29-12-2011, 06:50 PM
(28-12-2011, 11:02 AM)Skywave Wrote: Rob - The drawing is only 'representative': it gives the general idea. Note the earthing connections.
Fuses: if the primary is wired to a fused 230-v. plug, I'd put a 3A fuse in that plug. As for the secondaries, not so easy to specify. Obviously, there is a upper limit of fuse current-rating so that the transformer secondaries are adequately protected. On the other hand, there is minimum size of fuse current-rating, which depends on the load: 1-amp would seem a sensible figure.
Al.
Al , I think it needs pointing out for Bob's sake that a 3amp fuse on the primary would allow the potential for over running the transformer significantly . He states that he wants to run 240volt out at the sametime as having 110volt out. The 2Amp fusing on the output would cause a maximum draw with both secondaries being used of just under 700 watts.
Maybe Bob could confirm he fully understands that the maximum current draw he is restricted to when using all of the windings is limited by the 500 watt rating of the transformer, otherwise it is going to get hot!.
Mike
