2-phase power doesn't exist either, it would make no sense. 3-phase power cables have 5 wires anyway. Ground, neutral and phase 1,2,3...
Or just 4, ground and 3 phases.
In the US 208V 3ph is usually wired delta so there is no neutral.
2 phase is used and does exist. It's just a center tapped transformer. The fact that the two phases are 180 degrees apart is what makes them two phases.
On 18/04/2005, at 16:32, Larry le Mac wrote:
From: Beniamino Cenci Goga <[EMAIL PROTECTED]>
<snip>the free wires (usually 3: the ground, usually yellow and green, and the two phases)
Uh, one phase and neutral...
---
From: Claire Hart <[EMAIL PROTECTED]>
<snip>
Yikes! What if there are four wires, and they are red and yellow, black and white?
Hmm, I've never heard of a 3-phase PowerBook (yet)...
Ah, unless you've gone for the phone socket, that has four wire but I doubt enough current to run a PowerBook...
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