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Well do whatever you think is best mate, just giving my experience and advice take it or leave it

No didn’t clamp the rail it’s got a rubberised base seemed to stay put. I just got a thick piece of ply and set the depth to very slightly over the tile depth and just cut the tiles on the floor on the ply.

I did my bathroom tiles which were huge 1200x600. I bought the festool above and a guide second hand was like new for about £300 iirc. with the intention of selling it. Brilliant tool which cuts dry so you can cut indoors if you like . Dust extraction (I hooked it up to an upright Dyson worked a...

I take your point however bs7671 does not define product standards for equipment and equipment does not have to comply with bs7671. In terms of EV equipment there is a BS 62916 which if compliant with then the onus is on the manufacturer not the installer to deem compliance of the components or...

Actually John I think your first paragraph is incorrect. The wording (regs) is “Except where provided by the EV charging equipment protection against DC fault currents shall be provided by ……compliance references to BS62955 for the RDC-DD, , BSEN 61008-1 etc for RCD Therefore provided the...

Good point thanks. I often tie myself in knots trying to design an installation that is safe and compliant, is cost effective/pragmatic for the customer and most aesthetic/least disruptive etc. the reality it’s not my problem. In this case I was trying to use a split load garage sub board fed...

If an EV charge point has sufficient RDC-DD integral RCD protection, my understanding is that this can be supplied from a non RCD circuit provided the installation method is deemed appropriate, e.g SWA. The regulation (722.531.2.101) requiring every charging point to be double pole RCD...

Thinking about this further, the luminaires are wired in flex (L,N,CPC) The same metal frame work is used to support the flex. So in the event of damage to the cable it is possible the framework could become live (in much the same way as tray work) - so now becomes an exposed conductive part -...

Thanks for reply. Correct - not in contact with the ground. Please expand - on what basis would it be better to not have the earthed casing of class 1 fittings connected to it ?

The roof supports/frame of a plastic keter style shed are not earthed/and not in contact to the ground and not part of the electrical installation. Therefore not an extraneous conductive part. However if fitting luminaires, of which the casing is metal/conductive and earthed directly to this...

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...