IEC 60204-1 Archives - Machinery Safety 101

14 April, 2021

What exactly is PELV?

in Electrical Safety, Inherently Safe Design

Photo of the interior of an electrical control cabinet showing the components and wireways on the backplane.

What exactly is PELV? Electrical designers run into all kinds of specialized terminology as part of their work. IEC is notorious for creating specialized terms that are not familiar to North American designers. PELV is a definition of a limited range of system voltage and current and is related to some other terms you may…

27 September, 2010

Emergency Stop Categories

by Doug Nix

in Canada, CE Mark, Complementary Protective Measures, Control Functions, Emergency Stop, EU European Union, USA /

44 Comments

I’ve noticed a lot of people looking for information on Emergency Stop categories recently; this article is aimed at those readers who want to understand this topic in more depth. First, a clarification: Emergency stop categories DO NOT EXIST, but stop categories do. A stop category is a description of a control function – what…

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