Intrinsically safe (is) apparatus


#1

Intrinsically safe electrical apparatus are divided into 3 categories
“ia” , “ib” and “ic”

Safety Level –ia-
If a single fault or any combination of 2 faults occurs during normal operation, the electrical apparatus of this category must NOT be capable of causing an ignition

Safety Level –ib-
This category must NOT be capable of causing an ignition during normal operation and with occurrence of a single fault
Safety Level –ic-
Limit the energy and spark during normal operation but suitable for zone 2 usage only