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    UK central heating plumbing and control questions.

    UK bungalow built about1975. Central heating installed professionally when the previous owner had it built. Query is re hot water cylinder heated by oil fired central heating boiler and with immersion heater and separate thermostat. I have never really got to grips with how the system is...
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    RF from amateur radio triggering squawks from outside alarm sounder

    Otherwise 100% (if elderly) Optima XM6 panel with good battery, and Pyronix "Belle" outside sounder, alo with a good back up battery. I am a radio ham and when I transmit on 136kHz (yes, kHz LF) it will make the outside sounder squawk very briefly and intermittently every few minutes. The two...
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    Armoured mains cable sizing question

    I need to run mains single phase power to some new land we have bought, a distance of about 150 metres from my workshop with a decent mains power feed into it. I want to use 3 core armoured and bury it. I need to run a normal 13 amp socket at the field end. What size cable do I need, and is it...
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