Indicator lights

[Aaron Casebeer]

I heard about a possible new code. The color of indicator lights.
Example: on/off. The usual for me would be to have green be on and red be off. (Motor running/motor not running) I was told that red is now to be on and green is to be off. Has anyone heard of this?
This would be in a industrial setting. I work on an oil/gas platform in Alaska.

 

[Jim W in Tampa]

Seems wrong being we use red to stop green to go on all our roads.
And blue to go faster

 

[mdshunk]

Red = on, green = off has been the standard for MCC's everywhere I've been. I'd suspect it's an ANSI standard. Certainly nothing the NEC would ever get involved in.

 

[mdshunk]

Found some stuff in NFPA 79 on lights, that I'll paraphrase:
Green=safe
Red=danger
white=power available
yellow=overloads tripped.

 

[zog]

It is a standard and has been for years, I had to look it up 10 yeasrs ago to settle a bet, ANSI or IEEE, cant remmember which.

Red - Closed/On/Energized (Danger)
Green - Open/Off/De-energized (Safe)

 

[jim dungar]

One thing I remember, to change the state of the machine, push the color of the button that matches the light which is on.

Red light on, push red button to stop the machine.
Green light on, push green button to start the machine.

But back in the early eighties, between Allen-Bradley, Cutler Hammer, and Square D motor control products; two of them used one color for ON (red I think) and one had the other color.

 

[tom baker]

Millions of traffic signals use green for go and red for stop.
There is an ANSI or similar standard that uses RED for energized.

 

[Ragin Cajun]

Depends on the industry. Some use red for motor running, others green. Yep, confusing to us, but not to someone at the facility.

"Deny Everything"