Motion picture handbook; a guide for managers and operators of motion picture theatres ([c1916])

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62 MOTION PICTURE HANDBOOK fuse blows and the system is unbalanced then the effect is that of forcing the lights on one side above candle power while those on the other side will burn below candle power. FIGURING WIRE SIZES To figure wire sizes for three-wire circuits you should proceed the same as for ordinary two-wire systems (page 55), considering only the two outside wires and the amperage necessary to operate the apparatus at 220 volts; then, having determined the size of the two outside wires, make the center wire the same size. Go to your work each day as though it were your first day on a new job and you had to make good.