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[zirk]

Im referring to Economy 7 Meter and wiring, which is installed here about 25 years ago,and which we dont use, or least the Storage Heaters anyway.

Question is this, when the Cheap rate kicks in, you can hear the a loud relay clicking in near the Meter, I assume this then feeds the pre installed wiring that feed each Heater, guesing there 16 A spurs to each one?

So does the cheap rate supply only apply to the heating wiring, or the whole normal House wiring?, ie if I put a Timer on the Dish Washer and Washing Machine plugged into the normal 13A Ring supply, to kick in at say 2am, will this use the Cheap Rate Supply Tarriff or would they need to wired to the Heating Supply?

I asked the question to a number of people now including my Lic'y Supplier with mixed answers!, anyone know for sure?

Cheers Chris. 

[tigers_gonads]

How many consumer units have you got Chris ?

[zirk]

I'll go and have a look. 

[Marks DTM Calib]

You often see two consumer units for the older E7 installs with storage heaters, the contactor switches the supply on/off to the second consumer unit.

As for the question re-dishwasher etc, yes, simply fitting a timer to operate the devices during E7 times will result in billing at E7 rates if you have the the modern meters with dual tarif on the them

[zirk]

Right had a quick look, loads of wires going everywhere so bare with me, and its a 70's build house.

Looks like a Have SWA in that feeds a Master Fuse and Connection Block, 3 wire out of that, 2 Thick, 1 Thin, the 2 Thick go to the LCD Meter (Meter replaced by E- on about 10 years ago), The 1 Thin wire goes via a Fuse to a stand alone Big Black Box (Guessing this might be the Relay).

From the Meter various Thick wires to the Main Fuse Board, 1 thick wire goes to the Black Box (Relay?) and then back out again to feed a separate White Fuse Box which looks like it feeds the Heating Spurs.

Also checked the Main Meter and it gives me Peak and Off Peek readings.

Hope that helps. 

[tigers_gonads]

Right, your white box sounds like its a dedicated unit for the eco 7.

Might be a bit naughty  but how far away is the washing machine from the nearest storage heater ?

[zirk]

Right, your white box sounds like its a dedicated unit for the eco 7.

Might be a bit naughty  but how far away is the washing machine from the nearest storage heater ?

Theres a Heater in the Kitchen not near the Dish / Washers but do-able for re route.

[Kevin Wood]

Yep, the meter is programmed to switch tariff and, when it does so, it energises the relay via the "thin" wire, causing the storage heaters to start charging via the white consumer unit.

The meter will record all consumption at the economy 7 tariff during this period, so it's enough just to set a timeswitch for any other appliances.

[tigers_gonads]

Right, your white box sounds like its a dedicated unit for the eco 7.

Might be a bit naughty  but how far away is the washing machine from the nearest storage heater ?

Theres a Heater in the Kitchen not near the Dish / Washers but do-able for re route.

Right bud, IF IT WAS ME, and the dishwasher cable can be re route to reach the spur, remove the plug of the dishwasher wire and connect it into the fused spur for the storage heater after removing the heater wires 
Make sure you have a 13 amp fuse fitted to the spur.
Taking that all the fuses in the white unit are removed, replace the one for the kitchen and your sorted.

[tigers_gonads]

Or .............. you can contact your service provider and get them to remove the heater side and connect the full house up (which will cost you a shed full of money) 

[Marks DTM Calib]

Or just buy a cheap timer for a tenner.

[tigers_gonads]

Iirc, if you replace the spur with a socket and plug a mechanical timer into it, it constitutes a change of use which (and I haven't checked yet) comes under Part P 

Chris, is your dishwasher the old mechanical type ?
Or if its electronic, does it have a timer (power on) facility on it ?
In other words, can it be set up so that when power is applied it kicks straight into wash cycle ?

[zirk]

Ok, thats all, so to confirm the existing wiring from the Normal CU will give me Off Peak rates, or am I looking at re routing each E7 Spur to fit the bill?

In that case Im kind of thinking the whole idea off having a second E7 CU feeding each Heater via a relay is so the Heaters cant be accidentally switched on during the day time and gobble up the Lic Bill on Peak Rate?, correct?.

[tigers_gonads]

 

To get your houses consumer unit to give you eco 7, you have to modify the incoming mains to that consumer unit.

If you are only talking about the dishwasher then i'd reroute the cable as per the other post 

[Marks DTM Calib]

No you dont.

The meter will record E7 consumption of either boards.

So a simple plug in timer will do the job.