Dynamic elaboration on the Art & Science of Hazardous Area Protection
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