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New R.C.D.s and TT Earthed Installations.

Zoomup

Good morning all on this lovely sunny morning.

I was wondering if we need to notify all of our customers with TT earthed installations of the need to remove any AC type R.C.D.s and replace them with the newer type A, B or F? The renewal will be to ensure correct operation if unknown loads are connected with a D.C. component.

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www.youtube.com/watch

Z.

Parents
  • 0

    Interesting.

    I noticed their test rig seemed to have the d.c. in a galvanically separated circuit - using a spare pole on the 3ph RCCB or the grey wire on the earth leakage trip. Note sure if that makes any significant difference to having it truly injected into the a.c. circuit.

    Since to see some actual figures - even just 50mA d.c. can completely disable a 30mA RCD as far as additional protection is concerned.

      - Andy.

Reply
  • 0

    Interesting.

    I noticed their test rig seemed to have the d.c. in a galvanically separated circuit - using a spare pole on the 3ph RCCB or the grey wire on the earth leakage trip. Note sure if that makes any significant difference to having it truly injected into the a.c. circuit.

    Since to see some actual figures - even just 50mA d.c. can completely disable a 30mA RCD as far as additional protection is concerned.

      - Andy.

Children
  • 0 in reply to AJJewsbury

    You can do similar experiments with single-phase 2-pole RCD, using a 9 V battery and variable resistor plus fixed resistor (or separated, SELV type, variable power supply and fixed resistor) feeding through the neutral. (Do be careful to design your experimental equipment and test arrangement so you are not exposed to contact with the neutral through ... sorry for stating the obvious but you never know who will be reading this.)

    Interestingly enough, generally you see the effects at lower DC current flowing one direction through the RCD to the other direction!

  • 0 in reply to gkenyon

    So, are people on TT earthed camping sites or caravan sites' supplies who may plug in a modest electric vehicle charger at greater danger nowadays?

    Z.

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