Hi vu is what airbus call fictious panels.This means that the panel has switches circuit breakers for more than one piece of equipment. Ie the fuel panel has switches and connectors for tank pumps. Connectors ,switches and circuit breakers are designated Vc. Main wire routes are
Vb. Therminal blocks are Vt. Pressure seals are Vs. There is a long list in the chapters 90 to 94 as far as I can remember in the wiring manuals. Also in equipment manual. There is alot of them.