I know exactly what you're talking about. That paper jacket. Then the ones with the semi-con and the splice material for it.
Yeah man, it changed depending whether or not I was in the utility local or an inside local. Inside, anything over 240 is high voltage.
In that particular utility local, 24 and under was low voltage, 25-12.5kv was medium voltage and everything over that is high.
They got really odd politics too that I never grew accustomed to. Their own training program, civil service code of ethics—the whole 9.