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Use of Type B MRCDR with no Neutral

Lee Colin Ingram

We have Type B MRCDR's installed within our MDU/MDA assemblies. The manufacturer/model is Doepke - ELR-3BN+ residual current transformer.

They have been installed on supplies to VFD controlled equipment so we have followed manufacturers guidance.

My question is this.....The VFD equipment does not require a Neutral therefore only the 3 phases pass through the associated residual current transformer. 

We were able to test the device as both a Type AC and a Type A and the device operates, it does not however operate as type B when this is selected on the MFT.

I may be worried about nothing as they are operational.

Please share your thoughts

Parents

  • The comments about Hager and their 30 mA Type A RCDs partly explains how we ended up with this regulation and the guidance in GN3 I posted above as recommendations for testing RCDs.

    It then begs the questions, why was the Type B test being done and what were the settings on the tester?

  • in reply to Sparkingchip

    There is another question as well, was the VFD running during the test and what was the frequency of the current if it was running?

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