Talk:Trapped-key interlocking

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This page contains outdated sourcing (EN954) which has been replaced by ISO 13849-1 and 2 which in turn have been revised since publication (2009). Reference to ISO 14119 must be made as trapped key systems are part of this standard. Selection of a trapped key system does not start with defining the energy sources, but by Risk-analysis in accordance to ISO12100. STOP categories are missing in the article (STOP 0, STOP 1, STOP 2). The requirement that key exchange devices (or blocks) may not incorporate other functions is incorrect, ISO 14119 explicitly allows for multi functionality. If indeed not allowed, state legal or normative source. A new ISO Technical Specification is under development by Technical Committee TC199 WG7. Reference to manufacturers Kirk Key and Castell is to be regarded as advertisement as both companies are part of the same Halma Group and share their Managing Director. Both companies may merge in the near future, please check Halma website for reference. Other Manufacturers must be mentioned and added to this article to improve impartiality. Trapped key interlocking may also be incorporated with other technologies creating so called hybrid systems. Trapped key interlocking is also used in the process industry, mainly referred to as Valve Interlocking, the article is incomplete.79.239.154.236 (talk) 14:01, 19 December 2016 (UTC)