Just seen this string. I sometimes feel a bit of an intruder here so I'll explain myself. I'm an electrical engineer who found employment in military aerospace. In my positions, over 35 years, as well as aircraft systems I was extensively involved in operating development engineering laboratories. This brought me into contact with contracting installers who had to cope with unusual systems, such as low voltage DC and 400Hz AC. We worked quite well together, mutually helping each other with all sorts of new installations. Grounding systems were the most difficult; almost, though not quite black magic, but close to it! We were after all trying to emulate the solid aluminium airframe in a laboratory environment!
Now in semi retirement I still find an interest in the technology of electrical installations, and still do my own household work, although this is now contrary to UK legislation, - (don't tell anyone because I'll deny it).
