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BS EN 60079-26:2015

BS EN 60079-26:2015

$102.76

Explosive atmospheres – Equipment with Equipment Protection Level (EPL) Ga

Published By Publication Date Number of Pages
BSI 2015 22
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This part of IEC 60079 specifies alternative requirements for construction, test and marking for electrical equipment that provides Equipment Protection Level (EPL) Ga when single standardised Types of Protection (e.g. Ex “ia” , Ex “ma”, Ex “da”) cannot be applied. This standard also applies to equipment mounted across a boundary where different Equipment Protection Levels may be required.

EXAMPLE:

Equipment installed in the wall of a storage vessel containing Zone 0 (requiring EPL Ga) inside an area defined as Zone 1 (requiring EPL Gb).

This electrical equipment, within the operational parameters specified by the manufacturer, ensures a very high Level of Protection that includes rare malfunctions related to the equipment or two malfunctions occurring independently of each other.

NOTE

A malfunction may result from a failure of the component parts of the electrical equipment or from anticipated externally applied influences. Two independent malfunctions which may occur more frequently and which, separately, would not create an ignition hazard but which, in combination, could create a potential ignition hazard, are regarded as occurring together to form a rare malfunction.

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 takes precedence.

PDF Catalog

PDF Pages PDF Title
7 Significant changes between this European Standard and EN 60079-26:2007
9 English
CONTENTS
10 1 Scope
2 Normative references
11 3 Terms and definitions
4 Requirements for design and construction
4.1 Protection measures against ignition hazards of the electrical circuits
4.1.1 General
4.1.2 Application of two independent Types of Protection providing EPL Gb
12 4.1.3 Application of a Type of Protection providing EPL Gb and a separation element
13 Figures
Figure 1 – Example of a partition wall with a conductor bushing considered as gas diffusion tight
15 Tables
Table 1 – Separation elements
16 4.2 Equipment with moving parts
4.2.1 Frictional heating
4.2.2 Damage arising from failure of moving parts
4.2.3 Light metals
Figure 2 – Example of a separation element with a cylindrical shaft joint and natural ventilation
17 4.3 Process connection
5 Type tests
5.1 Standardized types of protection
5.2 Separation elements
5.3 Temperature evaluation
18 6 Marking
6.1 General
6.2 Examples of marking
7 Instructions
7.1 Separation elements:
19 7.2 Process connection:
7.3 EPL allocation
20 Bibliography

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BS EN 60079-26:2015
$102.76