What exactly is PELV?

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

What exactly is Protected Extra-Low Voltage (PELV)? Electrical designers run into lots of specialized terminology as part of their work. IEC is notorious for creating specialized terms unfamiliar 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 run…

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Emergency Stop Categories

Emergency Stop on machine console

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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