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71. All switches, regulators, cut-outs, etc., must (a) be as nearly non-combustible as possible, (b) be protected from moisture, (c) have a backing of porcelain, slate, cement, asbestos, or other equally non-combustible substance, and (d) be perfectly insulated.

Wiring.

72. (a) Wire having a waterproof insulation must be used. (b) The wire must be rigidly supported (c) on porcelain, glass, or other noncombustible insulators, free from contact with the building, and (d) at least six inches apart. (e) No concealed work, (f) cleat-work, or (g) wires fastened with metallic staples will be approved.

73. (a) When wires pass through walls, floors, partitions, etc., or (b) wherever protection from mechanical injury is necessary, (c) they must be protected by glass, hard rubber,

cther moisture-proof, non-inflammalia tubing. (d) Soft rubber tubing will not be alproved.

74. These rules are not intended to preclude the running of small motors for fans and the like on low potential lighting circuits, the installation of which has received the approval of the inspector.

75. The entire installation must test free from grounds; but motors run on a “ground circuit" may be approved by the inspector, under these rules, provided the return

or

wire is carried to a ground outside of the building.

LIGHTING FROM GROUND RETURN POWER

CIRCUITS.

76. Electric railway power stations and their car sheds may be lighted by incandescent lamps connected with their power wires, if the installation of the wires meets with the approval of the Inspector, but no other property may be so lighted.

MISCELLANEOUS.

77. Splices, in both arc and incandescent circuit wires, must be made so that a perfectly secure and unvarying connection fully equal to the cross-section of the wire will be secured. The splice must be soldered, but solder must never be employed to complete a joint that would be loose or insecure without it Either resin or an acid solution may be used as a flux; both are objectionable if not carefully applied. 78. Architects

are urged to familiarize themselves with these riles, and to see that all contracts are made subject to the work being done in accordance therewith, and also to see that it is so done. The New England Insurance Exchange will gladly aid them to this end by giving information, advice, or inspection to as great an extent as possible.

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79. A great danger in all installations is from poor contacts; consequently avoid screw joints as much as possible; screw them up tight with good areas of contact; on account allow them out of sight. Solder every connection as far as practicable.

80. When an electrical fire breaks out, turn off the current at the nearest switch, or sever the conductors one at a time ; then use your appliances. The injudicious use of water with out these precautions may only increase the extent of the fire. In severing conductors of high electromotive force, be careful that you stand on a good insulator, such as dry wood, and that the handle of your hatchet is dry, or personal injury may result.

DEFECTIVE APPARATUS.

81. The electric inspector of this Exchange shall report to its Secretary such electrical apparatus as he finds is not installed in accordance with the rules of this Exchange.

82. The Secretary shall at once notify both the assured and the party installing the apparatus of all defects; and if at the expiration of thirty days from such notice he shall not have been duly notified that said defects have been remedied, the rate on both building and contents shall be advanced at least 10 cents, and the new rate duly promulgated by him.

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