Main D/P Switch size??

[c.boy]

Hi all

Looked at a job today and the customer is adding quite a bit onto a bungalow with 2 new extensions.My ? is, will a 100amp main switch be big enough? the new d/b will consist of:

3 x shower circuits, all showers are 10.5 kw
4 x rings
1 x water heater
4 x lighting
1 x heating

 

[Guest123]

Well what size is the main suppliers fuse???

No more than 100A for sure.

 

[ezzzekiel]

as lenny states the service fuse will be a 100a max anything else and your looking at a 3phase head

 

[johnboy6083]

although there are calculations for diversity, its upto you as the designer of the installation to decide how much diversity to apply. what is the likelyhood of the whole place being lit up like a christmas tree? are all showers going to be used at the same time? same with the rings.

 

[c.boy]

Well what size is the main suppliers fuse???

No more than 100A for sure.

Thanks think i have just had a propper blond moment!!! doh!!!

 

[Guest123]

Thanks think i have just had a propper blond moment!!! doh!!!

Seems that way.