![]() The intent is that neither flush nor extended head operators be used for e-stop functions. There’s no hard answer to this, but I can say this: there are three fundamental shapes for push button operators, flush, extended, and mushroom. “Mushroom Shape” is specifically called out in some standards, but the newer style e-stop switches are becoming less and less Mushroom Shaped. ![]() 301 and the type C standards for particular types of machinery have their emergency stop requirements derived from these standards. The other National Standards, like NFPA 79, or CSA C22.2 No. International Electrotechnical Commission (IEC). Low voltage switchgear and controlgear - Part 5-5: Control circuit devices and switching elements - Electrical emergency stop device with mechanical latching function, IEC 6/A1/A2/A11. ![]() Safety of machinery - Electrical equipment of machines - Part 1: General requirements, IEC 60204-1. ![]() International Organization for Standardization (ISO). Safety of machinery - Emergency stop - Principles for design, ISO 13850. There are three primary sources for the requirements for emergency stop devices: These ones came to me through the IEEE PSES EMC-PSTC Product Compliance Forum mailing list. Here are some more questions I’ve been asked regarding emergency stop requirements.
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