I use extension cables, but don't use the plugs/sockets, I make sure that the 240V stuff is Yellow, and the 5/12v is White/Grey.I don't like using extension cables like that because it could be easy to confuse which lead is actually a 240v plug and which is being used for your low voltage stuff. That's just me though, each to their own, so long as you are comfortable and confident you can tell the difference.
Easy way to tell the difference, and the Yellow is really only going into the control box's.
Add to clarify: I'm referring to the whole extension lead, not the individual cores inside.
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