EN ISO 14119: Interlocking device associated with guards

EN ISO 14119: Interlocking device associated with guards

Last edit: 15/05/2023

The EN ISO 14119 standard, published in October 2013, replaces the European standard EN 1088:1995+A2 (July 2008 edition).

This is a technical standard of type B2 regarding a particular protective system against hazard: interlocking devices.

Its purpose is to specify the principles for design and selection of interlocking device and to provide measures to minimize defeat and bypass of the device.

The Standard also provides:

  • Requirements for the design and the installation of interlocking devices with and without guard locking;
  • Additional requirements on guard locking devices if its application creates hazards;
  • Control requirements.

The choice and the correct application of a particular type of interlocking device among the 4 types classified by the Standard depend on the risk assessment for the machine where the device will be applied.

The manufacturers of the interlocks are required to give the marking in accordance with ISO 12100: 2010 and the instructions of the device; for the manufacturers of the machines already provided with interlocking, marking is not required.

An interlocking device consists of several parts, an example is shown in the figure, being:

1 Guard

2 Interlocking Device

3 Actuator

4 Position Switch

5 Actuating System

6 Output System



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