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I have a 30 A ring circuit and wish to install a 20A double pole switch on the ring to feed a single socket. ( The 20A double pole switch will be above a work top and the socket will feed a washing machine ) I am assuming this arrangement is ok. I have never seen it in print or DIY books...

The output of my garden lighting transformer is 12 volts ac. Is there any technical reason reason why ac is used as opposed to dc....or is it just the case of why not. I guess ac transformers are slightly cheaper than dc variants. The bulbs are also marked as 12 Volts 7 watts. This would...

Does anyone know of a mains operated smoke detector that can be interlinked using low voltage alarm cable? All the smoke detectors, I have seen use three core and earth for the linking. __________________________________ Moderator split from hi-jacked post

Can anyone recommend suitable electrical software that would run on a PDA? I am looking for software that would calculate voltage drops, power consumption, etc and include data for all the relevant UK cables. I have found a few web based calculators but thought it would be useful having...

When a cable manufacturer quotes a current capacity for mains cable, would this figure also be suitable for DC current. For example, 1 sq mm cable is normally quoted as having a current capacity of 15A. Would this cable be able to carry 15A at say 12 V dc? I would have thought that the...