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Actually, there are single pin lamps available in 48 inches, but only as a T12. F48T12 would be a single pin lamp aka slimline, but is actually slightly shorter than the F40T12 we've come to know and love, because the sockets for slimline lamps take up more space than a normal bipin socket...

Yep until about the late 20s or sometime in the '30s when homes had 120 volt only services , they typically fused with hot and neutral. Sometimes the hots and neutrals could be tapped off different circuits. Three way switches could be wired in such a way that reverses the polarity at the...

Regarding BX cable, the armor especially if it were to rust or damaged in any way, can become extremely hot, if used as an equipment grounding conductor AND a hot to ground short occurs, and the armor offers enough resistance to limit the current flow to below the rating of the overcurrent...