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Type-A RCD failing 180 degree ramp test

Former Community Member
Former Community Member
Hi


We are testing a type-A RCD (see image: "ABB") with a METREL MI 3152 (see image: "MI 3152 test").

As the image shows, the ramp test (I delta) is failing to trip the RCD for the negative half wave.


Have oneone seen this before?


Br Sebastian
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Parents
  • 0
    yes that is a "ramp test" to the older hands among us.


    If you can please re-test, lying to the meter that it is an AC type, and also verify that all phase to phase voltages are similar.

    how is the meter connected - how are you choosing the phases to test - your diagram may imply live no1 and earth ,

    does it work if you shuffle them  and use say L3 and earth ?


    Is this the only RCD of its type you have tested with this meter, or has another one tested OK?


    What is the NE voltage, and where is the NE bond ?


Reply
  • 0
    yes that is a "ramp test" to the older hands among us.


    If you can please re-test, lying to the meter that it is an AC type, and also verify that all phase to phase voltages are similar.

    how is the meter connected - how are you choosing the phases to test - your diagram may imply live no1 and earth ,

    does it work if you shuffle them  and use say L3 and earth ?


    Is this the only RCD of its type you have tested with this meter, or has another one tested OK?


    What is the NE voltage, and where is the NE bond ?


Children
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