Is there a cable or device that can turn on and off EU flow with redstone?
Switch cable cable replacement
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You could use a transformer (connect it correctly and then trigger it with redstone to cut off the power).
Would be nice if the cables were movable by pistons -
Yea that'd work, not quite what I was thinking of though :p I like the piston idea.
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yea would be great if you could even push the cable with a piston