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uksparks

uksparks

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Hi,

Ok so the new meter has been installed and the customer now wants 4 storage heaters, you can see the meter below.

Whats the best way to go about it as theres only one output.

He needs a new consumer unit anyway, do I just put it all in one CU or split it and have it in two CU's

But the timer issue, shall I use a contactor and a time clock inside a separate CU to feed the heaters?

[ElectriciansForums.net] Storage heaters
 
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I would probably install one CU with a contactor and timeswitch installed in it, the contactor would switch the feed to the 4 MCBs for the storage heaters.
So for the layout of the board you would have a main switch, followed by your 24hr circuits, then a couple of spares then the contactor followed by the controlled circuits with the timeswitch at the end.

All in one box, nice and neat.

Also I would install a basic mechanical timeswitch rather than a fancy digital one, it's only got to switch on and off at the same time everyday.
 
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Dave, I like your idea, I am planning on installing a 5+5 Hager board with Dual RCD, so Im just wondering about there being too much load on one RCD? I think theres two 3.5kW heaters and 2x 2kW, so 11kW in total probably.

Im just trying to visualise it in a board, maybe if I go for a large hager board, like one of those big ones, not sure of the model, ill get it all to fit.

So it will go

RCD ONE
MCB1
MCB2
MCB3
MCB4
MCB5

RCD TWO
MCB1
MCB2
MCB3
MCB4
MCB5

This is then the issue, do I put a third RCD in? its going to be too much with the rest on that RCD.

Perhaps just putting a smaller board in for them would be easier as I can use an RCD as main switch, then the MCB to fuse it down for the contactor wiring then then the time switch then the MCB's

what do you think?

Presumably I am switching the contactor with the time switch anyway, so its not like its going to switch 50A or something.
 
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why not just install 2nd consumer -unit for s/htrs and apply for off peak metering...E7 / E10. Or am I missing something here?
Don't forget you have to inform Supplier /DNO that you intend to increase load.
no requirement for contacter etc
 
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driverman said:
why not just install 2nd consumer -unit for s/htrs and apply for off peak metering...E7 / E10. Or am I missing something here?
Don't forget you have to inform Supplier /DNO that you intend to increase load.
no requirement for contacter etc
Click to expand...

They have just had the meter changed for a dual rate one to supply E7 (see pic in OP), so they already have the metering in place. A contactor or other time-control is required as it is a dual rate meter.
 
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uksparks said:
Dave, I like your idea, I am planning on installing a 5+5 Hager board with Dual RCD, so Im just wondering about there being too much load on one RCD? I think theres two 3.5kW heaters and 2x 2kW, so 11kW in total probably.
Click to expand...

The obvious answer to that is that teh RCD won't be overloaded if you choose the right size RCD ;)

uksparks said:
Im just trying to visualise it in a board, maybe if I go for a large hager board, like one of those big ones, not sure of the model, ill get it all to fit.

So it will go

RCD ONE
MCB1
MCB2
MCB3
MCB4
MCB5

RCD TWO
MCB1
MCB2
MCB3
MCB4
MCB5

This is then the issue, do I put a third RCD in? its going to be too much with the rest on that RCD.

Perhaps just putting a smaller board in for them would be easier as I can use an RCD as main switch, then the MCB to fuse it down for the contactor wiring then then the time switch then the MCB's

what do you think?

Presumably I am switching the contactor with the time switch anyway, so its not like its going to switch 50A or something.
Click to expand...

What is on the other 10 MCBs? don't forget diversity, the average house will rarely draw more than 20A plus the storage heaters should only be coming on when most other load is off.

I hadn't even consider a twin RCD board as I just don't fit them, I only use SPSN RCBO's. I guess it is personal choice and available space which decides whether you put it all in one board or two, but don't forget you will need one single main switch so may be an idea to feed the second board from the first.
Personally i'd look to get it all in one board as in my opinion it looks neater that way.

Have you considered the hot water in your designs? if they are having off peak heating they will benefit from a dual element hot water tank with on and off peak elements, or at least for the existing immersion heater to be used during the off-peak period but with the ability to be switched on at other times if required (a standard immersion heater timeswitch, nothing fancy)
 
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dingledong said:
That's not a dual tariff meter ? Why is it sealed as an extra wire has to come out of it ! !
Now it's sealed you can't do that
Click to expand...

I cant see that another wire is going to come out of it looking at it on the photo he sent me, its 10 miles from my house so not particularly wanting to make another trip to look at it again.

davesparks said:
The obvious answer to that is that teh RCD won't be overloaded if you choose the right size RCD ;)

What is on the other 10 MCBs? don't forget diversity, the average house will rarely draw more than 20A plus the storage heaters should only be coming on when most other load is off.

Personally i'd look to get it all in one board as in my opinion it looks neater that way.

Have you considered the hot water in your designs?
Click to expand...

Very true, no they have a boiler, no immersion heater. The other MCB's yes half of them will be spare.

davesparks said:
They have just had the meter changed for a dual rate one to supply E7 (see pic in OP), so they already have the metering in place. A contactor or other time-control is required as it is a dual rate meter.
Click to expand...

Yes thats the plan...

driverman said:
why not just install 2nd consumer -unit for s/htrs and apply for off peak metering...E7 / E10. Or am I missing something here?
Don't forget you have to inform Supplier /DNO that you intend to increase load.
no requirement for contacter etc
Click to expand...

They know, as they changed the meter for it, but not sure that its up to the easier option so will need to look at the options now to get it all in one board.

Murdoch said:
Has the client applied to have E7? I wouldn't fancy paying full rate every night to heat my house!
Click to expand...

Yes its E7 or something for storage heaters, but i was hoping that it would have another wire out to be honest....
 
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