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Splitting hairs I know but the orginal post never said L1 & L2 were off the same supply in the house CU. It said off the same RCD (which could be a the split load CU RCD for example) L2 is switched intended to be used as an isolator. (Isolators DP for single phases?) Its hard to isolated...

Sorry to be a pain but you cannot have a shared neutral across two different circuits. Best option is to run two separate cables as this means there are no junction boxes etc with more than one supply to isolate. Alternative: subject to cable sizing, fault loop imedance, earthing...

Ages ago or so it feels today - I sugested you get the original guy back to check his work. Ignore that advise - GET SOMEONE ELSE! Before you were fiddling with the wires thinking the circuit was isolated when the fuse was actually out for the other shower - you were probably playing with a...

Just to clarify I meant I don't like the orginal idea not Ban's suggestion.

I don't like the sound of this idea. Extension leads into sheds into rcd's into a plug in transformers not good. If the transformer is of the plug in variety (like a mobile phone charger) then it should be in the house with only the ELV side of the circuit exiting outside. I would only...

Hi I'm looking for a decent guide to pipe sizing/calcs for water. Can anyone recomend a book?

Has anyone ever come across a TN-C-S installation where the main earthing connection is to the service main sheath before the cutout. The installation looks like a classic TN-S arrangement and I would have assumed it was TN-S if it had not been for discovering a 15th ed. installation...

Simon, If you keep doing the test sooner or later the result might SHOCK you. Seriously it sounds like there is a wiring problem and the RCD is doing its job. When the sparky's been let us know what it was - we are all as curious as you. BN.

Please don't take this the wrong way but I think it would be best to call in a professional. If you only have one socket per room your wiring could be quite old. You also don't sound familiar with electric's. Please be safe and call an electrican. BN

Hi Grebe, Thanks for the answers - nothing apart from the 2 16A MCB's we discussed before stands out. MCBs trip for two reasons 1) Fault current – short circuit etc – quick bang. 2) Overload – circuit demanding too much power for the protection device can take time to trip fior...

I'd ask the electrician to come back - I'm not 100% sure your foam - however horrible it is could be causing the problem. It may be a cables slipped out of its terminal etc. Pull the fuse and call him back. If you wired it with copper pipe have him continuity test it as well. Finally...

Hi Ryan, I agrre its a odd one, thats why I double checked the wording and came to the same conclusion as Plugwash. I'll double check in the full regs later just to be sure though. BN

Just double checked the exact OSG wording (sect 7.3.2) and I think you are correct and will need to protect the socket cables even though they are on a vertical line with the light switch. Good luck.

Ross if you allow 3kw for the DW & Washer you get 6kw = 26 Amps maximum demand. Applying diversity you could argue 20 amps would be ok but I would go for a 32 amp ring or radial final circuit the extra cable cost is negligible against the risk of the freezer going off.

Hi Mark, I can think of three possible reasons. Apologies if this is stating the obvious but for completeness its worth restating. 1) HEATER Heater’s thermostat is off/too low. Heater is broken or the supply flex is broken / disconnected. The time switch could be running ahead/behind...

Common is connected to either L1 or L2 depending upon the switches position. So in a 1 way circuit you use (either L1 or L2) and the common. Wiring L1 to L2 will never make a circuit. The switch return should alwasy be marked with a red (or brown) sleeve or tape) to indicate its not a...

Entry systems are the bain of many flats - with 14 flats do you have a managing agent? Its really going to be down to them to solve by bringing in a professional installer. It sounds likely you will need a new system - new handsets etc. All you want to hope is that it's does not need new...

Ok, if it’s a DIY type it’s unlikely to be an in rush current problem. Type B MCBs are normal in a house. Few more questions:- 1) What’s the power of the saw? 2) What fuse is in its plug? 3) Does it only trip on a restart – always? 4) Do you run it for long or short periods? 5) Has it...

Each spur off ring final circuits can only supply a single/dual gang socket unless they are supplied from a Fused spur. I'm also a bit confused by Is this a communal area or within a flat? Hopefully all flats are independent? FP200 is a fire resistant cable intended primarily for...

Its possible to use a contactor in a standard DIN consumer unit enclosure. A small timer/programable timer could be used to control the contactor. Look at the MK range for more info. You may also be able to get reconditioned timers - the REC ones usually have back up springs to keep the...