Hazardous Area Environments Timefiller Part 1

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 1234 II 2 G Where can I install this equipment ? Zone 1 & 2 EPL Gb & Gc

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

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

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.

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

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

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

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

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?

Glands What do these X’s mean? HAWKE 501/453UNI O M20 II2GD Exd IIC ExEII ExtD -60+80ºC Baseefa 06ATEX0057X A21 IP66 IECEXBAS06.0014X OL7 ONA UK NEMA 4X 08 1180 What do these X’s mean? HAWKE 501/453UNI O M20 II2GD Exd IIC ExEII ExtD -60+80ºC Baseefa 06ATEX0057X A21 IP66 IECEXBAS06.0014X OL7 ONA UK NEMA 4X 08 1180 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 60079-0 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

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

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

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? 1234 II 1 G Ex ia IIC T4 No this instrument needs to be ‘Authorised’ for use on the appropriate circuit.

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

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

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

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