norfolksparks
Junior Member
- Joined
- Jun 1, 2008
- Messages
- 9
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I know this is always discussed to death but i could never find a real solution to working this out. I know how to do it from the tables taking into account diversity etc but i changed the board in my own house and doing it properly, maximum demand came out at 117 amps with the supply fuse being 100 amps. That's without taking into account the other dist board that feeds my 9.5kw all electric central heating boiler!
Anyway had my Elecsa assesment last week (passed) and used this board for my assesment. The two guys that came out were very thorough, professional, and helpful. Had a bit of a chat with them after and i asked the assessor the easiest way to work out maximum demand. He said that there is no real accurate way of doing it, too many variables, he went on to say that he used to work for the electricity board and they did it a different way.
He said add all the values of the breakers together then multiply them by 0.4 (think he called it the 5 amp rule but not sure why!). I tried this method and the maximum demand came out at a more reasonable 69 amps, this is the method i will be using from now on. Good enough for him, good enough for me!
Anyway had my Elecsa assesment last week (passed) and used this board for my assesment. The two guys that came out were very thorough, professional, and helpful. Had a bit of a chat with them after and i asked the assessor the easiest way to work out maximum demand. He said that there is no real accurate way of doing it, too many variables, he went on to say that he used to work for the electricity board and they did it a different way.
He said add all the values of the breakers together then multiply them by 0.4 (think he called it the 5 amp rule but not sure why!). I tried this method and the maximum demand came out at a more reasonable 69 amps, this is the method i will be using from now on. Good enough for him, good enough for me!