>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
>On Behalf Of David VanHorn
>Sent: 23 January 2007 14:05
>To: Microcontroller discussion list - Public.
>Subject: Re: [EE:] Mains outside
>
>
>>
>> Sounds like my house.  The fuesbox is so full of wires that the 
>> previous owner seems to have simply chosen the fuse with the least 
>> wires in it when adding circuits! So my basement sockets are on the 
>> same fuse as my upstairs ring main, but basement lights are 
>wired into 
>> the ground floor lighting fuse.  At least the lights weren't wired 
>> into the cooker fuse I suppose...
>
>
>Do you have problems with light bulbs having short lives?
>
>I finally understood the cause of that..
>When you have a 220 feed to the house (here in the US)  It's a 
>center-tapped transformer. So if the load isn't balanced more 
>or less, then you end up having higher voltage on one side 
>than the other, and the side with the lighter load blows bulbs faster.
>
>What we have here, is I think six houses from one transformer, 
>so it's not just my load, but all the loads.

We don't use that system in the UK.  AFAIK a 415v 3 Phase supply (~240v to neutral) is distributed to residential areas, and the phases are shared between houses to balance the load.  Industrial buildings get all three phases of course.

Lamps in my house fail quickly because I seem to spend a lot of time going around the house turning them off, whilst my wife appears to have the opposite goal...

Regards

Mike

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