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Its a Vaillant, system boiler, But I was just going to connect into the wiring centre. No need to go into the boiler It should be straight forward, adding another zone. But I don't get the diagram.

Been left this to wire up by the plumber Im OK with wiring heating systems (Generally), but this has got me a bit confused Its a UFH manifold with a two port valve and pump, that need to be added to an s plan I have attached the wiring diagram Pg2 I presume that I take the grey and orange...

The cost in CO2 from the beginning to end, I would think would be very difficult, to calculate. Just ball parks Im after really. Client wants to stop using gas, and move over to electric. But as pointed out electric is increasingly made from burning gas. So an example. The client wants to...

Just looking at the C02 emissions per kWh of electricity and gas. Figure from the web tell me that Gas produces 0.185 kg of CO2 per kWh Electricity 0.309kg of CO2 per kWh Does anyone know if they are correct, as it suggests that using electricity over gas produces more CO2 Reason I ask is...

Could some one please explain whats happening here. Its the Pyronix V10. Im trying to understand alarm wiring. Im don't understanding the circuit, the two resistors share a common connection How does the loop work. I hope that makes some sense Thanks

Small job installing track lighting in a 1940s block of flats, with concrete ceilings. Bit concerned about drilling into the concrete ceiling, and hitting something. Some pretty good adhesives around now, so, considering gluing the track up, or possibly VHB tape (Which Ive only just found out...

But do you get RCD's with such a high trip current. In 7671, 300mA seems the highest. Im sure in the industrial / specialist world all manor and scale of things happen.

Maximum I delta n 20A for a 2.5 ohm (RA) A 20 A trip current for an RCD, or have I misunderstood. Thanks

Thanks EFLImpudence, for taking the time to explain

I get a bit confused about touch voltage calculations. As this ramble will show. Especially when it involves supplementary bonding. So the resistance between exposed conductive parts and Extraneous conductive parts has to fulfil this formula RA x Ia < 50 v So in a bathroom. Ia is the...

Thanks very much Flameport, great stuff.

Thanks Flameport. I completely agree with your assessment. I wonder though how you would code it on a EICR. Only a C1 or C2 will possibly cause some reaction from a management company, a C3, well , i bet thats put away in a folder. The asbestos thing, will cause some doubt. But electrically...

Thanks for the replies, really appreciated. I won't be pulling anything. On the subject of this type of distribution board. I would like to know more about its function in the supply chain, and who is responsible for it. Is it normal for the Ryefield type board to have no isolation? (That is...

No i don't think there is an isolator to the LLS But the trunking is rammed, so really difficult to follow cables Most of the isolation for the supplies to the flats contains ceramic fuses The LLS contains ceramic fuses. There is no three phase isolation for the MEM board When you say rather...

it opens without a tool, big thumb screws. had a quick look in, closed it. just wondering about what to do. speaking with the client tomorrow. the LLS i want to change probably has the same asbestos pads.

Inside the board The trunking above is packed, really difficult to follow the tails, though it is labelled on the door, but how correct that is 5th fuse on yellow no labels

Not sure yet Cu is tight up to metal trunking, there is a meter above, but, they are quite a few. I need to follow the tails to see what goes where, have a look inside the trunking

Landlords CU needs changing. I normally get an isolator fitted if I change a CU. It looks like the CU is powered from the Ryefield.

Generally who owns these. Its after the main cut out so I doubt the DNO are interested. I guess it depend on if it before or after the meter. What would be the consensus on pulling fuse from a Ryefield You would need to be able to identify the correct fuse to pull, but is this still...

I was testing a ground floor property, in a Victorian four storey house with self contained 2/3 bedroom flats. Single stair case Ceilings are wood joist with plasterboard. Inside the ceiling void is insulation supported by chicken wire. Down lights are installed through out the property...