§ 39.277. Isolated or guarding lamps in series circuits.
(a) Arc and incandescent lamps and other devices in series circuits, except in grounded circuits of which no part exceeds 150 volts to ground, shall be effectively isolated or suitably guarded.
(b) All metal cable or chain supports for lamps shall be effectively insulated from the lamp or shall be permanently grounded. Isolation will ordinarily be deemed sufficient when a vertical clearance of eight feet is provided from floors or other ordinary accessible places within buildings, of 10 feet from footways outside buildings and of 15 feet from roadways. Horizontal clearance from windows, porches, and other spaces accessible to the general public should be not less than three feet.
(c) Lamps shall be secured from falling on persons or traffic passing below, and the hanger, rope, chain, or other means adopted for holding the lamps shall be regularly and systematically inspected. Metal chains or wire cables used for lowering lamps in series circuits shall be interrupted by a suitable strain insulator the minimum height of which from the floor or ground shall be 8 feet, whether the lamp is in position or lowered.
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