Modern Electrical Construction: A Reliable, Practical Guide for the Beginner in Electrical Construction, Showing the Latest Approved Methods of Installing Work of All Kinds According to the Safety Rules of the National Board of Fire UnderwritersF.J. Drake & Company, 1916 - 439 стор. |
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alternating current amperes approved arc lamps armature armored cable arranged battery bends binding posts braid building bushings cabinets ceiling cent circuit breaker circular mils cleats coils conductors connected construction copper covered wire cut-out degrees Centigrade degrees Fahrenheit Department having jurisdiction designed device diameter direct current dynamo electric enclosed exposed Fahrenheit fastened feet fixture flexible cord floor fuse gage gas pipe ground wire heat inch in thickness installation rules insulating covering insulating material iron junction boxes knobs lead least less liable lightning arrester lights located metal conduit meter moisture motor moulding mounted National Electrical Code neutral wire non-absorptive non-combustible ohms one-half inch operating outlet boxes overload placed plate pole porcelain potential prevent protected receptacles resistance rheostat rubber insulating screws secured short circuit shown in Figure side socket soldered stranded supported switch switchboard tape terminals tion tube voltage volts wall waterproof watts
Популярні уривки
Сторінка 276 - 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 134 - Must be so placed in wet places that an air space will be left between conductors and pipes in crossing, and the former must be run in such a way that they cannot come in contact with the pipe accidentally. Wires should be run over, rather than under, pipes upon which moisture is likely to gather or which, by leaking, might cause trouble on a circuit.
Сторінка 167 - Switches should be placed on all service wires, either overhead or underground, in a readily accessible place, as near as possible to the point where the wires enter the building, and arranged to cut off the entire current.
Сторінка 316 - ... must be of such a nature as will not have a deteriorating effect on the insulation of the conductor, and be sufficiently tough and tenacious to withstand the abrasion test of drawing long lengths of conductors in and out of same. h. The insulating lining must not be mechanically weak after three days...
Сторінка 146 - Arc lamps, when used in places where they are exposed to flyings of easily inflammable material, should have the carbons enclosed completely in a globe in such manner as to avoid the necessity for spark arresters. For the present, globes and spark arresters will not be required on so-called "inverted arc...
Сторінка 232 - Must be so suspended that the entire weight of the socket and lamp will be borne by knots under the bushing in the socket, and above the point where the cord comes through the ceiling block or rosette, in order that the strain may be taken from the joints and binding screws.
Сторінка 394 - All elbows or bends must be so made that the conduit or lining of same will not be injured. The radius of the curve of the inner edge of any elbow not to be less than three and one-half inches.
Сторінка 60 - ... is permitted, except when installed where oils, grease, oily vapors or other substances known to have rapid, deleterious effect on rubber, are present in such quantities and in such proximity to motor or dynamo as may cause such bushings to be liable to rapid destruction.
Сторінка 167 - Single-throw knife switches shall be so placed that gravity will not tend to close them. Double-throw knife switches may be mounted so that the throw will be either vertical or horizontal as preferred, but if the throw be vertical a locking device shall be provided which will insure the blades remaining in the open position when so set.
Сторінка 398 - With arms held straight, swing forward slowly, so that the weight of your body is gradually brought to bear upon the patient. The shoulder should be directly over the heel of the hand at the end of the forward swing. Do not bend your elbows. This operation should take about two seconds.