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Elaine Vermeulen
Elaine Vermeulen

Clc Tr 50427 Pdf Download

CLC TR 50427 PDF Download

CLC TR 50427 is a technical report that provides guidance on how to assess the risk of inadvertent ignition of flammable atmospheres by radio-frequency radiation. Radio-frequency radiation is emitted by various sources, such as radio, television, and radar transmitters, and can induce electric currents and voltages in conducting structures, such as pipes, tanks, and wires. These currents and voltages can cause sparks that may ignite explosive mixtures of gases, vapours, or dusts in the air.

The report was prepared by the Technical Committee CENELEC TC 31, Electrical apparatus for explosive atmospheres - General requirements, and was approved by CENELEC as CLC/TR 50427 on 2004-08-28. CENELEC is the European Committee for Electrotechnical Standardization, which is responsible for developing and publishing standards in the field of electrotechnology.

Clc Tr 50427 Pdf Download

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The report covers the following topics:

  • The basic principles of electromagnetic fields and waves, and how they interact with conducting structures.

  • The types of structures that are vulnerable to radio-frequency radiation, such as loop-type structures (e.g. coils, rings, loops), vertical structures (e.g. masts, poles, towers), and spark-making mechanisms (e.g. switches, relays, contacts).

  • The characteristics of flammable atmospheres, such as the lower and upper flammability limits, the minimum ignition energy, and the ignition delay time.

  • The criteria for ignition by radio-frequency discharges, such as the spark energy, the spark duration, and the spark frequency.

  • The practical measurements and tests that can be performed to determine the electromagnetic fields and the induced currents and voltages in structures.

  • The methods for calculating the risk of ignition by radio-frequency radiation, such as the probability of occurrence of a spark, the probability of presence of a flammable atmosphere, and the probability of ignition given a spark.

  • The measures that can be taken to reduce or eliminate the risk of ignition by radio-frequency radiation, such as shielding, grounding, bonding, filtering, and limiting the transmitter power.

The report is intended to be used as a guide for engineers, designers, manufacturers, installers, operators, and inspectors of electrical apparatus for explosive atmospheres. It is not a mandatory standard, but rather a source of information and recommendations. It does not replace or supersede any existing regulations or standards that may apply to specific situations or industries.

If you are interested in learning more about CLC TR 50427 or downloading a PDF copy of it, you can visit the following sources:

  • [CENELEC -]

  • [Protection against inadvertent ignition of explosive atmospheres by radio-frequency radiation - HSE]

  • [PD CLC/TR 50427 - Assessment of inadvertent ignition of flammable atmospheres by radio-frequency radiation - Guide]


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