Practical Electric WiringD. Appleton, 1915 - 256 стор. |
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alternating current amperes annunciator armature armored cable backing battery bell wires binding screws box bushing branch circuits burner button cabinet box carried cell cellar circular loom circular mils cleat Code coil concealed knob condulet connected copper cut-out diagram Diameter Diametral Pitch direct current drilled drop cords duit Explain the method feet FIGURE floor boards floor joists flush switch friction tape fuse gas pipe Gauge ground holes inches insulation joint joists knife switches knob and tube lamps lights magneto mains metal molding meter motor nail National Electrical Code Number of Teeth open circuits outlet box partition plaster porcelain porcelain tubes putty knife resistance rheostat rigid conduit rosette short circuit shown in Fig side single-pole snap switch socket soldering splice split knobs straight electric surface switch box telephone threads usually voltage volts wall watts wet cell wireman wires pass wood screws wooden molding wrapped
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Сторінка 203 - When the wires are carried in approved cables, the next three sections (c, d and e) do not apply. c. Where wires are attached to the outside walls of buildings, they must have an approved rubber insulating covering. and on frame buildings or frame portions of other buildings shall be supported on glass or porcelain insulators, or knobs. d. The wires from last outside support to the cut-outs or protectors must be of copper, and must have an approved rubber insulation. Must be provided with drip loops...
Сторінка 11 - Must be so spliced or joined as to be both mechanically and electrically secure without solder. The joints must then be soldered, to insure preservation, and covered with an insulation equal to that on the conductors.
Сторінка 204 - Must run in as straight a line as possible to a good permanent ground. This may be obtained by connecting to a water or gas pipe connected to the street mains or to a ground rod or pipe driven in permanently damp earth.
Сторінка 203 - Outside wires should be run in underground ducts or strung on poles, and kept off of the roofs of buildings, except by special permission, and must not be placed on the same cross-arm with electric light or power wires. They should not occupy the same duct, manhole or handhole of conduit systems with electric light or power wires. Single manholes, or handholes separated into sections by means of partitions of brick or tile will be considered as conforming with the above rule.
Сторінка 9 - Main or Feeder run exposed. Branch Circuit run concealed under Floor. Branch Circuit run concealed under Floor above. Branch Circuit run exposed. -»- - Pole Line.
Сторінка 205 - ... mains. In every case the connection shall be made as near as possible to the earth. When the ground wire is attached to a water pipe or a gas pipe, it may be connected by means of an approved ground clamp fastened to a thoroughly clean portion of said pipe, or the pipe shall be thoroughly cleaned and tinned with rosin flux solder, and the ground wire shall then be wrapped tightly around the pipe and thoroughly soldered to it. When the ground wire is attached to a ground rod driven into the earth,...
Сторінка 10 - It is important that ample space be allowed for the installation of mains, feed, crs, branches and distribution panels. It is desirable that a key to the symbols used accompany all plans. If -mains, feeders, branches and distribution panels are shown on the plans, it is desirable that they be designated by letters or number* Heights cil Centre of Wall Outlets (unless otherwise specified) LiTing Rooms 5' 6" Chambeis 5' 0' Oflices 6' 0" Corridors 6 3" Height of Switches (unless otherwise specified)...
Сторінка 245 - Radius. Square root of the area of a circle X 0.56419 = Radius. Circumference of a circle X 0.31831 = Diameter. Square root of the area of a circle X 1.12838 = Diameter.
Сторінка 7 - Bracket Outlet; Electric only. Numeral in center indicates number of Standard 16 C. P. Incandescent Lamps. Bracket Outlet; Combination. $ indicates 4-16 CP Standard Incandescent Lamps and 2 Gas Burners. If gas only : Wall or Baseboard Receptacle Outlet.
Сторінка 246 - Area of its base x -J of its altitude = solidity of a cone or pyramid, whether round, square, or triangular. Area of one of its sides x 6 = surface of a cube.