ДСТУ EN 60079-1:2017 Вибухонебезпечні середовища. Частина 1. Електричне устатковання. Вид вибухозахисту: вибухобезпечна оболонка d (EN 60079-1:2014, IDT)

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EN 60079-1:2014

Explosive atmospheres —
Part 1: Equipment protection by flameproof enclosures «d»

прийнято як національний стандарт
методом «підтвердження» за позначенням
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ДСТУ EN 60079-1:2017
(EN 60079-1:2014, IDT)

Вибухонебезпечні середовища.
Частина 1. Електричне устатковання.
Вид вибухозахисту: вибухобезпечна оболонка «d»

З наданням чинності від 2017-07-26

CONTENTS

1 Scope

2 Normative references

3 Terms and definitions

4 Level of protection (equipment protection level, EPL)

4.1 General

4.2 Requirements for level of protection “da”

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

5 Flameproof joints

5.1 General requirements

5.2 Non-threaded joints

5.2.1 Width of joints (L)

5.2.2 Gap (i)

5.2.3 Spigot joints

5.2.4 Holes in joint surfaces

5.2.5 Conical joints

5.2.6 Joints with partial cylindrical surfaces (not permitted for Group IIC)

5.2.7 Flanged joints for acetylene atmospheres

5.2.8 Serrated joints

5.2.9 Multi-step joints

5.3 Threaded joints

5.4 Gaskets (including O-rings)

5.5 Equipment using capillaries

6 Sealed joints

6.1 Cemented joints

6.1.1 General

6.1.2 Mechanical strength

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

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

8.2 Bearings

8.2.1 Sleeve bearings

8.2.2 Rolling-element bearings

9 Light-transmitting parts

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

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

10.9.4 Ex component certificate

11 Fasteners and openings

12 Materials

13 Entries for flameproof enclosures

13.1 General

13.2 Threaded holes

13.3 Non-threaded holes (for Group I only)

13.4 Cable glands

13.5 Conduit sealing devices

13.6 Plugs and sockets and cable couplers

13.7 Bushings

13.8 Blanking elements

14 Verification and tests

15 Type tests

15.1 General

15.2 Tests of ability of the enclosure to withstand pressure

15.2.1 General

15.2.2 Determination of explosion pressure (reference pressure)

15.2.3 Overpressure test

15.3 Test for non-transmission of an internal ignition

15.3.1 General

15.3.2 Electrical equipment of Groups I, IIA and IIB

15.3.3 Electrical equipment of Group lIC

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

15.4.3 Thermal tests

15.4.4 Test for non-transmission of an internal ignition

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

16 Routine tests

16.1 General

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

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

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

19.2 Resistance to tracking and creepage distances on internal surfaces of the enclos-ure walls

19.3 Requirements for type tests

19.4 Test of erosion by flame

20 Marking

20.1 General

20.2 Caution and warning markings

20.3 Informative markings

21 Instructions

Annex A (normative) Additional requirements for crimped ribbon elements and multiple screen elements of breathing and draining devices

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

B.3 Metal foam elements

Annex C (normative) Additional requirements for flameproof entry devices

C.1 General

C.2 Constructional requirements

C.2.1 Sealing methods

C.2.2 Flameproof joints

C.2.3 Constructional requirements for Ex blanking elements

C.2.4 Constructional requirements for Ex thread adapters

C.3 Type tests

C.3.1 Sealing test

C.3.2 Test of mechanical strength

C.3.3 Type tests for Ex blanking elements

C.3.4 Type tests for Ex thread adapters

Annex D (normative) Empty flameproof enclosures as Ex components

D.1 General

D.2 Introductory remarks

D.3 Ex component enclosure requirements

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

Annex E (normative) Cells and batteries used in flameproof “d” enclosures

E.1 Introductory remarks

E.2 Acceptable electrochemical systems

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

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

E.5 Recharging of secondary cells inside flameproof enclosures

E.6 Rating of protection diodes and reliability of protection devices

Annex F (informative) Mechanical properties for screws and nuts

Annex G (normative) Additional requirements for flameproof enclosures with an internal source of release (containment system)

G.1 General

G.2 Release conditions

G.2.1 No release

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

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

G.4.3 Leakage test for a containment system with a limited release

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

Bibliography

Figure 1 – Example of construction for indirect checking of a flanged Group I flameproof joint

Figure 2 – Spigot joints

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 surfaces of spigot joints, example 1

Figure 7 – Holes in surfaces of spigot joints, example 2

Figure 8 – Holes in surfaces of spigot joints, example 3

Figure 9 – Examples of joint constructions

Figure 10 – Illustration of the requirements concerning gaskets – Example 1

Figure 11 – Illustration of the requirements concerning gaskets – Example 2

Figure 12 – Illustration of the requirements concerning gaskets – Example 3

Figure 13 – Illustration of the requirements concerning gaskets – Example 4

Figure 14 – Illustration of the requirements concerning gaskets – Example 5

Figure 15 – Illustration of the requirements concerning gaskets – Example 6

Figure 16 – Illustration of the requirements concerning gaskets – Example 7

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

Figure 20 – Joints of shaft glands of rotating electrical machines

Figure 21 – Component test rig for breathing and draining devices

Figure 22 – Example of possible documentation

Figure 23 – Example of a regular shaped waveform

Figure 24 – Example of an irregular shaped waveform

Figure C.1 – Examples of blanking elements for unused entries

Figure C.2 – Device for the sealing tests for cable glands

Figure C.3 – Examples of Ex thread adapters

Figure E.1 – Fitting of diode arrangement for three cells in series

Figure E.2 – Fitting of blocking diodes to meet E.4.3 (third example)

Figure G.1 – Flameproof enclosure with containment system

Table 1 – Number of non-transmission tests for level of protection “da”

Table 2 – Minimum width of joint and maximum gap for enclosures of Groups I, IIA and IIB

Table 3 – Minimum width of joint and maximum gap for Group IIC enclosures

Table 4 – Cylindrical threaded joints

Table 5 – Taper threaded joints ^{a, c}

Table 6 – Conditions for the determination of maximum surface temperature

Table 7 – Test factors for reduced ambient conditions

Table 8 – Relative pressures for small equipment

Table 9 – Reduction in length of a threaded joint for non-transmission test

Table 10 – Test factors to increase pressure or test gap (i_E)

Table 11 – Minimum distance of obstructions from flameproof “d” flange openings

Table 12 – Gas/air mixtures

Table 13 – Static pressures

Table 14 – Text of caution or warning markings

Table 15 – Text of informative markings

Table C.1 – Tightening torque values, metric

Table C.2 – Tightening torque values, NPT

Table E.1 – Acceptable primary cells

Table E.2 – Acceptable secondary cells

Table F.1 – Mechanical properties for screws and nuts