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UPDATE: Hi Everyone An electrician has just come round to have a look and found no problems and everything is tight. I now suspect that the answer is as follows: It may actually be the case that the fault is outside the building after all and what I experienced last Friday may be explained...

Hi Sharpend. Thank you very much for your reply.

Hi Everyone Thank you very much indeed for all your replies so far. It therefore looks as if we will need to get our wiring investigated. In the meantime, I have another question: How long can a loose connection exist for before there is a permanent failure? Can it exist without getting worse...

No there isn't. When I say it is three or four times a month, it is actually somewhat random.

Hi Doc H Thank you very much for your very informative reply. Please excuse this newbie question but what do MCB and CU stand for? One thing to note is that the server and the other computer on the same circuit are always effected at exactly the same time. It is as if the whole circuit is...

What is the threshold temperature, above which there could be a problem?

Hi Onoff Thank you very much for your informative reply.

Thank you, Andy,  very much for your reply. To be honest, I might be wrong but I am doubtful if it is a loose connection because, as I mentioned, it only happens three or four times a month and I don't know what would vibrate the building enough as seldom as that. The building is nowhere near...

Hi Everyone I work in a building in Hammersmith in London which has several circuits in it where each circuit has its own trip switch in the fuse box. Approximately three or four times a month, we get a sub-second power outage which only effects some of the circuits in the building and it does...