IEC TS 60079-42 - Ignition prevention by safety device - 2

Last edit: 07/08/2025

Safety characteristics of a safety device

A safety device shall provide a level of safety, or better speaking, a safety integrity, suitable for the required ignition risk reduction for the Ex equipment, by previding a minimum risk reduction factor according to Table 1.

By applying addictional safety precautions in the event of an ignition the RRF (factor by which the probability of the occurrence of an ignition source in the EEUC is reduced by the safety device) shown in the table above may be reduced.

If that is the case, the RRF need to be verified.

IEC TS 60079-42 – lgnition prevention by safety devices – 3

Index

IEC TS 60079-42 IEC TS 60079-42 – Basic Requirements IEC TS 60079-42 – Ignition prevention by safety devices IEC TS 60079-42 – Ignition prevention by safety device – 2 IEC TS 60079-42 – lgnition prevention by safety devices – 3 IEC TS 60079-42 – Functional requirements for a safety device IEC TS 60079-42 – Testing and verification

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