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It is touch and go and as I say, the Wiska box I used had a 'raised' part in the moulding that prevented the nut getting a decent start on the gland threads. I cut it off flush with the actual wall of the box with a Bosch Multi Cutter and that was enough to get the nut on securely. It did take a...

You're right of course!

Yes PME - what might cause problems? The gland at the Wiska box was indeed on the short side due to a raised moulding on the inside. I cut this out to get the thickness down to the rest of the box and used the optional Wiska plate with spade terminal and flylead. That got a good secure grip and...

No - well aware of issues with installation and verifying TT but as I say it would still leave me a bit uneasy about ongoing reliability (short of re-testing every few months!) and with there being no services or extraneous conductive parts at the moment I'm happy enough to export the earth. As...

Yes - absolutely. So I was sizing cable on the assumption that at some point in the future the armour would be the CPC and the third core MPB. At the moment the armour and third core are working in tandem as CPC (belt and braces!) Have I boobed there? Oh just an irrational notion that ground...

Agreed - but I probably wouldn't trust it! That's just me though! 

Sorry - I meant the steel armour of SWA is lower rated than one of the copper cores so wouldn't necessarily cope with an extreme fault current if used as a bonding CPC and less than 10mm. At this stage the SWA has been laid and terminates (with appropriate glands) at a Wiska JB on the outside...

i am aware the CPC in the T&E would be inadequate for bonding so if bonding became necessary later by added services the plan would be to run an additional single core 10mm CPC in the 'house section' to ensure the bonding is consistent throughout. Although the SWA armour is of lower rating...

That's reassuring - thanks. I was reckoning that I'd be safe enough with 10mm over that distance and considering the short time a shower is actually in use. The feed to the shed is of course hugely over-specced but I wanted to have a decent sized third conductor that would allow for bonding if...

I'm in the process of doing a bathroom update and this necessitates running new water pipes along behind a plasterboard wall in the hallway then beneath the (concrete) hallway floor. Total distance is around 8 metres with 7 behind an uninsulated plasterboard wall and 1 metre under concrete. I...