Thanks fenland! It is just that the reports I have heard of very thin Teflon insulation on aluminium wires make me concerned.
Joy Ride,
You are welcome, I think you will find this 'thin' insulation issue goes back a few years and is in the public domain. Quite early on the insulation thickness on the wires carrying 230VAC in the unpressurized areas was found to be on the limit for incipient discharge (corona) when airframe aging was taken into account so it was increased despite the weight penalty that was incurred.
I'm pretty sure the insulation on other wires is no different from other airplanes and most of it is copper, just the really chunky stuff moved to aluminum.