Mike,
Many tears ago in the UK, we suddenly 'used' an incredible extra 1000kw from normal in one quarter. I suspected the metre had 'jumped', ( it was inside the house (UK), normal eddy current disc type ). Anyway, the poco refused to admit this could be a problem, and I had to stump up the money. Funny, they changed the meter for a new one though.....
Is this possible?
Alan
