Agree, plenty of grey area to cross but a fuse box is still a 'electrical' item.
You also can't use a simple rule like transmission/control of power and communications either, both can be done with 'Electrical', 'Electromechanical' or 'Electronic' equipment.
Well I guess you can (use simple rules), but they are not definitive.
A solid state relay is electronic, brings in the term 'Power Electronics'.
My background is as an electrician, that moved into power electronics and automation, then into data aquisition and telemetry.
So if electrons flow through it I have probably touched it, fixed it or broken it.
Sometimes all three on the same day :)

