14 new 9.5kw showers to be installed on existing supply

[telectrix]

Just let the old buggers stink, problem solved

or take 'em to the council owned public swimming pool once a week. there's enough chlorine in there to kill half of them off.

 

[davethsparky]

You can't base anything on the load you measured as this measurement was only at a particular moment in time when you had the clamp meter on there. That doesn't give an accurate assessment of average or peak loads.

I would suggest you can't just assume showering times will be staggered, it will depend on the type of people in the sheltered accomodation. If they are people who have become institutionalised over their lives for whatever reason they may very well all follow the same routine either by accident or design.

 

[sparky351355]

You can't base anything on the load you measured as this measurement was only at a particular moment in time when you had the clamp meter on there. That doesn't give an accurate assessment of average or peak loads.

I would suggest you can't just assume showering times will be staggered, it will depend on the type of people in the sheltered accomodation. If they are people who have become institutionalised over their lives for whatever reason they may very well all follow the same routine either by accident or design.

Again true dave what I'm after here tho is as I said what load what you put for the new showers per phase?

 

[davethsparky]

I can't honestly say what I would put as the load per phase at the moment. I was taught a very old fashioned idea when dealing with 3 phases supplying single phase loads, basically keeping circuits on different phases separated, ie all simultaneously accessible sockets and lights on the same phase whilst still maintaining good phase balanceing.

So I would want to know which phase the wiring in each bathroom was connected to before deciding how many end up on each phase, and of course an accurate view of the existing loading and phase balance.

 

[i=p/u]

I've seen it quite a few places where certain room or area is all on 1 specific phase.

what about priority switching on a bigger scale

 

[kingeri]

I would honestly push for a different solution. 14 x 9.5kw showers is not the way forward. I would struggle to apply diversity here as well, who's to say the showers won't be used all at once, ok maybe not now but in the future? At the very least, why not look at 7.5kw showers for a start! What's the need for 9.5's?

 

[sparky351355]

I am planning to split the load over 3 phases fed from a consumer unit on each floor via main dis board, the rooms don't have there own c/us so this makes thing a little simpler, diversity as follows:-

14 x 9500=133000
133000/3
44,330/230=192A

div=
2 x100% + 3x25%

 

[davethsparky]

How exactly are you planning on connecting two thirds of a shower to a phase?

 

[Sintra]

Good luck with your sub mains and ct's etc for that lot. Sounds absolutely crazy what you are trying to do.

 

[i=p/u]

Get 14 showers connected and be happy with his decision

 

[kingeri]

I wouldn't even consider it. And you say that the water supply isn't your concern but it would be when the showers don't work due to lack of pressure........wouldn't it? I've seen this happen with only two showers in use!

 

[i=p/u]

Not everyday do you say call in the plumber

 

[Guitarist]

Have to agree. 14 electric showers in this situation seems like a crazy way to go.

 

[i=p/u]

I remember doing a washing facilities at caravan park , probsly 10 power showers were used and had a tank out back 4 times size of oil tank.. And massive pump buried out the back........ Mechanical

 

[sparky351355]

Might be worth me raising a concern over the water issue agreed! However i will have 375 A to play with here I'm sure a supply of that size and I'm sure the chances of even 50% of the showers being on at the same time ( even assuming that the the shower is at full wack(9.5kw)) this is manageable , when all that we have is low energy communal lighting and a couple of t.v.s running.