1. Basic Awareness Training for all Staff
Area Classification
Basic Awareness Training for all Staff

2. Explosion! * Flammable Material * plus * Oxygen Oxygen Ignition
* Source of Ignition
Oxygen
Ignition
Flammable Material

3. Properties of Materials
*Flash Point
* Auto Ignition Temperature
* Flammable Range - % Volume
* Gas / Vapour Density - Air = 1
* Source of Ignition
Oxygen
Ignition
Flammable Material

4. ZONE DEFINITIONS * Zone 0
* A Zone in which an explosive atmosphere is continuously
present, or present for long periods. (> 1000 hours per year)
* Zone 1
* A Zone in which an explosive atmosphere is likely to occur
in normal operation.
(10 to 1000 hours per year)

5. ZONE DEFINITIONS * Zone 2
* A Zone in which an explosive atmosphere is not likely to
occur in normal operation, and if it occurs it will only exist
for a short time.
* (1 to 10 hours per year)
* NON-HAZARDOUS AREA
* An area in which an explosive gas/air mixture is not expected
to be present in quantities such as to require special precautions
for the construction, use and maintenance of electrical equipment.

6. ZONE LOCATIONS
* Zone 0
* Inside a solvent tank or solventbased manufacturing vessel
* Zone 1
* Solventbased paint production areas, around mixers, filling machines, dispersers, etc.. Up to 1.5 to 2m from the floor (vapours are heavier than air) .
* Zone 2
* Drum park, warehouse, upper part of production areas, generally around and beyond zone 1, lab benches and floors to 0.5m high.

7. ZONE DEFINITIONS * Zone 2
* A Zone in which an explosive atmosphere is not likely to
occur in normal operation, and if it occurs it will only exist
for a short time.
* (1 to 10 hours per year)
* NON-HAZARDOUS AREA
* An area in which an explosive gas/air mixture is not expected
to be present in quantities such as to require special precautions
for the construction, use and maintenance of electrical equipment.

8. Electrical Equipment Register
Registration.
A Register of all electrical equipment in hazardous areas will be held in the Engineering Department by the Site Responsible Engineer or Responsible Engineer.
Each electrical system shall carry a unique reference number.
Up to date listings are to be maintained.
Any new electrical system must be identified and recorded on the
Register in order to ensure that it is regularly inspected.

9. IMPLICATIONS OF AREA CLASSIFICATIONS
* Use of electrical items
* Avoidance of static electricity - USE EARTHING LEADS
* Control of visitors / equipment (hot work certificate)
* Maintenance work on electrical items. (hot work certification)
* Modification of electrical items
* Damage to electrical items
* Fastening / enclosure of electrical items
* Vehicles (hot work certificate)

10. Area Classification Drawings
Show the location and vertical and horizontal extent of the zone 0, 1 and 2 areas.
Where is your area classification drawing?
Make sure it is up-to-date, and consulted by people issuing permits to work.

11. Labelling of Equipment
E = European Standard
Ex = this equipment has some form of hazardous area protection
ia, ib, d, e, n, etc.. = type of protection
Iia, Iib, Iic = gas group
T1, 2, etc = temperature rating
Certificate number
Certifying body

12. Electrical Equipment * Zone 0 - Ex ia Exs * Zone 1
- Exa Exib Exp Exe Exs Exd
* Zone 2
- Ex N Ex o Ex q

13. EEx i Intrinsic Safety
Instrumentation
Non Haz
Hazardous

14. EEx i Intrinsic Safety Non Haz Hazardous Incapable of causing
an explosion
Inductance and
capacitance are limited
Specific fault
conditions
Non Haz
Hazardous

15. EExd Flameproof Enclosure
Gas Inside
Internal Explosion
Withstands Pressure
No flame or heat transmission
to outside
Strength must not be reduced L W

16. Eexd Flameproof Enclosure
Switchgear
Motors
Light Fittings
Pushbuttons
Ammeters w

17. EExd Flameproof Enclosure
Bolt sizes and length
Covers
Glands
Flange Integrity
Surfaces - Clean-
Cooling w

18. EEx e Increased Safety Enclosure
By Design
No excess temperatures
No Arcs or sparks w

19. EEx e Increased Safety Enclosure
Terminal and connection
boxes
Outer boxes of
devices with other
protection eg. EEx ed
Lights
Motors - Germany w

20. EEx q Powder Filling Enclosure
Transformers,
Capacitors,
Electronic
Assemblies, ie.
Laboratory Balances

21. EEx q Powder Filling Enclosure
Potentially sparking equipment under finely granulated material.
No explosion generated even though there may be a spark

22. EEx p Pressurised Apparatus
Fresh air, inert gas or other suitable gas
Higher pressure than surrounds
Initial purge then maintain the pressure

23. Eex p Pressurised Apparatus
Switch rooms
Control Panels
Fork Lift Trucks
Some individual Instruments
Some Motors

24. Eex o Oil Immersion Enclosure
Potentially sparking parts immersed in oil
The explosive atmosphere cannot reach the incendive parts
Transformers-rarely used now

25. Ex m Moulding Potentially sparking parts are enclosed in Resin
No explosion due to sparking or heating within the resin

26. Ex m Moulding Only small capacity switch gear, control
gear, indicating equipment sensors