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The Atex Directive simplifies
knowing what equipment can be used in different zones by grouping and
categorizing them according to the following table (e.g. in a Zone 0 vessel,
equipment must be Group 11, Category 1). This removes the necessity for users to
memorise if particular types of protection are appropriate to particular zones. |
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For Equipment Used in: |
Designation |
Product Location & Protection Requirements |
Category |
|
Mining |
Group I |
Products that
remain functional in explosive atmospheres and have protection measures
such that if:
· one measure fails, another provides sufficient safety
· two independent faults occur, sufficient safety is provided |
M1 |
|
Products intended to be de-energised in event of explosive
atmospheres. Products must provide safety in event that
explosive atmospheres could occur before being de-energised
and under severe operating conditions. |
M2 |
|
All Other Explosive Atmospheres |
Group II |
Where
explosive atmospheres (gases vapours, mist or dust)
are
highly likely to
occur and present continuously for long
periods or frequently (similar to
Zone 0
in IEC 79-10 and
Zone 20 for dust),
protection must:
* In the event of 1 measure failing, have at least a second
independent measure to provide sufficient safety.
* In the event of 2 independent faults, ensure sufficient safety |
1 |
|
Where explosive atmospheres (gases vapours, mist or dust)
are likely to occur (similar to
Zone 1
in IEC 79-10 and
Zone 21 for dust),
protection measures must provide safety
even with operating faults or in dangerous operating
conditions |
2 |
|
Where explosive atmospheres (gases,
vapours, mist or dust)
are less likely to occur and if they do, are infrequent and for
a short time (similar to
Zone 2
in IEC 79-10), protection
measures must be at a level for the intended use and equipment
operate within its operational parameters. |
3 |
