May a flexible conductor without a ferrule be connected to a GST or RST connector?

Answer:  For the spring-clamp connectors, a flexible conductor must be ultrasonically compacted or equipped with a ferrule. For the screw connectors, a flexible conductor may also be used without a ferrule. The screw is a special type that will not damage the shielding in the flexible conductor. Please ensure that all the shielding of the flexible conductor is inserted into the plug. The fitter may be held responsible for any damage resulting from the mixed use of different brands of connectors.

  • See also ‘ISO standard information for pluggable electrical installation’.
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  1. › May a flexible conductor without a ferrule be connected to a GST or RST connector?
  2. Can a blue wire be used for anything other than Neutral?

    Answer:  Yes, this is allowed if there is no Neutral in the cable and there is no risk of confusion.

    Rationale:​ NEN1010:2020 514.3 Identification of conductors, 514.3.6 The use of a blue conductor for certain applications: “For certain applications, provided that the risk of confusion is eliminated and in the absence of a neutral conductor, a blue conductor may be used as a phase conductor or for any other application except as a protective conductor.”

  3. May a green/yellow wire be used for anything other than grounding?

    Answer:  No, that is not allowed. The green/yellow conductor may only be used as a protective conductor.

    Rationale: NEN1010:2020 514.3.1.2 Protective conductors: Protective conductors shall be marked with the colour combination green/yellow and this colour combination may not be used for any other purpose.

  4. May a conductor be marked with a colour at its end?

    Answer:

    • This is not allowed with 2- to 5-core cables, as the cores must be coloured over the entire length.
    • This is a MUST for cables with more than 5 cores, where the cores are marked with numbers and which are used as a neutral (marked in blue) or protective conductor (marked in green and yellow).

    Rationale:

    • NEN1010:2020 514.3.1.1 Neutral or middle conductors shall be marked blue along their entire length.
    • NEN1010:2020 514.3.4 The designation of cores in cables with 2 to 5 cores shall comply with Annex 51.C. The phase conductors must be marked brown, black or grey over their entire length, the neutral conductor blue and the protective conductor yellow/green .............
    • NEN1010:2020 514.3.4 .............. For cables and cords with more than 5 conductors, each conductor shall be marked with colours or numbers as per NEN-EN-IEC 60445. Conductors marked with numbers and used as protective conductors or neutral conductors must be marked at each end with green-yellow or blue, respectively ..............
  5. May a solid conductor be connected to a GST or RST connector?

    Answer:  Yes, the GST18 and RST20 screw connectors and spring-clamp connectors are suitable for mounting on solid cable. This is used, for example, to transition a conventional installation cable from the meter box to a pluggable electrical distribution point in the form of a GST18 splitter block. For the correct stripping lengths and minimum/maximum diameters, always check the data sheet or instructions for the relevant connector. When mounting on a solid cable, it is even more important to ensure that no mechanical forces act on the pluggable electrical connection.

    Questio: May a solid conductor be connected to a GST or RST connector?

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