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BS EN 60079-1:2014:2018 Edition

BS EN 60079-1:2014:2018 Edition

$215.11

Explosive atmospheres – Equipment protection by flameproof enclosures “d”

Published By Publication Date Number of Pages
BSI 2018 98
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This part of IEC 60079 contains specific requirements for the construction and testing of electrical equipment with the type of protection flameproof enclosure “d”, intended for use in explosive gas atmospheres.

This standard supplements and modifies the general requirements of IEC 60079‑0 . Where a requirement of this standard conflicts with a requirement of IEC 60079‑0 , the requirement of this standard will take precedence.

PDF Catalog

PDF Pages PDF Title
2 undefined
7 English
CONTENTS
13 FOREWORD
18 Explanations:
21 1 Scope
2 Normative references
22 3 Terms and definitions
24 4 Level of protection (equipment protection level, EPL)
4.1 General
4.2 Requirements for level of protection “da”
25 4.3 Requirements for level of protection “db”
4.4 Requirements for level of protection “dc”
4.4.1 General
4.4.2 Construction of “dc” devices
4.4.3 Tests for “dc” devices
Tables
Table 1 – Number of non-transmission tests for level of protection “da”
26 5 Flameproof joints
5.1 General requirements
27 5.2 Non-threaded joints
5.2.1 Width of joints (L)
5.2.2 Gap (i)
5.2.3 Spigot joints
Figures
Figure 1 – Example of construction for indirect checking of a flanged Group I flameproof joint
28 5.2.4 Holes in joint surfaces
Figure 2 – Spigot joints
29 Figure 3 – Holes in surfaces of flanged joints, example 1
Figure 4 – Holes in surfaces of flanged joints, example 2
Figure 5 – Holes in surfaces of flanged joints, example 3
Figure 6 – Holes in surfacesof spigot joints, example 1
30 5.2.5 Conical joints
5.2.6 Joints with partial cylindrical surfaces (not permitted for Group IIC)
Figure 7 – Holes in surfacesof spigot joints, example 2
Figure 8 – Holes in surfacesof spigot joints, example 3
31 5.2.7 Flanged joints for acetylene atmospheres
5.2.8 Serrated joints
Figure 9 – Examples of joint constructions
32 5.2.9 Multi-step joints
33 Table 2 – Minimum width of joint and maximum gap for enclosures of Groups I, IIA and IIB
34 Table 3 – Minimum width of joint and maximum gap for Group IIC enclosures
35 5.3 Threaded joints
5.4 Gaskets (including O-rings)
Table 4 – Cylindrical threaded joints
Table 5 – Taper threaded joints a, c
36 Figure 10 – Illustration of therequirements concerning gaskets –Example 1
Figure 11 – Illustration of therequirements concerning gaskets –Example 2
Figure 12 – Illustration of therequirements concerning gaskets –Example 3
Figure 13 – Illustration of therequirements concerning gaskets –Example 4
Figure 14 – Illustration of therequirements concerning gaskets –Example 5
Figure 15 – Illustration of therequirements concerning gaskets –Example 6
37 5.5 Equipment using capillaries
6 Sealed joints
6.1 Cemented joints
6.1.1 General
6.1.2 Mechanical strength
Figure 16 – Illustration of the requirements concerning gaskets – Example 7
38 6.1.3 Width of cemented joints
6.2 Fused glass joints
6.2.1 General
6.2.2 Width of fused glass joints
7 Operating rods
39 8 Supplementary requirements for shafts and bearings
8.1 Joints of shafts
8.1.1 General
8.1.2 Cylindrical joints
8.1.3 Labyrinth joints
8.1.4 Joints with floating glands
40 Figure 17 – Example of cylindrical joint for shaft of rotating electrical machine
Figure 18 – Example of labyrinth joint for shaft of rotating electrical machine
Figure 19 – Example of joint with floating gland for shaft of rotating electrical machine
41 8.2 Bearings
8.2.1 Sleeve bearings
8.2.2 Rolling-element bearings
9 Light-transmitting parts
Figure 20 – Joints of shaft glands of rotating electrical machines
42 10 Breathing and draining devices which form part of a flameproof enclosure
10.1 General
10.2 Openings for breathing or draining
10.3 Composition limits
10.4 Dimensions
10.5 Elements with measurable paths
10.6 Elements with non-measurable paths
43 10.7 Removable devices
10.7.1 General
10.7.2 Mounting arrangements of the elements
10.8 Mechanical strength
10.9 Breathing devices and draining devices when used as Ex components
10.9.1 General
10.9.2 Mounting arrangements of the elements and components
10.9.3 Type tests for breathing and draining devices used as Ex components
44 Figure 21 – Component test rig for breathing and draining devices
46 10.9.4 Ex component certificate
47 11 Fasteners and openings
48 12 Materials
49 13 Entries for flameproof enclosures
13.1 General
13.2 Threaded holes
13.3 Non-threaded holes (for Group I only)
50 13.4 Cable glands
13.5 Conduit sealing devices
Figure 22 – Example of possible documentation
51 13.6 Plugs and sockets and cable couplers
52 13.7 Bushings
13.8 Blanking elements
14 Verification and tests
53 15 Type tests
15.1 General
Table 6 – Conditions for the determination of maximum surface temperature
54 15.2 Tests of ability of the enclosure to withstand pressure
15.2.1 General
15.2.2 Determination of explosion pressure (reference pressure)
55 Table 7 – Test factors for reduced ambient conditions
56 Figure 23 – Example of a regular shaped waveform
Figure 24 – Example of an irregular shaped waveform
