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by the Department of Public Works, at the expense of the party owning it.
15. All wires shall be fastened upon poles or other fixtures with glass, porcelain or rubber insulators approved by the expert, and must be stretched tightly and fastened with a strap of the same kind of wire or other fastening approved by the Expert.
16. No wire shall be stretched within four inches of any pole, building or other object, without being at. tached to it and insulated therefrom. Any company refusing permission to make such fastening to its poles shall be judged guilty of violating this rule. All wires strung on house tops must be nine (9) feet clear of roof.
17. No wire shall hang within twenty feet of the pavement at the lowest point of sag between supports, except where required to reach a lamp or other connection, and must then be protected by extra covering and be rigidly fixed and out of the way.
18. Every line, pole, fixture, etc., must be kept in thorough order, repair, and conformity with these rules and specifications in every case where possible under the general permit for repairs (rule 31), upon penalty of forfeiture of all permits not actually acted upon and a refusal to grant new permits until the rule is complied with, but no additional poles or wires can be erected under cover of repairs, nor shall any route or location be changed without a permit.
ELECTRIC LIGHT AND POWER WIRES.
19. All electric light conductors shall be secured to insulating fastenings, and covered with an insulation which is water-proof on the outside and not easily worn by abrasion. Whenever the insulation becomes im. paired it must be renewed immediately.
20. All joints must be as well insulated as the conductors, and the insulation of joints must be maintained. A rigid insulating sleeve clamped over the joint is preferred.
21. Every wire must be distinguished by a number plainly marked on each cross-arm under the insulator, Day circuits must be conspicuously distinguished. All arc lamps must be so placed as to leave a space under. neath of nine (9) feet clear between lamp and sidewalk.