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Another possibility which you seem to have completeley ignored Mr Sheds is that you do not know the lamps have actually blown. With the cores of the 12v side exposed like that a short circuit is entirely possible which may happen when the transformer heats up thus causing the internal cutout...

As you said it is installed in the same conduit, is their an induced voltage or current in the RCBO protected circuit from the lighting cct as it only happens when the lighting circuit is turned on ?????

I think the fire extinguisher option only comes with the new boards , the older ones just had a fire blanket LoL :D

Where the hell was that site ???? It has broken so many H+S rules its no longer funny . I take it you have had no part in it and have advised the Site foreman of your concerns. The worrying thing is that by the look of the pictures its a decent building judging by the fire alarm cables...

Also note that mixing two different types of the same MCB in the 1st floor DB is not a good idea. Electrium (the company that owns crabtree ,wylex volex marbo etc) have recently changed the design of their fuseboards and the breakers . The new type as in your main DB and the other type as in...

They are M3 for the grid plate on mk ,yet on crabtree they are M3.5 Nick

It sounds to me like you definitely have a loose connection in your fusebox/consumer unit. Sadly this will also have a bearing on your faulty sky box, BT and fluval as they are all losing power and then seeing it again it is causing problems with them . You need to get your Sparky or a sparky...

Old MK cooker switches have 2BA threads and so the nearest metric equivalent is an M5, but yu need to tap the hole sout first . They are definitely not M3.5 Nick

Any updates on what SP have found out yet ??? Just curious as im sure you are to see what there explanation is for the current. Nick

If this is an office environment there is a fair chance the walls are plasterboard in which case just drill a hole in the back of the power compartment and run a flexible conduit upto the spur unit. Nick

sounds like the modern equivalent of asbestos boards to me, firelux, which contains no asbestos. I suggest that if your worried about it you get a sample tested to put your mind at rest . If you want to stop it from spreading fibres for now, just paint over the damage with neat PVA glue Nick

Perhaps you could draw a picture of that abortion of a job your proposing to the OP Holslaw, and then we can riducule you some more :D :D :D

I dont think RF was referring to the chamber being upside down, more the wording on the label 'busbar supports must not be used for the termination of cables ' which they clearly have been !!! Nick

Do what you want, by the sounds of your comments and attitude to the recommendations you will do anyways so as the saying says Go Ahead punk make my day :mrgreen:

Intermeddiate dimmer switches ARE available , but at a price , see the link below http://www.mr-resistor.co.uk/item.aspx?g=&t=104&r=189&i=4128&a=0 Nick

Also make sure you have actually changed the wire in the downstairs fuse as it is not unusual for the fuses to be labelled wrongly by someone. You may have changed the upstairs by mistake . Nick

As long as your client does not want to turn them off then it should be fine, as far as i am aware these sockets are all unswitched so to turn off means unplugging the appliance. Nick

Try telling that to the americans and canadians they use them on everything over there. Nick

You can have as many spurs off of a ring final as you have sockets on the ring final , however what you cannot have is a spur off of a spur. Nick