Really quick answer, plan for what you think you need, then install a conduit that will hold double that amount.
Pitot heat, roll servo, APARS power, wigwag, ??? all things in the wing you did not mention.
Wire gauge is driven by the load of whatever the wire is powering-----pitot heat may take 12, LED position may take 20. You need to determine the wire sizes yourself.
Go to the Vertical Power website for a good list of common devices, and the wire size, and breaker size they need.
__________________
Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010
Phase 1 done, 2/4/2011 
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
Last edited by Mike S : 04-01-2011 at 09:46 AM.
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