Installing 2x9.8kW showers

[custard2000]

Hi,
I've been asked to install 2x9.8kW showers in a domestic dwelling. I realise they will need 2x 45A MCBs in a 100A/30mA RCD enclosure (no space in current CCU. However i've calculated this will require over 80A (can't apply diversity to showers). Therefore seeing as there is a 100A BS1361 main fuse, i would think the possibility to overload the main fuse is quite high, especially in the morning when kettles, toaster, ovens etc are possibly on at the same time as the showers.
Your help would be gratefully accepted. Many thanks

 

[PrenticeBoyofDerry]

main fuses are quite resilient, i've seen boards with 3 times the rating.
What you need to remember, it is rare that all the circuits in the board are fully loaded at one time.

 

[ban-all-sheds]

3x the rating maybe, but what's the maximum demand?

 

[PrenticeBoyofDerry]

3x the rating maybe, but what's the maximum demand?

I'd be picking a number out of the air bas, but with assumed current, rated current, and connected load, etc. diversty from the total rated values of the protective devices, the demand will differ.

 

[ricicle]

Is the water supply adequate to fully feel the benefit of these two showers if they run both at the same time ?

 

[custard2000]

Is the water supply adequate to fully feel the benefit of these two showers if they run both at the same time ?

Not sure, that'd be one for our wet friends, the plumber. PS. If Electricians are Sparkies, Carpenters are chippies, what are plumbers? Keep it clean!

 

[PrenticeBoyofDerry]

turd touchers

 

[Goldberg]

what are plumbers?

Honest, reliable, punctual, intelligent, educated, understated, modest, patient, understanding, and compassionate.

Oh, and their personal hygiene is beyond reproach.

 

[ban-all-sheds]

http://www.youtube.com/watch?v=dijAhBgEgDs

 

[gman76]

Like that BAS

 

[mikhailfaradayski]

Nice1 BAS, not only do we all know somebody like that, it actually looks like the guy im thinking of.