> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu]On Behalf
> Of Brian Harris
> Sent: 22 January 2007 08:49
> To: piclist@mit.edu
> Subject: [EE:] Mains outside
> 
> 
> Hi Joe,
> 
> What about stepping down to 24VAC or 48v if you have such transformers 
> and stepping up to 230V outside.
pretty pointless imo, the undergound cable provided a suitable cable type is used (CY should be ok as long as the braid is earthed so you hit earth first though i'd preffer something with steel in it) is a pretty low risk part of the outdoor power setup. 

also remember that if you divide the voltage by 10 and want to keep the power loss constant you will have to multiply the cable CSA by 100. If anything i'd be thinking about stepping up the voltage for a long underground run not stepping it down!


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