Priority Shower Boards

[John D v2.0]

I think he didn't read the post carefully enough to realise the point was the unit only allows one shower to operate at a time.
The rest is history.

 

[mwatsonxx]

I think he didn't read the post carefully enough to realise the point was the unit only allows one shower to operate at a time.
The rest is history.

No it doesn't, both can run if demand is <3kw, but if one goes >£3kw, one of them will be switched off.

 

[securespark]

 

[aptsys]

Well if you ensure only one is used at a time, why waste your money on this nonsense? Is your blood lust satisfied now?

It's to satisfy maximum demand on an installation.

 

[phatboy]

...if a house has one shower satisfactorily operating on mains water pressure, what happens if add another shower? Will the performance of my original shower improve or get worse?

That depends on the flow rate of the incoming water supply. On a good supply, absolutely nothing will happen when adding another shower.

 

[aptsys]

That depends on the flow rate of the incoming water supply. On a good supply, absolutely nothing will happen when adding another shower.

No, it depends on the pressure at the desired flow rate. The shower head is essential at providing back pressure on an instantaneous heater.

 

[ban-all-sheds]

No it doesn't, both can run if demand is <3kw, but if one goes >£3kw, one of them will be switched off.

Will you please tell us how many electric showers <3kW there are on the market.

 

[ban-all-sheds]

I think he didn't read the post carefully enough to realise the point was the unit only allows one shower to operate at a time.

And how did he behave when this became clear to him?

 

[John D v2.0]

I was trying to create an break from the loop

 

[SUNRAY]

I have regularly designed and built this sort of arrangement (albeit without the <3KW facility) simply with CT switches and contactors.

The first was a temporary botch on site to prevent 2 sump pumps running simultaneously as the common outflow was too small and the back pressure stopped either pumping.
I stripped the windings from a couple of 4 pole relays and replaced with a few turns of thicker enamelled wire to make current operated relays, then used the N.C. contacts to disable the other pump.

It was in use for several months while some building works were being done and then went into a site hut to stop the kettle being used at the same time as a fan heater. It may still be laying around.

IIRC the old box I used had a couple of hours run meters and wired those in too.

Edit: That does look like a nice solution to what is becoming a regular problem.

Edit 2: correct from N.O. To N.C. contact and it has also been used camping to prevent kettle being used at the same time as the toaster and microwave.

 

[ban-all-sheds]

Did you test or model how the device behaved when power was restored after an interruption?

 

[SUNRAY]

Did you test or model how the device behaved when power was restored after an interruption?

What this:

No, only expected it to be there for a day or two...
Otherwise I'd have done a proper job on it

 

[SUNRAY]

Did you test or model how the device behaved when power was restored after an interruption?

Why the question Ban?
Do you think this is a difficult thing to achieve?

 

[securespark]

There are no 3kW showers, but how many have eco settings with reduced power?

 

[ban-all-sheds]

Why the question Ban?
Do you think this is a difficult thing to achieve?

IIRC, when we've tried to design something using interlocked contactors it looked like you could get problems with how it behaved on restoration of power.