This part of IEC 60079 specifies the general requirements for construction, testing and marking of Ex Equipment and Ex Components intended for use in explosive atmospheres.<\/p>\n
The standard atmospheric conditions (relating to the explosion characteristics of the atmosphere) under which it may be assumed that Ex Equipment can be operated are:<\/p>\n
temperature \u201320 \u00b0C to +60 \u00b0C;<\/p>\n<\/li>\n
pressure 80 kPa (0,8 bar) to 110 kPa (1,1 bar); and<\/p>\n<\/li>\n
air with normal oxygen content, typically 21 % v\/v.<\/p>\n<\/li>\n<\/ul>\n
This part of IEC 60079 and other standards supplementing this standard specify additional test requirements for Ex Equipment operating outside the standard temperature range, but further additional consideration and additional testing may be required for Ex Equipment operating outside the standard atmospheric pressure range and standard oxygen content. Such additional testing may be particularly relevant with respect to Types of Protection that depend on quenching of a flame such as \u2018flameproof enclosures \u201cd\u201d\u2019 (IEC 60079-1) or limitation of energy, \u2018intrinsic safety \u201ci\u201d\u2019 (IEC 60079-11).<\/p>\n
\nNOTE 1 Although the standard atmospheric conditions above give a temperature range for the atmosphere of -20 \u00b0C to +60 \u00b0C, the normal ambient temperature range for the Ex Equipment is \u201320 \u00b0C to +40 \u00b0C, unless otherwise specified and marked. See 5.1.1. It is considered that \u201320 \u00b0C to +40 \u00b0C is appropriate for many items of Ex Equipment and that to manufacture all Ex Equipment to be suitable for a standard atmosphere upper ambient temperature of +60 \u00b0C would place unnecessary design constraints.<\/p>\n
NOTE 2 Requirements given in this standard result from an ignition hazard assessment made on equipment. The ignition sources taken into account are those found associated with this type of equipment, such as hot surfaces, electromagnetic radiation, mechanically generated sparks, mechanical impacts resulting in thermite reactions, electrical arcing and static electric discharge in normal industrial environments.<\/p>\n
NOTE 3 Where an explosive gas atmosphere and a combustible dust atmosphere are, or can be, present at the same time, the simultaneous presence of both often warrants additional protective measures. Additional guidance on the use of Ex Equipment in hybrid mixtures (mixture of a flammable gas or vapour with a combustible dust or combustible flyings) is given in IEC 60079-14.<\/p>\n<\/blockquote>\n
IEC 60079 does not specify requirements for safety, other than those directly related to the explosion risk.<\/p>\n
Ignition sources like adiabatic compression, shock waves, exothermic chemical reaction, selfignition of dust, naked flames and hot gases\/liquids, are not addressed by this standard.<\/p>\n
\nNOTE 4 Although outside the scope of this standard, such equipment would typically be subjected to a hazard analysis that identifies and lists all of the potential sources of ignition by the equipment and the measures to be applied to prevent them becoming effective. See ISO\/IEC 80079-36.<\/p>\n<\/blockquote>\n
This document is supplemented or modified by the following parts and technical specifications:<\/p>\n
