WATER CYLINDER TIMECLOCK

[blah123]

Can someone please advise me on how to wire up my water cylinder?

i have recently bought a new water cylinder with two 3kw elements, wired in 2.5mm butyl flex back to a 32amp double pole switch/isolator which is wired in 2.5mm T&E back to a 32amp rcd breaker at the board.
does this sound ok?
and how would i incorporate a danfoss timeclock into this?
e.g. before the isolator or after or would i need two timeclocks?

any advice would be much appreciated!

thanks in advance.

 

[Spark123]

It is pushing it having it all fed from a piece of 2.5mm T&E to the point that it could be a fire risk. IMO 2.5mm radials shouldn't be fed from a 32A breaker.
The cylinders I am thinking of with 2 elements were designed with E7 in mind so you can have one on the E7 tarrif and the other as a top up.
The elements are both fed from their own circuit, one circuit on the normal board and the other on the E7 board.

 

[blah123]

its an OSO Super S hot water cylinder
what would you advise i do?
all i have done is crimped two butyl flex into the two elements and wired back to the 32amp DP SW.
I dont have E7 or offpeak heating.

thanks for your quick reply.

 

[Spark123]

Feed each of the elements from their own circuit to the consumer units and have two time switches, you already have one circuit so only means one new circuit in 2.5mm T&E.
Also have two isolators local to the elements.
Each circuit should be on a 16A MCB.

It would be possible to use a contactor instead of having two time switches but is more complicated and will probably end up being more expensive.

 

[AndyPRK]

I don't think you need both elements on at the same time for many reasons.

 

[londonboy]

I don't think you need both elements on at the same time for many reasons.

Yes I'd agree and advise to ditch the 11inch 'booster' immersion.

 

[blah123]

Would there be any problems with doing this...

Wiring both of the elements back to two 20amp double pole switches and just have one element (the bottom one) wired through a timeclock
both going back to two 16amp MCB'S

Therefore the top element will just be controlled via a 20 amp dp sw and only used as a boost or if the main one fails.

Hope this makes sense.

Thanks

 

[londonboy]

Yes because if you switch them both on your house burns down

 

[ban-all-sheds]

Why do you think that, Londonboy?

 

[electronicsuk]

Yes because if you switch them both on your house burns down

What a load of rubbish.

 

[blah123]

i wouldnt of thought having two circuits on seperate MCBS going to seperate elements would be dangerous but i may be worng?

what makes it dangerous? i could do without my house burning down!

 

[ban-all-sheds]

It's not, you're not, nothing and it won't.

 

[Spark123]

I still don't like the idea of a piece of 2.5mm with a pair of 3kw elements on a 32A MCB.

 

[londonboy]

So a 2.5mm can take 26 amps then??????????????

 

[TheOriginalTonkaToy]

So a 2.5mm can take 26 amps then??????????????

Keep up - the OP is now talking about 2 circuits on 2 separate MCBs wired in 2.5mm