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    To screw or not to screw…

    I lifted two runs of our creaky 1950s upstairs hall floorboards, which aren’t in great condition and had obviously been up before, to run in a cable. There is a sheet of 3mm hardboard between the boards and the underlay across the whole hall. They have now been temporarily replaced with the...
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    Joining ring main in wall behind kitchen cupboards

    Double-checked and there is only one dead cable cut off. OK, should have taken the tape off earlier… The two cables going into the wall on the left of the choc block drop down from upstairs. The two on the right feed one double socket below the cavity. Do the cables feeding that socket need...
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    Joining ring main in wall behind kitchen cupboards

    It's a solid wall. In the cavity is, from left to right: 1) a cut-off dead cable from an old water heater switch which was behind a cupboard and which we have never used. It won't pull out so I'm planning to cut that off to where it enters the cavity and remove the switch and plaster over the...
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    Joining ring main in wall behind kitchen cupboards

    I removed our old kitchen cupboards yesterday and found the ring main has been joined using two choc blocks covered in insulating tape in an open cavity in the plaster behind one of the cupboards. What is the correct way to join those cables please? And can it be plastered / covered over or...
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    New Electric Oven Wiring

    Thanks for that Harry. Makes life a bit easier. Just got to work out how to lift the laminated wooden flooring in the one bedroom now without damaging it to access the hole bringing the cables up from the garage!
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    New Electric Oven Wiring

    Hi, We really need to fit an electric oven to replace our old gas oven but have no 'big' wiring into the kitchen, just a ring main and lights. I have just checked and the house has a 100A main fuse, 100A meter and a distribution board with 100A main switch with MCBs of 20,6,6,6 unprotected and...
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    Irregular tapping sound in one rad

    Turned out to be s simple fix really...! I tried closing and opening both valves a few times and it has stopped. The noise sounded like it was coming from about 1/3 along the rad so not sure what it was and why it has stopped. In fact the whole system seems to be running quieter :) !
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    Irregular tapping sound in one rad

    The rad has the original simple lockshield (?) valves but thanks for the suggestion. The pipes under the floor do clonk a bit as the system warms up but that stops once it’s hot. This noise is continuous from cold all through the day. Only closing the valves or stopping the pump stops the...
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    Irregular tapping sound in one rad

    Hi, We have an 8' rad in one bedroom which has started to make a loud, irregular metallic tapping sound only when the pump is running. I have isolated the rad and it stops, and have held the rad against the wall mounts with no change. The tapping varies between twice a second to every couple of...
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    Wireless Mains Switch on CH Timer

    Quick update. Cheap (Amazon) Sonoff WiFi switch in and working well on the CH. Thanks for your advice stem. As you said, pin 2 was vacant. Second switch is now working the external Xmas lights, so we can switch 'em on when it's getting dark and we're out! That will be moved to the porch light...
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    Wireless Mains Switch on CH Timer

    Ah, yes... Thanks. I was reading the LP522 switch/relay contacts diagram as though they were external. So connect the WiFi switch input to the timer live / neutral for its power and the switch live output to CH NO to control the boiler/pump/valve. Can I confirm having live still connected...
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    Wireless Mains Switch on CH Timer

    Hi, I recently bought a couple of WiFi mains switch boxes which just connect live and neutral from the input across to output when operated. One will be used to control our porch light and I would like to control the house CH with the other one, if that's possible. A bit of a Hive-on-the-cheap...
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    Plugging an RCD into a cct already protected by an RCD/RCBO

    Well, as stated, I am not a mains electrical person and I can assure anyone concerned with the username that I have absolutely no intention of answering any technical questions in this forum ! Coming from the radio transmission engineering business I do understand most of the interesting...
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    Plugging an RCD into a cct already protected by an RCD/RCBO

    Thanks for all the excellent info gents. I wasn't sure how the leakage current was detected and wondered if the two devices might somehow share it. Most helpful and much appreciated. Sparky54
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    Plugging an RCD into a cct already protected by an RCD/RCBO

    Pardon my lack of electrical knowledge and ignore the Sparky user name :? but I was wondering if an RCD plugged into a ring main powered via an RCBO would not be as effective due to them sharing the trip current, or will the most sensitive of the pair still trip first at ~30mA ?
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