\n
- \n
IEC 60079-1: Gas \u2013 Flameproof enclosures “d”;<\/p>\n<\/li>\n
- \n
IEC 60079-2: Gas and dust \u2013 Pressurized enclosure “p”;<\/p>\n<\/li>\n
- \n
IEC 60079-5: Gas \u2013 Powder filling “q”;<\/p>\n<\/li>\n
- \n
IEC 60079-6: Gas \u2013 Liquid immersion “o”;<\/p>\n<\/li>\n
- \n
IEC 60079-7: Gas \u2013 Increased safety “e”;<\/p>\n<\/li>\n
- \n
IEC 60079-11: Gas and dust \u2013 Intrinsic safety “i”;<\/p>\n<\/li>\n
- \n
IEC 60079-13: Gas and dust \u2013 Equipment protection by pressurized room \u201cp\u201d & artificially ventilated room \u201cv\u201d;<\/p>\n<\/li>\n
- \n
IEC 60079-15: Gas \u2013 Type of protection \u201cn\u201d;<\/p>\n<\/li>\n
- \n
IEC 60079-18: Gas and dust \u2013 Encapsulation “m”;<\/p>\n<\/li>\n
- \n
IEC 60079-25: Gas and dust \u2013 Intrinsically safe electrical systems<\/p>\n<\/li>\n
- \n
IEC 60079-26: Gas \u2013 Equipment with equipment protection level (EPL) Ga<\/p>\n<\/li>\n
- \n
IEC 60079-28: Gas and dust \u2013 Protection of equipment and transmission systems using optical radiation<\/p>\n<\/li>\n
- \n
IEC 60079-29-1: Gas detectors \u2013 Performance requirements of detectors for flammable gases<\/p>\n<\/li>\n
- \n
IEC 60079-29-4: Gas detectors \u2013 Performance requirements of open path detectors for flammable gases<\/p>\n<\/li>\n
- \n
IEC\/IEEE 60079-30-1: Gas and dust \u2013 Electrical resistance trace heating \u2013 General and testing requirements.<\/p>\n<\/li>\n
- \n
IEC 60079-31: Dust \u2013 Protection by enclosure \u201ct\u201d<\/p>\n<\/li>\n
- \n
IEC 60079-33: Gas and dust \u2013 Special protection \u201cs\u201d<\/p>\n<\/li>\n
- \n
IEC 60079-35-1: Caplights for use in mines susceptible to firedamp \u2013 General requirements \u2013 Construction and testing in relation to the risk of explosion<\/p>\n<\/li>\n
- \n
IEC TS 60079-39: Gas \u2013 Intrinsically safe systems with electronically controlled spark duration limitation<\/p>\n<\/li>\n
- \n
IEC TS 60079-40: Gas \u2013 Requirements for process sealing between flammable process fluids and electrical systems<\/p>\n<\/li>\n
- \n
ISO 80079-36: Gas and dust \u2013 Non-electrical equipment for explosive atmospheres \u2013 Basic method and requirements<\/p>\n<\/li>\n<\/ul>\n
This document, along with the additional parts of IEC 60079 mentioned above, is not applicable to the construction of<\/p>\n
\n
- \n
electromedical apparatus,<\/p>\n<\/li>\n
- \n
shot-firing exploders,<\/p>\n<\/li>\n
- \n
test devices for exploders, and<\/p>\n<\/li>\n
- \n
shot-firing circuits.<\/p>\n<\/li>\n<\/ul>\n
PDF Catalog<\/h4>\n
\n
\n PDF Pages<\/th>\n PDF Title<\/th>\n<\/tr>\n \n 2<\/td>\n undefined <\/td>\n<\/tr>\n \n 19<\/td>\n English
CONTENTS <\/td>\n<\/tr>\n\n 25<\/td>\n FOREWORD <\/td>\n<\/tr>\n \n 32<\/td>\n 1 Scope <\/td>\n<\/tr>\n \n 33<\/td>\n 2 Normative references <\/td>\n<\/tr>\n \n 35<\/td>\n 3 Terms and definitions <\/td>\n<\/tr>\n \n 37<\/td>\n Figures
Figure 1 \u2013 Typical battery examples <\/td>\n<\/tr>\n\n 38<\/td>\n Figure 2 \u2013 Typical battery compartment <\/td>\n<\/tr>\n \n 39<\/td>\n Figure 3 \u2013 Typical replaceable battery pack <\/td>\n<\/tr>\n \n 53<\/td>\n 4 Equipment grouping
4.1 General
4.2 Group I
4.3 Group II
4.4 Group III <\/td>\n<\/tr>\n\n 54<\/td>\n 4.5 Equipment for a particular explosive gas atmosphere
