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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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  • Former Community Member
    0 Former Community Member
    The limitation re not allowing mains powering if it is pipe mounted may be more about the 230V terminals being in very close proximity to potentially wet pipework, e.g. condensation, drips from the compression joints etc.  It looks like the top-down cable feed and clamping arrangement could funnel any water towards the terminals.  So a possible safety risk for a lazy plumber who might not have bothered to isolate before working on the valve.
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  • Former Community Member
    0 Former Community Member
    The limitation re not allowing mains powering if it is pipe mounted may be more about the 230V terminals being in very close proximity to potentially wet pipework, e.g. condensation, drips from the compression joints etc.  It looks like the top-down cable feed and clamping arrangement could funnel any water towards the terminals.  So a possible safety risk for a lazy plumber who might not have bothered to isolate before working on the valve.
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