Q: What is a legend?
A: A legend is any type of marking, sign, or inscription which identifies the device type, function or purpose. Banner offers industrial-strength yellow stickers to be used as legends with E-stops.
Q: Why do I need a legend on my E-stop?
A: If your E-stops are red mushroom-shaped buttons on a yellow background, you won't need a legend. But if your E-stops are only red, you will need to add a legend. It's a "Good Engineering Practice" for any type of actuator on a machine to be easily identifiable. In a hazardous situation, it's especially critical to be able to quickly and easily identify an E-stop actuator!
Q: Tell me more about Good Engineering Practices.
A: Good Engineering Practices are minimum compliance guidelines that specify commonly used and recognized safety components to make the workplace free of hazards. These guidelines are constantly evolving as more safequarding solutions become available and widely accepted. Here's a Good Engineering Practices Bulletin on Improving E-stop Actuator Safety.
Q: Is it against regulation not to have a legend on my E-stop?
A: E-stop push buttons should have a red mushroom head with a yellow background. This color combination is reserved exclusively for E-stops and is a national and international requirement for all industrial machine tools. Now, I doubt an inspector will come in to your plant and tell you to upgrade. But this is an economically feasible safety feature with which employers can easily comply.
Q: Do I need one of these legends on rope pulls or cable pulls?
A: It is required on all E-stop pushbutton actuators and other types, where feasible. You can imagine trying to implement a yellow background on an emergency-stop Pull-Cord! It wouldn't be expected or required in this case, though the cord would still need to be easily identifiable.
Q: How will adding legends to E-stops improve safety at my plant?
A: The legends will enhance E-stop recognition, first and foremost. You don't want employees searching for an E-stop in a hazardous situation. Secondly, the legends will help call attention to and highlight overall plant safety. The rest depends on how management fosters employee participation in a safety program. The greater the participation, the greater the benefit.
Q: Which regulation states that my E-stops require a legend?
A: How many do you want?! Let's start with two almost identical standards which are considered "horizontal" and apply to virtually every machine in the industrialized world. ANSI/NFPA 79 electrical requirements for Machine Tools (USA) and IEC 60204-1 Electrical Requirements for Machine (Most of the rest of the world).
Q: Do all E-stops require legends?
A: If you see a red E-stop actuator button without a yellow background, then yes, the button requires a yellow legend to bring it into compliance.