AS/NZS 60079.28:2007

1 - AS/NZS 60079.28:2007 Explosive atmospheres Part 28: Protection of equipment and transmission systems using optical radiation
4 - PREFACE
5 - CONTENTS
6 - INTRODUCTION
7 - 1 Scope
8 - 2 Normative references
8 - 3 Terms and definitions
11 - 4 General requirements
11 - 4.1 Optical equipment
11 - 4.2 Risk levels
11 - 5 Types of protectio
11 - 5.1 General
12 - 5.2 Requirements for inherently safe optical radiation “op is”
14 - 5.3 Requirements for protected optical radiation “op pr”
15 - 5.4 Optical radiation interlock with optical fibre breakage “op sh”
15 - 5.5 Suitability of types of protection
16 - 6 Type verifications and tests
16 - 6.1 Test set-up for ignition tests
16 - 6.2 Reference tes
17 - 6.3 Test mixtures
18 - 6.4 Tests for pulse trains and pulses between 1 ms and 1 s duration
18 - 7 Marking
18 - 7.1 General
18 - 7.2 Marking information
18 - 7.3 Examples of marking
19 - Annex A (normative) Reference test data
20 - Annex B (informative) Ignition mechanisms
25 - Annex C (normative) Ignition hazard assessment
26 - Annex D (informative) Typical optical fibre cable design
27 - Annex E (informative) Introduction of an alternative risk assessment method encompassing “equipment protection levels” for Ex equipment
32 - Bibliography

Explains the potential ignition hazard from equipment using optical radiation intended for use in explosive gas atmospheres. It also covers equipment, which itself is located outside but its emitted optical radiation enters such atmospheres. It describes precautions and requirements to be taken when using optical radiation transmitting equipment in explosive gas atmospheres.

First published as AS/NZS 60078.29:2007.