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I personally would rather use the DNO earth and “export” it in almost all cases domestically.l (including hot tubs) If there were parts to be bonded I’d just use 10mm or more 3 core swa. In a recent instance a garden room supplier insisted on the provision of a TT/rod and a 100ma time delay...

The foundation of the argument to separate the hot tub or summerhouse from the PME earth is fundamentally around the likelihood of being stood in less clothes /footwear in closer proximity to terra firma and the risk of a lost PEN conductor along with absence of bonded services supply metalwork...

Taking the outbuilding as an example, Most garden rooms sheds garages and the like kind do not have gas or water supplies or other extraneous conductive parts that need bonding. So is it really better to have a PME earth outside of the equipotential zone than have it isolated to within it - I’m...

Well trodden debate in terms of say hot tubs or outbuildings where the origin is a TN-C-S, the general consensus rightly or wrongly is to not “export” the PME to the load side and instead “TT” it. However when the supply is via an SWA cable this raises the issue of the armour/glands becoming an...

You ignited my curiosity so a quick google found this - essentially SRCD not listed in 7671 may have been an error https://communities.theiet.org/discussions/viewtopic/1037/25173

Never heard that before John ? My only Thought is they meant where the cables supplying the socket are concealed in walls less than 50 mil not otherwise protected etc ?

Yes agreed. Anyway back to the original question is there anything wrong with the design which would effectively be a radial socket circuit with a DB at the end feeding a 20A radial and 6A lighting cct in the outbuilding?

Under what circumstances is additional protection of an SWA cable by a 30mA not preferable to ADS ? (Ignoring selectivity as outlined above )

Yes good point because it means less selectivity on the (2) final circuits but that’s acceptable in this case and arguably better to have additional protection on the SWA than just ADS

Hi I need to supply power /DB2 to a shed AKA summer house at 35M from house which is straight forward enough, however the customer also wants a twin s/o in the garden halfway. Rather than bring a cable back from DB2 (or another cable /circuit from DB1) I am considering putting the socket midway...

I wouldnt say the DNO installation methods are anything to be benchmarked by - they are a law unto themselves on domestic metering And service heads With non compliance to bs7671, poor workmanship etc !

I still think it’s a ****e install stuffing 7 1mm wires into the neutral of the main switch and 4 x 2.5 mm into the main earth terminal- it took me some time and care to get the Earth ones back in properly - some may not be as diligent in future which is a biggy in terms of the Earthing. And...

It’s good to be back

You don’t need to do anything about the situation unless you are going to upgrade the CU. If doing an EICR it would/should be C3 because it doesn’t comply and I don’t see it as potentially dangerous, no more so than someone digging up or drilling through the mains incoming to a house Yes you...

Yep he/she was definite marmite material very knowledgeable but I got the impression armchair warrior and had a great ability to really wind people up in fact me included . Anyway trying to upload pic as still this seems wrong

Ps I would halve thought a bit of 16mm T&E Would have been easier to install , terminate and contain than the aforementioned?

Thanks RF I didn’t code it in the end it goes through a place Under a stair well into the apartment no one is ever going to be drilling Or interfering with - was Installed in 2006 by all accounts. Ps. You were posting on this forum at least 15 years ago when I was last on the tools fair play...

Nice photo but whats your point ?

The only split cons I’ve seen before was as you say for a TN DNO suppies not as meter tails , also never seen insulated singles in this format every day a learning day I guess

Yes installation Of this cable a complete bodge some sort of large SWA type gland shroud kind of held on with masking tape. Could tell if SWA or just pvc sheath bit still not sure why would be used for supply from switch fuse to CU ... ?