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Table 54.7 is to calculate/select the cross sectional area of every protective conductor, other than a protective bonding conductor. Regulation 544.1.1 states the minimum CSA of bonding conductors except where PME conditions apply. Where PME conditions supply the CSA should be selected using...

I only have the 16th edition GN8 but page 41-42 are worth reading for whoever doesn't understand the bit about equivalent conductance. 

Table B2 disagrees with what?

Yes there is nothing wrong with using the armour as the CPC if its of an adequate size. There is nothing wrong with using the armour as a bonding conductor if its of an adequate size to offer equivilant conductance. The armour of a 16mm 2 core SWA is adequate as a CPC but not as a bonding...

I've had the argument loads of times about using the armour as combined CPC and bonding conductor.....Its clearly stated within the regs that it has to offer equivalent conductance of copper if other metals are used i.e the steel armour when used as a bonding conductor. 16mm 2 core hasn't got a...

Doesn't that still require a cable between the contact on the thermostat and boiler though?

Nest... but you would have to use the supplied power lead and adaptor. Could you install it backing on to a cupboard somewhere and plug it in within the cupboard? Most wireless thermostats have a low battery indicator and don't just go dead over night...and as said above last at least a couple...

yeah I meant installing a cable between shower isolator and relay. Then cable from boiler/wiring centre to relay so the boiler control signal can be taken through the normally closed contact. Getting the cables in position might not be an option.

It would be handy if you could install a relay so the shower wont work if the 12KW boiler is pulling FLC but probably wont be a viable option.

The reading would indicate a circuit length of around 43 meters if 1mm T&E has been used...

There is nothing wrong with going above and beyond the bare minimum....

how many bathrooms you got?

yes I had but gave up on the thread ages ago :Salute

Have a look at first utility. I bet your be able to get dual fuel fixed for a year for around £60-£70 per month. That's what I'm paying...3 kids and 4 bed house.

Isn't a PRV a pressure relief valve not a pressure reducing valve which is what the one in the pic is? 

maybe its something like the lay-z-spa that's just a plug in jobbie?

http://www.surewire.co.uk/ I can understand using the method for top floor lighting but not ground floor lighting if your intention is to hide the JB under the floor even if the connectors are MF. If I was to use the method on the ground floor then I would hide the JB in a storage cupboard or...

Not sure but glad I haven't been fitting this gear though.

http://www.rcboexchange.co.uk/