5 Temperatures
5.1 Environmental influences
5.1.1 Ambient temperature
5.1.2 External source of heating or cooling
5.2 Service temperature
Tables
Table 1 \u2013 Ambient temperatures in service and additional marking <\/td>\n<\/tr>\n\n 55<\/td>\n 5.3 Maximum surface temperature
5.3.1 Determination of maximum surface temperature
5.3.2 Limitation of maximum surface temperature
Table 2 \u2013 Classification of maximum surface temperatures for Group II electrical equipment <\/td>\n<\/tr>\n\n 56<\/td>\n 5.3.3 Small component temperature for Group I or Group II electrical equipment <\/td>\n<\/tr>\n \n 57<\/td>\n 5.3.4 Component temperature of smooth surfaces for Group I or Group II electrical equipment
Table 3 \u2013 Assessment of temperature classification according to component size
Table 4 \u2013 Assessment of temperature classification Component surface area \u2265 20 mm2 <\/td>\n<\/tr>\n\n 58<\/td>\n 6 Requirements for all equipment
6.1 General
6.2 Mechanical strength of equipment
6.3 Opening times <\/td>\n<\/tr>\n\n 59<\/td>\n 6.4 Circulating currents in enclosures (e.g. of large electric machines)
6.5 Gasket retention
6.6 Electromagnetic and ultrasonic energy radiating equipment
6.6.1 General
6.6.2 Radio frequency sources <\/td>\n<\/tr>\n\n 60<\/td>\n 6.6.3 Ultrasonic sources
Table 5 \u2013 Threshold power
Table 6 \u2013 Threshold energy <\/td>\n<\/tr>\n\n 61<\/td>\n 6.6.4 Lasers, luminaires, and other non-divergent continuous wave optical sources
7 Non-metallic enclosures and non-metallic parts of enclosures
7.1 General
7.1.1 Applicability
7.1.2 Specification of materials <\/td>\n<\/tr>\n\n 62<\/td>\n 7.2 Thermal endurance
7.2.1 Tests for thermal endurance <\/td>\n<\/tr>\n\n 63<\/td>\n 7.2.2 Material selection
7.2.3 Alternative qualification of elastomeric sealing O-rings
7.3 Resistance to ultraviolet light <\/td>\n<\/tr>\n\n 64<\/td>\n 7.4 Electrostatic charges on external non-metallic materials
7.4.1 Applicability
7.4.2 Avoidance of a build-up of electrostatic charge for Group I or Group II <\/td>\n<\/tr>\n\n 65<\/td>\n Table 7 \u2013 Limitation of surface areas <\/td>\n<\/tr>\n \n 66<\/td>\n 7.4.3 Avoidance of a build-up of electrostatic charge for Group III
Table 8 \u2013 Maximum diameter or width
Table 9 \u2013 Limitation of thickness of non-metallic layer
Table 10 \u2013 Maximum acceptable transferred charge <\/td>\n<\/tr>\n\n 67<\/td>\n 7.5 Attached external conductive parts <\/td>\n<\/tr>\n \n 68<\/td>\n 8 Metallic enclosures and metallic parts of enclosures
8.1 Material composition
8.2 Group I
8.3 Group II
Table 11 \u2013 Maximum capacitance of unearthed conductive parts <\/td>\n<\/tr>\n\n 69<\/td>\n 8.4 Group III
8.5 Copper Alloys
9 Fasteners
9.1 General <\/td>\n<\/tr>\n\n 70<\/td>\n 9.2 Special fasteners
9.3 Holes for special fasteners
9.3.1 Thread engagement
9.3.2 Tolerance and clearance
Figure 4 \u2013 Tolerances and clearance for threaded fasteners <\/td>\n<\/tr>\n\n 71<\/td>\n 9.4 Hexagon socket set screws
10 Interlocking devices
11 Bushings
12 (Reserved for future use)
13 Ex Components
13.1 General
Figure 5 \u2013 Contact surface under head of fastener with a reduced shank <\/td>\n<\/tr>\n\n 72<\/td>\n 13.2 Mounting
13.3 Internal mounting
