Ex m
Encapsulation
Relays, signal &
control units
Apparatus is totally encapsulated by a non-porous compound & electrical connection is by flying leads
Ex n Non - Incendive* Gives a level of protection by housing electrical equipment in substantial enclosures that inhibit mechanical damage & give some degree of ingress protection
Ex o Oil Immersion Switchgear Transformers Equipment is totally immersed in oil preventing an explosive atmosphere from reaching the equipment