Economy 7 Meters

[Hopkirk]

How does an economy 7 meter know it is time to change between rates?

Do they get sent a message, or do they have an internal clock? If it's a clock, how do they reset after a power cut?

[fiction-factory]

It's okay margarettom- even the answers I've got from suplliers have been inconsistent- perhaps because I have changed suppliers and I'm not sure my original supplier from when the meter was installed still exists- although I think there must be a central register of meters. I also think the person who fitted a replacement meter 20 years ago when ours stopped working gave me some wrong info (he said there were two night time periods with a one hour gap between).

Yes, I think you must be right eddie as despite numerous power cuts my bills still show that 50% of my consumption is consistently at night rate which is what I aim for with washer, water and dishwasher on timers and I only use the tumble dryer at night rate times.

[EDDIE51]

Thinking about this we have been missing the obvious .The UK mains frequency is 50 cycles per second. So it acts as a built in clock. Every 50 cycles is one second. As long as you are in the EU / UK that is. In the USA & Canada the mains frequency is 60 cycles per second. Which is why any US electrical devices with a clock will run slow in the UK / EU even if you use a transformer to correct the voltage.

[Zacs-Master]

It’s down to the Kosovans and Serbs.