1. Hazardous Area Environments
Timefiller Part 1

2. ATEX Directives ?
95 &
137
95 - Intended to remove technical barriers to trade in Europe. Equipment design.
137 - Improving the H&S of workers – UK DSEAR
How many groups ?
How many categories in Group II ? I
Below ground (Mining) II
Above ground
(Surface Industries)
What is the Zone relationship? 1 2 Ga
Are EPL’s
European or
International? 1 Gb
International G ? 3 2 Gc
Gas
What is the EPL relationship? D
Dust
II 2 G
Where can I install
this equipment ?
Zone 1 & 2
EPL Gb & Gc

3. CERTIFICATION MARKING
Protection Method
‘d’ = Flameproof
Explosion
Protected
Temperature
Classification
T6 = 85 Deg. C
EEx d IIC T6 Gb
Compliance with
European Standards
Apparatus group
with sub-division
Equipment
Protection
Level =
High Level

4. Which of the gas groupings shown below does Propane fall into?
A I
B IIA
C IIB
D IIC B B

5. Which of the following best describes the marking for a Zone 0 area on a drawing?
A Continuously present, or present for long periods.
Small Circles
B Refer to the key of the drawing.
C Likely to be present during normal operation.
45º Crossed
Hatch
D Not likely to be present during normal operation but if it does, it’s duration will be for a short
45º Slanted
Lines A
Note, Key words: Always , Likely and Unlikely
Zones deal with “probabilities” of explosive gas being present.
What do EPL’s deal with?
By performing a RISK ASSESSMENT the “consequences” of an ignition of explosive gas may cause the requirement to differ from the normal.

6. Where can I install the following equipment into?
EEx d
EEx ia
EEx e
EEx n
EEx ib
EPL Gb (Cat 2G) Zone 1
EEx ia
EPL Ga (Cat 1G) Zone 0 B
Why not D ? The question is for Gas and Vapour not DUST 20/21
EEx d
EEx e
EEx ib
EEx ia
EPL Gc (Cat 3G) Zone 2

7. What gas group can install the following equipment into?
IIA
IIB
IIC II I
Propane Area
Hydrogen/
Acetylene
Area
IIB
IIC II
Ethylene
Area
IIC
Mining – Below Ground II

8. TEMPERATURE CLASSIFICATION RELATING TO EQUIPMENT PUT IN THE CORRECT ORDER?
MAXM SURFACE
TEMPERATURE T1
135 Deg. C
450 Deg. C T2
300 Deg. C
100 Deg. C
450 Deg. C T3
200 Deg. C
300 Deg. C T4
135 Deg. C
85 Deg. C T5
100 Deg. C
200 Deg. C T6
85 Deg. C

9. What Temperature area can the following equipment be installed into?
EPL Gb T6
EPL Ga T3 T6
EPL Gc T1 B
Why not D ? The question is for Gas and Vapour not DUST 20/21 T5 T4 T3 T6

10. What is the clearance distance between the two points shown?
a. 10 mm b. 5 mm c. 6 mm d. 3 mm
GAP
Ex d enclosure IIC
What zones can I fit Exd into?
a. Zone 0 only
b. Zone 1 only
c. Zone 22 only
d. Zone 1 & 2
40mm
IIC
Which Ex d gland should I fit to the enclosure?

11. Glands What do these X’s mean?
HAWKE 501/453UNI O M II2GD Exd IIC ExEII
ExtD ºC Baseefa 06ATEX0057X A21 IP66
IECEXBAS X OL7 ONA UK NEMA 4X
What do these X’s mean?
HAWKE 501/453UNI O M II2GD Exd IIC ExEII
ExtD ºC Baseefa 06ATEX0057X A21 IP66
IECEXBAS X OL7 ONA UK NEMA 4X
For use with fixed equipment & can have additional clamping.
Ex d Metal
Threaded Hole
10 mm
Ex e Plastic
Clearance Hole
Ex e Metal
Clearance Hole
Gland fitted to an Ex n box in 2008 what are the requirements?
Gland fitted to an Ex e box in 2004 what are the requirements?
Must be Certified to the minimum
Standard IEC
Can be Uncertified & meets the impact and IP standards of Ex e B
Ex de Motor
If I install this motor today what gland do I need to fit to maintain the current standard for the Ex e terminal box?
Certified Ex d
Uncertified E1W
Certified Ex d or Ex e
Certified Ex n

