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Thanks RF for your replies.

I agree that that the wiring in no different than four sockets on a ring, I was alluding to the size, rating and integrity of the terminals in the switches. It would be obvious during testing if there were an o/c orpoor connections, I was thinking further down the line when they've been...

Thanks RF, I had considered this, but felt may introduce more potential of a break in the ring being as the ring itself having several connections within the grid. However, as you say this means all accessories are on the ring, rather than spurs, so good call. I think my problem is the...

I am installing an 8 gang grid switch in a kitchen, never fitted one before. Its supplied via a 32A RFC in 2.5 T&E. The loads will be Dishwasher, Hob Ign, Ext Fan and Under Cabinet Lights. The design is 4 DP switches below 4 fuse units, (13A for D/W, 3A for rest) First question: Do you bring...

Its a TT supply with 100mA time delay incomer RCD, and ordinary 30mA RCD. The lights and cooker are on on the 100mA RCD side of the board, and the sockets on the 30mA side. I installed the board to replace a rewirable months back. All insulation tests >500M at the time. I got called back as they...

The lights are to follow a garden path which follows the flower border. I thought the flower boder would be better than the lawn for linking the lights together ! The transformers need to be outside, so some form of enclosure is required. In any case, where would you put them in the house ? Also...

44 views and no response, just wondered if anyone might like to comment, excuse my impatience !

For example garden lighting where the supply has been run in SWA clipped to outside wall to an IP65 box. What regulations apply to the (12V)ELV cables from from the transformer to the luminaires Could you run these in say some flexible conduit just below the soil in the flower beds ? Edit...

With the main switch ON, on any TN-S installation, all the neutral conductors are connected to earth. So why would this lead to death or fire ?

Whats the worst that can happen/the danger potential with this type of fault. ? Obviously on an RCD this would trip, but not on a non- rcd circuit - as I'm sure there are plenty of unkown faults of this type supplin gsockets and the like quite "happily"...

Perhaps by enquiry ?

Thanks for the replies. I was told on an NICEIC course that the entry should be the SUPPLY conductor size, i.e. the DNO cable. I'd argue that its not "pretty obvious" as the entry is "Supply Conductor CSA" not "Meter Tail CSA" Interestingly the model forms in 16th/17th editions do not...

Thanks for the reply. But are meter tails "Supply Conductors" ? Surely the "bell wire supply cable" is the "Supply Conductor" ?

Do you enter the size of the meter tails to the CU or the size of the conductors in the supply cable to the property ?

In my opinion, utter nonsense. Nobody has stated or even suggested that diversity is compulsory. The replies have given the OP some options that will comply with the regs. The reason diversity calculations exist is because they have been proven to be correct by mathematical and practical...

10sq mm and 40A breaker would be OK. Make sure your CU can take 40A breakers though, if its an old type CU with a 60A main switch the chances are it cant. Rewirables (e.g wylex) that have had fuses replaced with MCB's are usually only rated for max 30/32A devices.

Which is why I stated that 6.0 cable would be OK. Which is why I stated that if there is a socket to add 5A My apology, by "worst case" I may have been unclear. My intention was to indicate that allowing for diversity, with a socket, the highest value of design current for selecting the...

I personally find the use of a "rolling eyes" smiley rather patronising, especially when you are incorrect with your reply. Diversity allows for 10A per appliance + 30% of the remainder, and 5A if the CCU has a socket. So worst case is around 32A so since 6.0 cable clipped direct can handle...

I have been researching similar scenarios recently and my understanding is as follows: You would need to connect the structural steelwork in building B (if its an E.C.P) with a main bonding conductor back to building A. Not applicable if you do the above. Yes, if you treat building...

Thanks, thats what I was after. The bit that doesnt make sense to me is that the value of I you are using is for (0.1s) an instantaneous operation of the device, not the PFC. Its not uncommon to see a Zs on a radial in 2.5/1/5mm of say 0.3ohms, which would require a CSA of over 2mm using the...