max demand

[elliot123]

When working out max demand do you add the Ib for each circuit together ?

 

[Baker1988]

not really mate as all the circuits wont be on there maximum current demand at the same time. Think diversity either apply diversity to each circuit and then add them up but the way I been taught you just add all the breakers up and times it by 0.4 that will give you a good idea of maximum demand

 

[elliot123]

The question ask max demand before diversity and so fought all the breakers added together ?

 

[Baker1988]

O I get ya yeah just add the breaker sizes up as you couldn't use more then that or just put main cut out size like the 100a dno fuse in your house as it wouldn't get any higher then that

 

[elliot123]

Thanks for the help its an assignment for my level 3 just one question I needed to answer

 

[Baker1988]

Which level 3 are you doing is it the 2357 or the 2365

 

[elliot123]

2365 but start my 2357 next month to do my portfolio and am2

 

[SirKit Breaker]

not really mate as all the circuits wont be on there maximum current demand at the same time. Think diversity either apply diversity to each circuit and then add them up but the way I been taught you just add all the breakers up and times it by 0.4 that will give you a good idea of maximum demand

Very good advice by Baker. I teach the 2394/5, and this is the method i teach to work this out. It is a rule of thumb calculation, if you do the design course, then you would probably have to do it accurately, but in the real world 0.4 method is near enough.

Cheers.............Howard