12. Cables etc What voltage must the cable be capable of withstanding?
500V ac
750V dc
500V ac and 750V dc
500V ac or 750V dc
Armour Earth
Cable Screen Earth
Pair Screen Earth
Pair Conductors
Cable construction:
Should be sheathed with ****** plastic, thermo******* , or elastomeric material. They should be ******** , have extruded bedding and, where necessary fillers should be non- *********** .
thermo
setting
circular
hygroscopic
The build up of static on plastic coated cable tray can be reduced how?
By limitation of the surface area.
Thermoplastic – Plastics - Nylon, Polystyrene, Polyethylene
Thermosetting - Bakelite
Elastomeric – Rubber more flexible
By choice of material so that it does not exceed 1GΩ insulation resistance.
How should I protect stranded ends separating?
Fine strands/Multi-stranded
Fit cable lugs or
core-end sleeves

13. Pressurisation
If an enclosure contains equipment not meeting EPL Gc without pressurisation.
What action must occur if the pressure systems fails?
EPL Gc
Zone 1
Zone 2
Alarm & Isolate all equipment.
Alarm & immediate action to restore.
No Action.
Alarm & automatically isolate all equipment.
If this is marked Ex ‘pz’
what zone will it be in?
Marked as Ex ?
‘py’
Marked as Ex ?
‘px’
Where does the air for pressurisation have to be drawn from?
Non Hazardous
Area B
3G Equipment
EPL Gc
no Sparks
Area – EPL Gc
Equipment – 3G
Enclosure – No sparks
What in the minimum protection??
Ex px, Ex py, Ex pz, None

14. IS ? 1234 II 1 G Ex ia IIC T4 What is this Control Loop? ? Ex ib Ex ia
Safety device name?
Zener Barrier
What is this Control Loop?
Safe Area ?
Zone ? 1
Ex ib
Ex ia ib
250V r.m.s ia ?
Marking ?
[ ]
EEx ia
What would we connect the cable screen to?
2 x 1.5 ² mm
4 ² mm or
CSA ?
Safety device name?
Galvanic Isolator
If this device is in an enclosure
What protection type can the enclosure be?
EEx d
EEx p
Therefore - EEx d [ib]
What zone can this equipment be
installed into?
[ ]
Ex ib
Zone ? 1
This meter is marked
Can I use it on IS circuit in a Zone 0/EPL Ga?
II 1 G Ex ia IIC T4 No
this instrument needs to be ‘Authorised’ for use on the appropriate circuit.

15. People From the standard IEC 60079-14
Technicians – Require to have FAMILIARITY with the particular techniques to be employed in the selection and erection of equipment.
Technicians – Require EVIDENCE of having the necessary skills for the scope of work, competence across a range of activities and relevant Knowledge and understanding.
Technicians – Require to have the PRACTICAL skills necessary for the preparation & installation of the relevant concepts of protection . B

16. What Type of inspection would use test equipment such as an insulation resistance meter?
Sample D C V
Grades
Check that:
Types ?
Initial
Periodic
Sample
With transportable and portable apparatus, what is the maximum period between inspections?
1 year ?
etailed
lose
isual
Equipment circuit identification is available
There are no visible unauthorised modifications.
There are no unauthorised modifications.
Equipment circuit identification is correct.
Motor fans have sufficient clearance to enclosure and/or covers.
IS Installation is clearly labelled. B
What is required for the Inspection grade?
Tools
Tools
Steps
Steps
Area
Class
Drawing
Area
Class
Drawing

17. Online Exam Prep Equipment Not allowed in the exam room:
Equipment allowed in the exam room:
Pen
Mobile Phones, Books, Notes 1 2 4 3 5 6 7 8 9 10
A technician is testing a IS circuit cables with 500Vac or 750Vdc for
resistance of the cable insulation what inspection would be carried out?
Periodic Inspection
Visual Inspection
Sample Inspection
Close Inspection
Question 5
Periodic Inspection
Sample Inspection

18. Question 6 Bla Bla Bla...? Answer A Answer B Answer C Answer D 1 2 4 3
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