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MCC run, ready light
- Thread starter cmelguet
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LionelHutz
Electrical
Where are you?
Around here, red and green are used for stopped and running, some places use green for running and others use red for running. Amber is generally for faults.
Around here, red and green are used for stopped and running, some places use green for running and others use red for running. Amber is generally for faults.
You have fallen down the rabbit hole. The Cheshire Cat awaits you with a grin...
It is a never ending debate to which there is no definitive answer, including on the concept of whether or not there IS a definitive answer. The "Stoplight" convention (Green = Go, Red = Stop) is equally valid to some people, whereas the "Industrial Safety" convention (Red = On / Dangerous, Green = Off / Safe) is the only one worth considering to others yet is itself often considered "dangerous" by those who adopt the Stoplight convention (and vice versa).
One issue that I think causes some of the confusion is the aspect of color definitions for Push Buttons getting inappropriately (in my opinion![[wink]](/data/assets/smilies/wink.gif "[wink] [wink]")
mixed in with indicator light colors. In the Industrial Safety convention and most other standards I've seen, a Green PB = Start, a Red PB = Stop. So many people translate that over to the indicators, which then becomes the Stoplight convention.
In general, Amber / Yellow is most often used for a Fault indication, but then there are those who make up their own scheme: I am working on one right now that is White for Ready, Green for Running, Blue for Off and Red for Fault (I think it's nuts myself, but I'm not the design engineer).
There are probably more "standards" that support the Industrial Safety convention, but then there are standards that support the Stoplight convention or having no definitive answer as long as it is well defined and understood in a facility.
Probably not what you wanted to hear though...
"Dear future generations: Please accept our apologies. We were rolling drunk on petroleum."
— Kilgore Trout (via Kurt Vonnegut)
For the best use of Eng-Tips, please click here -> faq731-376
It is a never ending debate to which there is no definitive answer, including on the concept of whether or not there IS a definitive answer. The "Stoplight" convention (Green = Go, Red = Stop) is equally valid to some people, whereas the "Industrial Safety" convention (Red = On / Dangerous, Green = Off / Safe) is the only one worth considering to others yet is itself often considered "dangerous" by those who adopt the Stoplight convention (and vice versa).
One issue that I think causes some of the confusion is the aspect of color definitions for Push Buttons getting inappropriately (in my opinion
mixed in with indicator light colors. In the Industrial Safety convention and most other standards I've seen, a Green PB = Start, a Red PB = Stop. So many people translate that over to the indicators, which then becomes the Stoplight convention.In general, Amber / Yellow is most often used for a Fault indication, but then there are those who make up their own scheme: I am working on one right now that is White for Ready, Green for Running, Blue for Off and Red for Fault (I think it's nuts myself, but I'm not the design engineer).
There are probably more "standards" that support the Industrial Safety convention, but then there are standards that support the Stoplight convention or having no definitive answer as long as it is well defined and understood in a facility.
Probably not what you wanted to hear though...
"Dear future generations: Please accept our apologies. We were rolling drunk on petroleum."
— Kilgore Trout (via Kurt Vonnegut)
For the best use of Eng-Tips, please click here -> faq731-376
Hello Mate,
I think most people would agree an emergency stop is invariably red in colour.
Therefore, a 'normal' stop push button is normally red (in the UK at least).
When an engineer walks into a plantroom and sees all green lights he assumes all is ok and operating normally.
If he sees a red light, this will subconsciously attract his attention(as does a red stop traffic light or a red warning sign etc).
Hope this helps.
p.s. a red light in Amsterdam means something entirely different!
I think most people would agree an emergency stop is invariably red in colour.
Therefore, a 'normal' stop push button is normally red (in the UK at least).
When an engineer walks into a plantroom and sees all green lights he assumes all is ok and operating normally.
If he sees a red light, this will subconsciously attract his attention(as does a red stop traffic light or a red warning sign etc).
Hope this helps.
p.s. a red light in Amsterdam means something entirely different!
davidbeach
Electrical
Red lights mean all is well. It's green lights that signify trouble. Transforming a substation full of red lights into station full of green lights results in lots of 'splaining.
It's a deep rabbit hole, jraef.
I don't know of a standard, either.
Old Square-D and newer Schneider/Square-D low-voltage switchboards with integral control of a backup generator have:
White = ready
Yellow = trouble (can still operate transfer apparatus manually)
Red = breaker closed (source connected to bus)
Green = breaker open (source disconnected from bus)
Blue = fault (both breakers disconnected, fixing needed)
For manual operation of the breakers, though, black = close, red = open
Good on ya,
Goober Dave
Haven't see the forum policies? Do so now: Forum Policies
I don't know of a standard, either.
Old Square-D and newer Schneider/Square-D low-voltage switchboards with integral control of a backup generator have:
White = ready
Yellow = trouble (can still operate transfer apparatus manually)
Red = breaker closed (source connected to bus)
Green = breaker open (source disconnected from bus)
Blue = fault (both breakers disconnected, fixing needed)
For manual operation of the breakers, though, black = close, red = open
Good on ya,
Goober Dave
Haven't see the forum policies? Do so now: Forum Policies
Table 10.3.2 Machine Indicator Lights and Icons (paraphrased)
RED = Danger / Emergency / Faulty
YELLOW (AMBER) = Warning(Caution) / Abnormal
GREEN = Safe / Normal
BLUE = Mandatory action
CLEAR / WHITE = No specific meaning assigned
So I know how I interpret this, Red = Running, Green = Off. But the argument I always hear, is running "Danger" or is Running "Normal"? I understand that this may seem irrational to those that think like I do, yet those who believe the other way say that WE are equally irrational!
"Dear future generations: Please accept our apologies. We were rolling drunk on petroleum."
— Kilgore Trout (via Kurt Vonnegut)
For the best use of Eng-Tips, please click here -> faq731-376
RED = Danger / Emergency / Faulty
YELLOW (AMBER) = Warning(Caution) / Abnormal
GREEN = Safe / Normal
BLUE = Mandatory action
CLEAR / WHITE = No specific meaning assigned
So I know how I interpret this, Red = Running, Green = Off. But the argument I always hear, is running "Danger" or is Running "Normal"? I understand that this may seem irrational to those that think like I do, yet those who believe the other way say that WE are equally irrational!
"Dear future generations: Please accept our apologies. We were rolling drunk on petroleum."
— Kilgore Trout (via Kurt Vonnegut)
For the best use of Eng-Tips, please click here -> faq731-376
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