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Arc Fault Detection Device without rcd

Newfutile

one of our contractors has installed several Hagar ARM932U Arc Fault Detection Device.

After many enquires Hagar Technical confirm its only a MCB with AFDD.

The contractors insist its an rcbo as well , i put 550mA on an (RCD) Residual Current Device test  it did not trip.

this had made me wonder if others have come across such devices and where they are designed to be installed to?

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    and where they are designed to be installed to?

    There are maybe a few situations where arc fault protection might be useful but an in-built (presumably 30mA A-type) RCD might be inappropriate - maybe another type of RCD (e.g. B, S or F) is needed so more easily provided by a separate device, or maybe large protective conductor currents mean that an RCD isn't wanted at all but some form of extra fire protection would be useful (perhaps some industrial processes especially in area with flammable dust etc).

       - Andy.

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  • 0

    and where they are designed to be installed to?

    There are maybe a few situations where arc fault protection might be useful but an in-built (presumably 30mA A-type) RCD might be inappropriate - maybe another type of RCD (e.g. B, S or F) is needed so more easily provided by a separate device, or maybe large protective conductor currents mean that an RCD isn't wanted at all but some form of extra fire protection would be useful (perhaps some industrial processes especially in area with flammable dust etc).

       - Andy.

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