Well the only thing that you are doing 'wrong' is not applying diversity.
I am going out for dinner in a short while and cannot spare the time tonight, I will try to reply Saturday with calcs with diversity applied, unless some other kind gent does so in the meantime.
Suffice to say that...
"And there is more chance of hell freezing over than you getting prosecuted for non-compliance with the Building Regulations."
Maybe but so what? Same can be said for speeding, shop lifting, stealing in general and even murder these days as the police are far too busy filing in forms that...
I agree Gary the 'system' is far from perfect.
But the risks of non-disclosure are pretty significant as the OP implies above. Other than obvious signs such as changes in cable colour, different make accessories, date of manufactured accessories, visible disturbance to the building the worst...
Simple test - the oven should be connected via a CCU (a 2P device).
Isolate the cooker/oven using this CCU.
Does the RCD trip? If yes your sparky should ,have red face.
Turn on the CCU. Does the RCD trip? If yes the cooker manufacturer should have a red face.
Sarcasm is the lowest from of wit and he highest form of vulgarity.
Facts remain - it IS the home owner that is prosecuted for work done that does not meet the building regulations. The onus lies with home owners to ensure that trades people follow the rules.
As stated it depends on the cable run length from the CU to the CCU and outlet plate.
Use this to determine the type of cable and its csa -
http://www.tlc-direct.co.uk/Technical/Charts/VoltageDrop.html
"With regards to the load - that was the only light I was attempting to turn on so it can't be overloading." Sorry to disagree but it can be close to or exceeding the load with a single FAULTY light installation.
If its getting hot then clearly something really amiss. I suggest you get a...
"is there anything else I can use to get around this? "
Yes fit a good old florry.
Most modern dimmers no longer need the 2x rule.
It is cheap transformers that 'buzz' to be precise it is the laminations that 'buzz'.
Magic formulae? No such thing as magic only common sense (and money)
'Clicking' sounds at CU's can only be one of two things -
(a) the load is marginal for the MCB rating as in its a 6A MCB and the actual load is close to or over 6A. That is the total load is marginal. Check this by switching on as many lights on the same MCB as possible until its tarts...
The wiring that you describe is completely wrong.
It shoud be S-Plan. There should be 2 x 2 port valves or one 3-port valve, If it has a spring return then it is a 2-port. Something odd there for starters.
It is also most odd that you have no stats at all! Was the system installed by an...