Equipment Protection Level : Made Easy

Equipment Protection Level : Made Easy

In electrical engineering,  SWITCH is a  SIMPLE COMPONENT that can MAKE or BREAK an electrical circuit . (Wikipedia)

The ASCENT OF THIS simple device can give us an insight into the development of Electrical Standards in general & Hazardous Area Standards in particular.

Let us follow

The ASCENT OF A SWITCH (My personal view )

The weakest link in Ex-Chain .

The overall protection level will depend on the lowest protection level existing in the combined protection 

in other words :

Ex -CHAIN is as STRONG as its WEAKEST LINK