Various defined protection methods can be utilised to mitigate the risks associated with the hazards of a hazardous area. These protection methods are engineered solutions to either remove one of the parameters required for an explosion or in the case of Ex d flameproof contain any explosion to prevent it propagating outside the protection containment.
All electrical equipment in the hazardous area must comply with EN 60079-0 the general standard, except were it is overridden by one of the other standards specific to the protection method.
The primary electrical protection methods are:
|Standard||Notes & Principles|
|Ex d||Flameproof||EN 60079-1||Contain the Explosion|
|Ex e||Increased Safety||EN 60079-7||High Integrity Non Sparking|
|Ex i||Intrinsic Safety||EN 60079-11||Power limitation|
|Ex t||Enclosure||EN 60079-31||Keep out the dust (Not for Gas)|
|Ex n||Various1||EN 60079-6||non sparking|
|Ex p||Pressurised||EN 60079-2||see EN 61241-4 for Dust|
|Ex m||encapsulated2||EN 60079-18||rarely used on its own|
|Ex o||Oil Filled||EN 60079-6||Rarely used|
|Ex q||Powder filled||EN 60079-05||Rarely used|
|Ex s||special||EN 60079-33||Used when no other method applies|
if an item is entirely encapsulated it has not connections i.e. aportable device. Ex m is either used as a component with trailing cables or more commonly in confunction with another protection method such as Ex em. ↩