3 phase submain showers

[brianmoooore]

Don't forget that a lot of what you are proposing has no diversity allowance when calculating currents. You have to assume that all the electric showers nd water heaters are in continuous use, unless you include devices to ensure that they all can't be used together.

 

[baldelectrician]

Hi, I'm working in a building which has a three phase supply. There is two electric showers, sockets, water heater and lights going in a toilet block/seating area. For this I'm looking to take a 10mm 4core cable to a submain near the toilet block and running everything from here. The run is about 20m. Would this be sufficient for two showers being used in the morning and evening regularly. Should I be looking at 7.5kw to keep to loads down?

Thanks.

If you are the designer YOU tell them what can be done (using max demand guidance / site specific info)
If they over rule you have THEM specify what they would like YOU to do and make them aware that they will take responsability for any failings in design

I would walk away of someone told me to do a job that could bite me in the rear

Make sure you cover your back. Have a email / paper trail to back you up.

Are you an employee or self employed?