I'm going to build a dual rail power supply for some op-amp projects. I've got all the necessary 'bits and pieces' and have done the basic layout and am happy with my work so far. But, one question remains...
Where to place the (live) 'line' fuse? What is 'best practice', to place the fuse between the mains supply and the 'On-Off' switch, or between the switch and the primary transformer windings?
An engineer friend of mine say's between the switch and the transformer. The reason I'm seeking further input is that the switch is a SPST 240v(6A) (led indicator) with three contacts and 'logic' tell's me to put the line fuse before the switch.
What do you think? Does it actually make any difference?