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Type B rcd availability

Baldyhugh

Hi

would anyone know of a supplier where I could get my hands on a 100A 100ma type B double pole rcd? I need one to supply three variable speed inverters. I’ve done the usual google searches but can only find 30ma ones and only rated up to 63A. 
 

Thanks in advance

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    You need to understand that a motor winding fault does not produce a DC fault of any kind, this requires a short from an internal point in the circuit to Earth. The drive senses all kinds of output faults and shuts off the power to the load, so you are looking at a very unlikely fault indeed to need a type B, and at 100mA  it cannot be for shock protection. Figure A53.1 shows a number of possible faults, but none of these are in any way connected to the load. 

    What about earth faults within the inverter itself? Granted I'd sort of expect ‘disconnection by exploding electronic component' if the fault was downstream of any kind of rectifier but perhaps that's not quite by the book.

       - Andy. 

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  • 0

    You need to understand that a motor winding fault does not produce a DC fault of any kind, this requires a short from an internal point in the circuit to Earth. The drive senses all kinds of output faults and shuts off the power to the load, so you are looking at a very unlikely fault indeed to need a type B, and at 100mA  it cannot be for shock protection. Figure A53.1 shows a number of possible faults, but none of these are in any way connected to the load. 

    What about earth faults within the inverter itself? Granted I'd sort of expect ‘disconnection by exploding electronic component' if the fault was downstream of any kind of rectifier but perhaps that's not quite by the book.

       - Andy. 

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