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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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    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? 



    Or another possibility - looking at the pictures in the linked manual - it might be double insulated from the point of view of things outside of the enclosure (the usual point of view when considering electric shock), but not double insulated as far as a copper pipe & metal valve body passing through the middle of the enclosure is concerned - i.e. there might only be the equivalent of single insulation between the PCB and pipe/valve inside the enclosure, the enclosure itself providing the 2nd layer of insulation (when no valve/pipe is present).


      - Andy.
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  • 0

    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? 



    Or another possibility - looking at the pictures in the linked manual - it might be double insulated from the point of view of things outside of the enclosure (the usual point of view when considering electric shock), but not double insulated as far as a copper pipe & metal valve body passing through the middle of the enclosure is concerned - i.e. there might only be the equivalent of single insulation between the PCB and pipe/valve inside the enclosure, the enclosure itself providing the 2nd layer of insulation (when no valve/pipe is present).


      - Andy.
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