57 15.2.3 Overpressure test
Table 8 – Relative pressures for small equipment
58 15.3 Test for non-transmission of an internal ignition
15.3.1 General
59 Table 9 – Reduction in length of a threaded joint for non-transmission test
Table 10 – Test factors to increase pressure or test gap (iE)
Table 11 – Minimum distance of obstructions from flameproof “d” flange openings
60 15.3.2 Electrical equipment of Groups I, IIA and IIB
Table 12 – Gas/air mixtures
61 15.3.3 Electrical equipment of Group lIC
62 15.4 Tests of flameproof enclosures with breathing and draining devices
15.4.1 General
15.4.2 Tests of ability of the enclosure to withstand pressure
63 15.4.3 Thermal tests
15.4.4 Test for non-transmission of an internal ignition
64 15.5 Tests for “dc” devices
15.5.1 General
15.5.2 Preparation of “dc” samples
15.5.3 Test conditions for “dc” devices
65 16 Routine tests
16.1 General
Table 13 – Static pressures
66 16.2 Enclosures not incorporating a welded construction
16.3 Enclosures incorporating a welded construction
16.4 Bushings not specific to one flameproof enclosure
16.5 Acceptance criteria
16.6 Batch testing
67 17 Switchgear for Group I
17.1 General
17.2 Means of isolation
17.2.1 General
17.3 Doors or covers
17.3.1 Quick-acting doors or covers
17.3.2 Doors or covers fixed by screws
68 17.3.3 Threaded doors or covers
18 Lampholders and Iamp caps
18.1 General
18.2 Device preventing lamps working loose
18.3 Holders and caps for lamps with cylindrical caps
18.4 Holders for lamps with threaded caps
19 Non-metallic enclosures and non-metallic parts of enclosures
19.1 General
69 19.2 Resistance to tracking and creepage distances on internal surfaces of the enclosure walls
19.3 Requirements for type tests
19.4 Test of erosion by flame
20 Marking
20.1 General
70 20.2 Caution and warning markings
20.3 Informative markings
21 Instructions
Table 14 – Text of caution or warning markings
Table 15 – Text of informative markings
71 Annex A (normative) Additional requirements for crimped ribbon elements and multiple screen elements of breathing and draining devices
72 Annex B (normative) Additional requirements for elements, with non-measurable paths of breathing and draining devices
B.1 Sintered metal elements
B.2 Pressed metal wire elements
73 B.3 Metal foam elements
74 Annex C (normative) Additional requirements for flameproof entry devices
C.1 General
C.2 Constructional requirements
C.2.1 Sealing methods
75 C.2.2 Flameproof joints
76 C.2.3 Constructional requirements for Ex blanking elements
77 Figure C.1 – Examples of blanking elements for unused entries
78 C.2.4 Constructional requirements for Ex thread adapters
C.3 Type tests
C.3.1 Sealing test
79 C.3.2 Test of mechanical strength
Figure C.2 – Device for the sealing tests for cable glands
80 C.3.3 Type tests for Ex blanking elements
81 C.3.4 Type tests for Ex thread adapters
Table C.1 – Tightening torque values, metric
82 Figure C.3 – Examples of Ex thread adapters
Table C.2 – Tightening torque values, NPT
83 Annex D (normative) Empty flameproof enclosures as Ex components
D.1 General
D.2 Introductory remarks
D.3 Ex component enclosure requirements
85 D.4 Utilization of an Ex component enclosure certificate to prepare an equipment certificate
D.4.1 Procedure
D.4.2 Application of the schedule of limitations
86 Annex E (normative) Cells and batteries used in flameproof “d” enclosures
E.1 Introductory remarks
E.2 Acceptable electrochemical systems
Table E.1 – Acceptable primary cells
87 E.3 General requirements for cells (or batteries) inside flameproof enclosures
E.4 Arrangement of safety devices
E.4.1 Prevention of excessive temperature and cell damage
Table E.2 – Acceptable secondary cells
88 E.4.2 Prevention of cell polarity reversal or reverse charging by another cell in the same battery
E.4.3 Prevention of inadvertent charging of a battery by other voltage sources in the enclosure
Figure E.1 – Fitting of diode arrangement for three cells in series
89 E.5 Recharging of secondary cells inside flameproof enclosures
Figure E.2 – Fitting of blocking diodes to meet E.4.3 (third example)
90 E.6 Rating of protection diodes and reliability of protection devices
91 Annex F (informative) Mechanical properties for screws and nuts
Table F.1 – Mechanical properties for screws and nuts
92 Annex G (normative) Additional requirements for flameproof enclosures withan internal source of release (containment system)
G.1 General
G.2 Release conditions
G.2.1 No release
Figure G.1 – Flameproof enclosure with containment system
93 G.2.2 Limited release of a gas or vapour
G.2.3 Limited release of a liquid
G.3 Design requirements for the containment system
G.3.1 General design requirements
G.3.2 Infallible containment system
94 G.3.3 Containment system with a limited release
G.4 Type tests for the containment system
G.4.1 Overpressure test
G.4.2 Leakage test for an infallible containment system
95 G.4.3 Leakage test for a containment system with a limited release
96 Annex H (normative)Requirements for machines with flameproof “d” enclosures fed from converters
H.1 General
H.2 Construction requirements for bearings
H.3 Temperature requirements
97 Bibliography

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BS EN 60079-1:2014
$215.11