CEI CLC/TR 50427 : 2005

Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviations
5 General considerations
6 Transmitters and transmitter output parameters
7 Structures and spark-making mechanisms
8 Ignition of flammable atmospheres
9 Practical measurements and tests
10 Methods of assessment for determining potential
   RF ignition hazards on a plant containing
   hazardous areas
11 Plant safety measures
12 Special cases
Annex A (informative) - Sources of information and
        addresses of some advisory bodies
Annex B (informative) - Electromagnetic radiated fields
        and examples of radiating antenna and unintended
        receiving antenna characteristics
Annex C (informative) - Subdivision of group II flammable
        gases and vapours
Annex D (normative) - Measurement of electromagnetic fields
Annex E (normative) - Methods of measurement on structures
        (on-site tests)
Annex F (informative) - Derivation of vulnerable zone
        distances for Table 5, Table 6 and Table 10
Annex G (informative) - Worked examples of full assessment
        procedure
Annex H (informative) - Ground-wave propagation (vertical
        polarization) - Calculation of field strength
Bibliography

Gives guidance on assessing the potential ignition hazard from the inadvertent extraction of energy from electromagnetic fields, propagated from communication, radar or other transmitting antennas to plant where a potentially flammable atmosphere may be present.