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

Last edit: 07/08/2025

Associated safety device

If a safety device isn’t designed for a specific equipment, it can be assessed independently; safety integrity and other parameters associated to safety, as well as the interface to the Ex equipment shall be specified in the instruction of the Ex equipment itself.

The safety device and the associated equipment is to be considered as Ex Equipment, and it needs to be assessed according to the relative table, shown in the previous page.

As an example, there are motors under the control of a Variable speed drive that need an overtemperature control. That can be achieved with a SIL rated safety electronic device, inside the cotrol panel in the safe area, and a Thermocouple inside the motor and connected to the safety device.

IEC TS 60079-42 – Functional requirements for a safety device

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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