[Heathkit] Question on the SB-230

[Mike McCarty]

Cold Old Stone Crab wrote:
> Got one of these that cleaned up pretty nicely for its age!
> Unit is wired for 115V ac. Info has been had on how to rewire it for 230Vor
> 240V A/C. No info on the other hand has been found about a fuse change or is
> there no necessity for a fuse change? Can't find any thing on this subject;
> help please!!!
> Thank you,


When changing mains supply it's pretty easy to figure the
fuse change. The total power remains constant, so

P = E*I

If the fuse is rated for, say 3 A, and you double the voltage
supply, then the actual current demand is cut in half, and one
can do the same for the fuse, that is, use a 1.5 A fuse.

If you go the other way, that is cut the line voltage in half,
then the current demand doubles, and one would double the fuse
rating, in this case to a 6 A fuse.

HTH

Mike
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