13.4 External mounting
13.5 Ex Component certificate
14 Connection facilities
14.1 General <\/td>\n<\/tr>\n\n 73<\/td>\n 14.2 Type of protection
14.3 Creepage and clearance
15 Connection facilities for earthing or bonding conductors
15.1 Equipment requiring earthing or bonding
15.1.1 Internal earthing
15.1.2 External bonding
15.2 Equipment not requiring earthing
15.3 Size of protective earthing conductor connection <\/td>\n<\/tr>\n\n 74<\/td>\n 15.4 Size of equipotential bonding conductor connection
15.5 Protection against corrosion
15.6 Secureness of electrical connections
15.7 Internal earth continuity plate
16 Entries into enclosures
16.1 General
16.2 Identification of entries
Table 12 \u2013 Minimum cross-sectional area of PE conductors <\/td>\n<\/tr>\n\n 75<\/td>\n 16.3 Cable glands
16.4 Blanking elements
16.5 Thread adapters <\/td>\n<\/tr>\n\n 76<\/td>\n 16.6 Temperature at branching point and entry point
16.7 Electrostatic charges of cable sheaths
Figure 6 \u2013 Cable gland
Figure 7 \u2013 Conduit entry <\/td>\n<\/tr>\n\n 77<\/td>\n 17 Supplementary requirements for electric machines
17.1 General
17.2 Ventilation
17.2.1 Ventilation openings
17.2.2 Materials for external fans
17.2.3 Cooling fans of rotating electric machines <\/td>\n<\/tr>\n\n 78<\/td>\n 17.2.4 Auxiliary motor cooling fans
17.2.5 Room ventilating fans <\/td>\n<\/tr>\n\n 79<\/td>\n 17.3 Bearings
18 Supplementary requirements for switchgear
18.1 Flammable dielectric
18.2 Disconnectors <\/td>\n<\/tr>\n\n 80<\/td>\n 18.3 Group I \u2013 Provisions for locking
18.4 Doors and covers
19 Reserved for future use
20 Supplementary requirements for external plugs, socket outlets and connectors for field wiring connection
20.1 General <\/td>\n<\/tr>\n\n 81<\/td>\n 20.2 Explosive gas atmospheres
20.3 Explosive dust atmospheres
20.4 Energized plugs
21 Supplementary requirements for luminaires
21.1 General
21.2 Covers for luminaires of EPL Mb, EPL Gb, or EPL Db <\/td>\n<\/tr>\n\n 82<\/td>\n 21.3 Covers for luminaires of EPL Gc or EPL Dc
21.4 Sodium lamps
22 Supplementary requirements for caplights and handlights
22.1 Group I caplights
22.2 Group II and Group III caplights and handlights \u2003 <\/td>\n<\/tr>\n\n 83<\/td>\n 23 Equipment incorporating cells and batteries
23.1 General
23.2 Interconnection of cells to form batteries
23.3 Cell types
Table 13 \u2013 Primary cells <\/td>\n<\/tr>\n\n 85<\/td>\n Table 14 \u2013 Secondary cells <\/td>\n<\/tr>\n \n 86<\/td>\n 23.4 Cells in a battery
23.5 Ratings of batteries
23.6 Interchangeability
23.7 Charging of primary batteries
23.8 Leakage
23.9 Connections
23.10 Orientation
23.11 Replacement of cells or batteries <\/td>\n<\/tr>\n\n 87<\/td>\n 23.12 Replaceable battery pack
24 Documentation
25 Compliance of prototype or sample with documents
26 Type tests
26.1 General
26.2 Test configuration
26.3 Tests in explosive test mixtures <\/td>\n<\/tr>\n\n 88<\/td>\n 26.4 Tests of enclosures
26.4.1 Order of tests <\/td>\n<\/tr>\n\n 90<\/td>\n 26.4.2 Resistance to impact <\/td>\n<\/tr>\n \n 91<\/td>\n 26.4.3 Drop test
Table 15 \u2013 Tests for resistance to impact <\/td>\n<\/tr>\n\n 92<\/td>\n 26.4.4 Acceptance criteria
26.4.5 Degree of protection (IP) by enclosures <\/td>\n<\/tr>\n\n 93<\/td>\n 26.5 Thermal tests
