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CH. XIII] REGULATIONS FOR WIRING 499
lated definite rules for wiring, insulation and the character and construction of fittings, the installation of apparatus and of lighting plants, etc. This national code of rules, with all authorized modifications found desirable from time to time, is published in pamphlet form by the National Board of Fire Underwriters for the guidance of those having electric wiring to do and apparatus to install. This board also publishes a list of electric apparatus and fittings which conform to this code. The two pamphlets can be secured by any one interested by sending five cents in stamps to cover postage, to the National Board of Fire Underwriters, 135 William St., New York City, N. Y.
General precautions : In wiring or changing wires and in working about the arc lamp, rheostat, etc., the current should always be turned off at a switch which will render all the wires and apparatus to be changed in any way entirely without voltage ("dead"), so that no matter what is done there is no danger of receiving a shock or of short-circuiting.
If "live wires" must be worked with, use the asbestos-patch gloves, and wrap the naked wires in asbestos paper so that it will be impossible to bring naked wires in contact. Remember also that a concrete floor, if at all moist, makes an excellent "ground" for the wires, and if a person stands on the moist floor with the wires in his hands the current is liable to pass through his body to the ground. It is safer to use a dry board or rubber mat on the concrete floor to stand on, or to wear rubbers.
§ 692. Municipal regulations for wiring, etc. — In addition to the regulations of the National Board of Fire Underwriters, it frequently happens that there are special regulations by the municipality concerning the number and character of the general lights in a theater, etc., and also the source of the electricity for the arc lamp and for the general lights. There may also be special regulations for the number and color of exit lights and the source of the current for supplying them. It is necessary then to know, not only the latest regulations of the National Fire Underwriters, but the regulations of the city or state where the electric plant is installed.