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How about - you have connected the neutral from the RCD protected circuit to the neutral bus bar of an unprotected circuit?

Thanks for your comments guys.

Need some help please. Have been asked to wire 3 x 50W, 230V luminaires that have been pre-fitted in a kitchen ceiling by the customers builder. There are no fitting instructions and the only markings I can see are the minimum distance (9th down on LHS of table 55.2) and 'for use with self...

Shame that the people that write this do not understand that, in most cases, people will not be willing to fork out for a periodic and then for the remedial work - probably pertinent to domestic situations. They should separate commercial and domestic regulations and make sure that the latter is...

Try reading this ..............it may help. http://www.theiet.org/publishing/wiring-regulations/mag/index.cfm The article you need is entitled 'Additions and alterations'. Regards

Why did the ant fall off the elephants leg? It got ****ed off......................................

Is the melting temperature of lead free solder higher than the old lead/tin solder? If so, that would explain difficulties when trying to desolder using a conventional iron on newer boards. Regards

Blacksheep, There will only be current flow through the baby to earth if the baby is in contact with something that provides a path to earth. For example, if sitting on a nylon carpet, there is unlikely to be any path to earth and therefore the RCD will not trip. In the instance cited...

Happy New Year You sure about that BAS? The RCD will detect any difference between phase and neutral currents. So if the baby bit through the bulb and happened to divert more than a nominal 25mA to earth the RCD would trip. If, however, the baby bit into the bulb and wasn't touching...

Readlines You have probably wired the permanent live into the bulb side live connection - check your wiring.

Mike, Have a look at the fitting and see what screws need to be undone to remove halogen bulb. Replace halogen bulb with one of the same power rating (without touching glass envelope) and do the screws up again. Have a cup of tea to celebrate your monumental achievement.

have a look at this link - it is from Wiring Matters - an IET publication - it may help. http://www2.theiet.org/Publish/WireRegs/WiringMatters/Documents/Issue23/2007_23_summer_wiring_matters_marinas_and_similar_locations.pdf

Marvelling oblvious isn't it pram?

Neons will not strike until the voltage across the electrodes has reached 70-80 volts.

I think you'll find that OL means 'Over Limit'. It does not mean over loaded.

How about:- For any new installations after 1st July 2008, CU installs and changes are required to be carried out to the 17th specification. That means that all of the installation must comply with the 17th edition. For CU changes on existing installations (and where fitting of a new CU...

A woman is standing nude, looking in the bedroom mirror. She is not happy with what she sees and says to her husband, 'I feel horrible; I look old, fat and ugly.I really need you to pay me a compliment.' The husband replies, 'Your eyesight's damn near perfect.' And then the fight...