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What is not so cool is that the mains in my area seems to have gone up to 250v.

Mine has been up above 250v for most of this year, regularly triggering my UPS's trim feature. As of last week it now is down near 220v, regularly triggering my USP's boost feature. A series of big droops this week as well, enough to take the ADSL line down.
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Remind me to change my signature to something more interesting someday