house wiring?

[ScottBram]

I looked at my wiring today and discovered some really bad things.

There seems to be one 2.5mm wire going to a J/B which has these off it:
Bathroom lights(4x30W LV spots) & sw
Bathroom Extract fan (on with light sw)
Bathroom Shaver point/light (Filament type not fluro)
Bedroom No.3 ceiling fan/light & sw
Double sw for the External security light (at least 250W) & dining room lights (4x 40W spots)
Kitchen Under bench lights (2 old filament tube type) & sw.

How many circuits should I split these to?
Is 2.5mm to each light circuit too big?
Does the bathroom need to be on a seperate circuit?
Can the external light come off another light circuit from inside?

Cheers in advance

[bububaby]

Hi ScottBram. 1st, You're really not allowed nowadays to do your own electrical wireing according to new rules. 2nd Lighting circuits should only ever be on 1.5 cabling. Bathrooms should always be seperate. What size main fuse is there fitted in this JB? Sounds madness + Damned dangerous to me. All should be seperated out using correct rated wireing & Fuses. External Lighting could come off an appropriate internal circuit. But watch your ratings! This is all far too much load on one circuit for certain. GOOD LUCK MATE & Hope this is helpful. SLG

[ScottBram]

Thanks for the reply.
The J/B is a standard 6 terminal 20A white one. Currently there is a 6-way C/U which I'm getting changed to a 12 way split load Wylex unit but I cant remember what the C/B rating for that circuit is.
Dangerous?! Thats not the half of it. There is another security light which comes from one side of a double switch, the other went to a standard extension lead type double plug which feeds the fish pond pump. Yes OUTSIDE, less than a meter from the water and NO RCD!! I've temporarily changed the plug to a sealed box until I can get it rewired. The other laughable thing about this circuit is it goes back to a 13A plug-in socket in the loft, which is itself an add on to another circuit, which I suspect is the one feeding the kitchen overhead lights. BODGING COWBOY comes to mind!! And dont even get me started on the feed to the garage & workshop...

[buildersmate]

You are allowed to do some wiring, but never in the bathroom, kitchen or certain other potentially more dangerous (if wrong circuits) - for example outside the earth plane of the house. Or you make a Building Regs application.
Given the scale of problems you appear to have identified, it would be sensible to ask a qualified electrician for advice