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RCD Testing x5 150mA (or higher for Hager RCCB)

sparkiemike
Following on from John Peckham's recent post, I have recently installed several of Hager's consumer units with their new 100A 30mA Type A RCD (CD285U)


When testing the RCDs I noticed the trip times were much higher than previously experienced. Hager have said that RCCB needs to be tested at 250mA https://www.hager.co.uk/news-exhibitions-case-studies/18th-edition/updated-guidance-rccb-testing/97806.htm


In addition, if you have a Fluke you may notice that when carrying out a earth loop test (in no trip mode) the Fluke will fail to get a reading and trip the RCD. Apparently Hager have had a several reports of this and when I called could not explain it.
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    Sparkingchip:

    It begs the question as to why the manufacturer chose to go for the higher design parameter or did they just turn out that way?


    Andy 




    With regard to RCDs I think Hager's interpretation of  536.4.202, 531.3.3 and 415.1.1 means they are offering consumer units with RCDs that are 100A -  Type A -  30mA (in a two module form factor). Whereas Wylex and MK seem to have taken a different approach with Wylex offering boards with a 80A  - Type A - 30mA and can't see boards from MK with type A. (other manufacturers are available ?)


    I am guessing that there may have been some design limitations to achieve the characteristics Hager wanted (i.e. 100A - Type A - 30mA - two module form factor), which meant that the trip time and trip current are on the thresholds of the BS EN 61008-1.


    It would be interesting to test some other manufacturers RCD (100A - Type A - 30mA - two module form factor) and compare results.

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  • 0

    Sparkingchip:

    It begs the question as to why the manufacturer chose to go for the higher design parameter or did they just turn out that way?


    Andy 




    With regard to RCDs I think Hager's interpretation of  536.4.202, 531.3.3 and 415.1.1 means they are offering consumer units with RCDs that are 100A -  Type A -  30mA (in a two module form factor). Whereas Wylex and MK seem to have taken a different approach with Wylex offering boards with a 80A  - Type A - 30mA and can't see boards from MK with type A. (other manufacturers are available ?)


    I am guessing that there may have been some design limitations to achieve the characteristics Hager wanted (i.e. 100A - Type A - 30mA - two module form factor), which meant that the trip time and trip current are on the thresholds of the BS EN 61008-1.


    It would be interesting to test some other manufacturers RCD (100A - Type A - 30mA - two module form factor) and compare results.

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