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One example where it would not be suitable is Reference method 103; in a stud wall with thermal insulation with cable not touching the inner wall surface (42.5 A). The cable should not be more than 97 m long.

Please perform the following tests and answer the questions: 1. turn off all MCBs 1a are the main sockets live? 1b are the kitchen sockets live? 2. turn on just the 2nd MCB from the right 2a are the main sockets live? 2b are the kitchen sockets live? 3. turn off the 2nd MCB from the right...

Professional electricians get to see lots of wiring mistakes. Maybe they truly believe most of these are caused by amateurs. ;-)

If you believe that the MCB ever failed to isolate its circuit, you should get it replaced.

Thanks for correcting my rough estimates. The point is, we both agree that output will be reduced with flow temperature and flow rate (as ΔT increases). I used 11°C (20°F) and 20°C as they are often stated as target ΔT values for radiator balancing. While radiator output is slightly...

What happens when you turn of both the kitchen and house sockets MCBs?

If turning one MCB on with all the others turned off activates the sockets but turning the same MCB off with all the others turned on does not isolate it, it might be you have the two rings crossed. Check which sockets each of the rings MCB (2nd and 3rd MCBs from right) turns on with all the...

The main difficulty will be bending the cable to fit into the sockets. You'll need 35 mm deep boxes rather than 25 mm. You can extend the circuit with 4 mm² cable clipped direct on the surface or buried in plaster but not anywhere else. If you bring the 6 mm² cable into one socket (single or...

I think all work in a CU is notifiable. But don't worry, what you have is ideal for a 32 A radial circuit which can feed an unlimited number of sockets for up to 75 m² floor area.

Don't forget your vapour barrier.

The design flow rate for your radiators will typically be for an 11°C drop from 75°C to 64°C (non-condensing), averaging about 50°C above room temperature (some of your old radiators may be designed for 85°C flow): 30 kW ÷ 11 °C ÷ 4.1 kJ/litre/°C × 60 s/min = 40 litre/min If you are...

Do you have a shower pump?

If the pop-up waste is under a shower, it is very easy to tread on it and bend the arm. If you fix it, give clear instructions that it must not be stood on. My personal preference is for a simple plug and chain (pulling hair plugs out of pop-up wastes is not my favourite chore).

A typical conservatory supplies daylight to the room it is attached to, fitting opaque insulation might make the house dark. Noise is also likely to be a problem, I hope your neighbours are 100% behind your burgeoning rock career. Rock on.

I'm not sure if he has allowed sufficient space for the A/C kit and ducts to cool the cabinet. Oh, don't forget the noise insulation to limit the noise from all the fans. ;-)

Doesn't sound like it would be an issue with a 4-pipe boiler with internal diverter valve using W-plan.

I wonder if the short-cycling might be influenced by radiator flow? If the radiator flow is much less than the boiler flow, the by-pass will open and the boiler will heat up very quickly. In the interest of being bloody nosey ;-), what happens if you open all the TRVs?

You don't want any vented voids between the Kingspan and new plasterboard. I think it would be better to have the Kingspan level with the bottom of the joists. If that is a pain, insulation clips might help. Better still would be to pack the void above the PIR (Kingspan) with mineral wool...

I don't see a huge difference between the complexity of a low loss header and a plate heat exchanger. Both require a boiler pump and a separate CH pump. With a 4-pipe boiler like the Veissmann (with internal diverter valve), would the DHW circuit typically be on the boiler side of the CH plate...

But the quotes you gave said "every" and not "each". I thought that with a TT system, you just needed the extra 100 mA RCD double-pole isolator to protect every circuit from major earth leakage because the earth rod cannot take the required fault current. The 30 mA RCD requirement still applies...