26.5.1 Temperature measurement <\/td>\n<\/tr>\n\n 95<\/td>\n 26.5.2 Thermal shock test
26.5.3 Small component ignition test (Group I and Group II) <\/td>\n<\/tr>\n\n 96<\/td>\n 26.6 Torque test for bushings
26.6.1 Test procedure
Table 16 \u2013 Torque to be applied to the stem of bushing used for connection facilities <\/td>\n<\/tr>\n\n 97<\/td>\n 26.6.2 Acceptance criteria
26.7 Non-metallic enclosures or non-metallic parts of enclosures
26.7.1 General
26.7.2 Test temperatures
26.8 Thermal endurance to heat
Table 17 \u2013 Thermal endurance test <\/td>\n<\/tr>\n\n 98<\/td>\n 26.9 Thermal endurance to cold
26.10 Resistance to UV light
26.10.1 General <\/td>\n<\/tr>\n\n 99<\/td>\n 26.10.2 Light exposure
26.10.3 Acceptance criteria
26.11 Resistance to chemical agents for Group I equipment <\/td>\n<\/tr>\n\n 100<\/td>\n 26.12 Earth continuity <\/td>\n<\/tr>\n \n 101<\/td>\n 26.13 Surface resistance test of parts of enclosures of non-metallic materials
Figure 8 \u2013 Assembly of test sample for earth-continuity test <\/td>\n<\/tr>\n\n 102<\/td>\n 26.14 Measurement of capacitance
26.14.1 General
26.14.2 Test procedure
Figure 9 \u2013 Test piece with painted electrodes <\/td>\n<\/tr>\n\n 103<\/td>\n 26.15 Verification of ratings of ventilating fans
26.16 Alternative qualification of elastomeric sealing O-rings
26.17 Transferred charge test
26.17.1 Test equipment
Figure 10 \u2013 Compression set of an O-ring <\/td>\n<\/tr>\n\n 104<\/td>\n 26.17.2 Test sample
26.17.3 Test procedure <\/td>\n<\/tr>\n\n 105<\/td>\n 27 Routine tests
28 Manufacturer’s responsibility
28.1 Conformity with the documentation <\/td>\n<\/tr>\n\n 106<\/td>\n 28.2 Certificate
28.3 Responsibility for marking
29 Marking
29.1 Applicability
29.2 Location
29.3 General <\/td>\n<\/tr>\n\n 107<\/td>\n 29.4 Ex marking for explosive gas atmospheres <\/td>\n<\/tr>\n \n 109<\/td>\n 29.5 Ex marking for explosive dust atmospheres <\/td>\n<\/tr>\n \n 112<\/td>\n 29.6 Combined types (or levels) of protection
29.7 Multiple types of protection
29.8 Ga equipment using two independent Gb types (or levels) of protection
29.9 Boundary wall
29.10 Ex Components <\/td>\n<\/tr>\n\n 113<\/td>\n 29.11 Small Ex Equipment and small Ex Components
29.12 Extremely small Ex Equipment and extremely small Ex Components
29.13 Warning markings <\/td>\n<\/tr>\n\n 114<\/td>\n 29.14 Cells and batteries
29.15 Electric machines operated with a converter
Table 18 \u2013 Text of warning markings <\/td>\n<\/tr>\n\n 115<\/td>\n 29.16 Examples of marking <\/td>\n<\/tr>\n \n 118<\/td>\n 30 Instructions
30.1 General <\/td>\n<\/tr>\n\n 119<\/td>\n 30.2 Cells and batteries <\/td>\n<\/tr>\n \n 120<\/td>\n 30.3 Electric machines
30.4 Ventilating fans
Table 19 \u2013 Example of type-test converter parameters <\/td>\n<\/tr>\n\n 121<\/td>\n 30.5 Cable glands <\/td>\n<\/tr>\n \n 122<\/td>\n Annexes
Annex A (normative) Supplementary requirements for cable glands
A.1 General
A.2 Constructional requirements
A.2.1 Cable sealing <\/td>\n<\/tr>\n\n 123<\/td>\n A.2.2 Filling compounds
A.2.3 Clamping
A.2.4 Lead-in of cable
Figure A.1 \u2013 Illustration of the terms used for cable glands <\/td>\n<\/tr>\n\n 124<\/td>\n A.2.5 Release by a tool
A.2.6 Fixing
A.2.7 Degree of protection
A.3 Type tests
