The Standards for electrical equipment will be used and applied
There are eight electrical protection concepts. The concepts are:
Protection Concept |
Zone of use |
Equipment Category |
|
Intrinsic safety |
ia |
0,1,2 |
1 |
ib |
1,2 |
2 |
|
ic |
2 |
3 |
|
Flameproof |
d |
1,2 |
2 |
Increased Safety |
e |
1,2 |
2 |
Purged & Pressurised |
p |
1,2 |
2 |
Powder Filled |
q |
1,2 |
2 |
Encapsulated |
m |
1,2 |
2 |
Oil Immersion |
o |
1,2 |
2 |
Non Sparking |
n |
2 |
3 |
Protective Measures
Protective measures shall be considered
Ensure ignition sources can not arise
Ensure ignition sources can not become effective
Prevent explosive atmosphere reaching ignition sources
Contains the explosion and prevents flame propagation
Constructional Requirements
Category 1 not more than 10% in total of aluminium,magnesium, titanium and zirconium; and not more than 7.5% of magnesium, titanium and zirconium.
Category 2 not more than 7.5% magnesium
Category 3 no requirement