Was it also mandatory to lock pluggable electrical connections in the past? Did other standards apply then?

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Was it also mandatory to lock pluggable electrical connections in the past? Did other standards apply then?

Answer: Even in the past, it was mandatory to lock pluggable electrical connections. Isolectra advises always locking every pluggable electrical connection and retrofitting this lock if it appears that connections have not been secured.

Rationale: 

  • The locks have been available since the introduction of the GST18 system.
  • Wieland has been recommending locking for decades in its documentation.
  • NEN1010:2005 had rules similar to NEN1010:2020 134.1.1 regarding following manufacturers’ instructions and 134.1.4 regarding ensuring reliable contact.
  • NEN-EN-IEC 61535: 2009 had the same requirements as NEN-EN-IEC 61535: 2020. Prior to that, NEN 1535 applied.
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