I Self built my bungalow back in 1981,and updating is necessary,in those days you could diy and get the electrics passed by electricity board,now I will sub the work but wish to specify what is required.I have read through pages of questions on this forum and screwfix forum,and have gained some knowledge of modern requirements.dwelling is out in the sticks,so earth is TT ,between the meter and fusebox there is a generator change over switch and a Chilton current operated earth leakage circuit breaker rated at 500ma.My plan is to use a split load 16 way MK csu,the with the ring main sockets protected by 30ma rcd,to protect the whole system I gather a 100ma ,rcd is now common practice but not essential,would it be ok to retain the 500ma breaker or is this now considered to be of too high a rating? External lighting query 3 gang switch in kitchen controls kitchen light and two external lights one on outside wall the other on garage 30 feet from dwelling,should these lights be on a 30ma rcd controlled circuit or on the higher rating rcd ? Freezers/fridges I gather rcd tripping (30 ma) can be a problem with these appliances but the dwelling has just two ring mains and supplies to appliances come off 13 amp sockets in kitchen and utility which must be 30 ma protected,3 out of four appliances are free standing so could be repositioned in future,is there an easy way over this problem as the only way I can see to solve this problem would be to add spurs to the ring with a wall mounted unit similar to an immersion heater connection (13 amp dp) for each appliance, Generator,the switch was the only unit which i had professionally fitted, as the mains had to be disconnected, but I have noticed that the switch is not earthed,I would have thought that it should be earthed , should I earth the generator direct to the earth rod,the generator is a small 1800 watt Honda or earth the switch to the earth busbar in the consumer unit?