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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?

  • 0

    You are missing a “R” in the catalogue number. Should be ARR932U for the rcbo feature. £198 a pop according to Hager website prices, small wonder they are slow to catch on. 

  • 0

    That explains why there is a wholesaler selling them on eBay for £35 including P+P.

  • 0

    If the contractor installed them, and intimated they were RCBO's, then what did their verification paperwork say and indicate on their protection device test results?

    I presume if they have recorded disconnection/trip times on their paperwork then those results were "False"?

    Cheeers GTB 

  • 0 in reply to GTB

    they did provide an EIC at my request ,this had the trip time as 11mS .

    i can only think these must be fabricated results.

  • 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.

  • 0 in reply to Newfutile

    ahhhhh. This is the true effect of demanding paperwork from installers instead of someone else inspecting. In the old days we knew it had not been tested. Now we are far less sure.

    (a comment to be read with a slightly cynical grin)

    Mike.

  • 0

    From the horse's mouth:

    https://hager.com/uk/products/h/arm932u-mcb-with-arc-detect-1m-32a-b-6ka

    https://hager.com/uk/products/h/arr932u-rcbo-with-arc-detect-1m-32a-b-6ka-a-30ma

  • 0 in reply to Chris Pearson

    Both of those links bring up the same thing,  we have now asked the contractor to install the ARR versions.

    i do wonder how many of these have been fitted thinking they have an (RCD) rcbo element,though of course proper testing would find this.

  • 0 in reply to Newfutile

    Both of those links bring up the same thing,

    Same for me - try this: hager.com/.../arr932u-rcbo-with-arc-detect-1m-32a-b-6ka-a-30ma

       - Andy.

  • 0 in reply to Newfutile

    So to me that would be classed as an untruth and improper and false deleration, which has been signed by a so called "Competent" person and making an untrue decleration.

    GTB

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