!
Interesting thought: Could it be that at one time everyone in the US thought like pedestrians, because most people did more walking than driving? Now I suppose we all think like drivers, even in New York City.
I remember the standard to which you are referring. About 30 years ago, there were NEMA and JIC standards that required RED lights for Motor Running (danger) and Green for Motor Off (safe). Now those have been deleted, best I can find out. I suppose NEMA got tired of fighting the Bubbas that thought it should be the same as traffic lights (with them in the drivers seat, not as pedestrians where of course it is opposite)!
There are still a bunch of old Motor Control Centers out there that have those big RED pilot lights that go on every time a motor starts!
Interesting thought: Could it be that at one time everyone in the US thought like pedestrians, because most people did more walking than driving? Now I suppose we all think like drivers, even in New York City.
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