A.3.1 Tests of clamping of non-armoured and braided cables
Figure A.2 \u2013 Rounded edge of the point of entry of the flexible cable <\/td>\n<\/tr>\n\n 127<\/td>\n A.3.2 Tests of clamping of armoured cables <\/td>\n<\/tr>\n \n 128<\/td>\n A.3.3 Type test for resistance to impact <\/td>\n<\/tr>\n \n 129<\/td>\n A.3.4 Test for degree of protection (IP) of cable glands
Figure A.3 \u2013 Example of rig for resistance to impact test <\/td>\n<\/tr>\n\n 130<\/td>\n A.4 Marking
A.4.1 Marking of cable glands
A.4.2 Identification of cable-sealing rings
A.5 Instructions <\/td>\n<\/tr>\n\n 132<\/td>\n Annex B (normative) Requirements for Ex Components
Table B.1 \u2013 Applicability of clauses to Ex Components <\/td>\n<\/tr>\n\n 135<\/td>\n Annex C (informative) Example of rig for resistance to impact test
Figure C.1 \u2013 Example of rig for resistance to impact test <\/td>\n<\/tr>\n\n 136<\/td>\n Annex D (informative) Electric machines connected to converters <\/td>\n<\/tr>\n \n 137<\/td>\n Annex E (informative) Temperature evaluation of electric machines <\/td>\n<\/tr>\n \n 140<\/td>\n Annex F (informative) Guidance flowchart for tests of non-metallic enclosures or non-metallic parts of enclosures (26.4)
Figure F.1 \u2013 Non-metallic enclosures or non-metallic parts of enclosures <\/td>\n<\/tr>\n\n 141<\/td>\n Annex G (informative) Guidance flowchart for tests of cable glands <\/td>\n<\/tr>\n \n 142<\/td>\n Annex H (informative) Shaft voltages resulting in motor bearing or shaft brush sparking Discharge energy calculation
H.1 General
H.2 Assessment of the risk of ignition using ignition energy calculation <\/td>\n<\/tr>\n\n 143<\/td>\n H.3 Shaft voltage determination for a rotating machine
H.4 Capacitance \u201cC\u201d calculation for a rotating machine
Table H.1 \u2013 Maximum permitted energy <\/td>\n<\/tr>\n\n 145<\/td>\n Figure H.1 \u2013 Capacitance stored in bearing clearance of sleeve bearing Between journal and outer bearing housing
Figure H.2 \u2013 Air-gap between stator and rotor <\/td>\n<\/tr>\n\n 146<\/td>\n H.5 Energy \u201cE\u201d calculation for a rotating machine
H.6 Assessment using reference curves
Figure H.3 \u2013 Typical surfaces that form capacitorsfrom the motor shaft to ground <\/td>\n<\/tr>\n\n 147<\/td>\n Figure H.4 \u2013 Capacitive ignition curves <\/td>\n<\/tr>\n \n 148<\/td>\n Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Explosive atmospheres – Equipment. General requirements<\/b><\/p>\n
\n\n
\n Published By<\/td>\n Publication Date<\/td>\n Number of Pages<\/td>\n<\/tr>\n \n BSI<\/b><\/a><\/td>\n 2018<\/td>\n 156<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":239372,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2641],"product_tag":[],"class_list":{"0":"post-239367","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-bsi","8":"first","9":"instock","10":"sold-individually","11":"shipping-taxable","12":"purchasable","13":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/239367","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/239372"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=239367"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=239367"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=239367"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}