Guard interlock standard EN ISO 14119 has now superseded EN 1088

30 April 2015

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Guard interlock standard EN ISO 14119 has now superseded EN 1088EN ISO 14119:2013 Safety of machinery - Interlocking devices associated with guards - Principles for design and selection has superseded and replaced EN 1088 as of 30 April 2015.

In contrast to EN 1088, its replacement, EN ISO 14119, considers additional technologies such as RFID or electromagnetic guard locking, classifies interlocking devices and stipulates more clearly the specifications for installing guards. These stipulations are particularly significant with regard to protection against guard manipulation, also known as defeating of guards.

EN ISO 14119 (BS EN ISO 14119 in the UK) replaces all national standards on this subject - including BS EN 1088 - and will be valid worldwide. This signifies a huge step forwards: the old standard was purely European, whereas the new International Standard is published by ISO.

Switch classifications

All safety switches and safety gate systems have been classified into four types for this purpose. The standard considers the operating principles of the switches, such as RFID or electromagnetic, and coded safety switches are subdivided into different coding levels. The standard provides specifications with regard to the proper installation of the interlocking device. Each safety gate must be checked for ways in which it can be manipulated. The necessary static and dynamic forces (minimum holding forces) are also examined.

Specifications regarding the series connection of safety switches and safety gate systems are new, addressing the long-known subject of fault masking. EN ISO 14119:2013 provides machine builders and users with much wider scope to use a broader range of technologies when interlocking guards; it also places more responsibility on the designer to prevent foreseeable, deliberate bypassing of guards, and it will change the way in which guard interlocking devices are connected across machines.

With its safety switches and safety gate systems, Pilz meets the specifications of the new standard and supports design engineers who develop standard-compliant, future-proof guards.

Follow the links to read a detailed technical article about the differences between EN ISO 14119 and EN 1088 and to find out more about Pilz guard interlocks.

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