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Double Insulated, yet....

AncientMariner
A few years ago I fitted a Cistermiser in the mens toilets of our village hall. For fitting simplicity I chose the 4 x AA battery option for power, although they do have an inbuilt 240v ac psu.  Today, intending to change the batteries, found that due battery leakage, one of the battery contact strips had corroded away.


Currently my intention is to fashion a new contact strip and thus repair it, but using the inbuilt 240v option also occurred to me.


So why, when this device is double insulated, have the instruction that if pipe minted, then can only be powered by batteries, but if I split the unit and have a cable from the unit to the water valve, I can use either 4 x AA batteries or 240v ac?  As it says on page 10 of https://www.cistermiser.co.uk/wp-content/uploads/2019/01/Infrared-Control-Valve-IRC%C2%AE-Installation-Guide.pdf  in Section 5.Power  "Do not mount a valve with Mains power directly onto pipework." "When fitted directly onto pipework, only use Battery power."


Seems strange.


Clive






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    Oddly we have a similar model at the scout HQ, though supposedly battery only,  and the batteries had failed, and I added an external PSU.

    I suspect the issue here is one of EMC or other CE  approval, the devices having not been tested and approved for use in all possible configurations.

    In leaded mode, is there a ferrite bead on the wire by chance ?


    In practice it may not quite meet the specs, but as a one off, is most unlikely to be dangerous.
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  • 0
    Oddly we have a similar model at the scout HQ, though supposedly battery only,  and the batteries had failed, and I added an external PSU.

    I suspect the issue here is one of EMC or other CE  approval, the devices having not been tested and approved for use in all possible configurations.

    In leaded mode, is there a ferrite bead on the wire by chance ?


    In practice it may not quite meet the specs, but as a one off, is most unlikely to be dangerous.
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