[Sent directly to Milstone by accident] I wrote:
3. In an insulated electric 3-phase cable, all four wires are bundled together under the insulation. Correction: all 5. As noted there is neutral and ground.The point is, you cannot disconnect individual ones without exposing them all. You cannot measure voltage on them without exposing them all. It is not possible that Levi et al. meant "cable" meaning the entire insulated bundle of wires.
- Jed
