The National Electrical Code: An Analysis and Explanation of the Underwriters' Electrical Code, Intelligible to Non-expertsC. A. Hewitt, 1896 - 222 стор. |
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Сторінка 36
... operates contin- uously . c . Data obtained from all tests must be preserved for examination by insurance inspectors . These rules on testing to be applied at such places as may be designated by the association having jurisdiction . 8 ...
... operates contin- uously . c . Data obtained from all tests must be preserved for examination by insurance inspectors . These rules on testing to be applied at such places as may be designated by the association having jurisdiction . 8 ...
Сторінка 38
... operate a two thousand candle power arc lamp , such as is commonly used in street lighting , is 10 amperes . It requires a pressure of 50 volts to send this current through one lamp . If now If we insert a second lamp in series with the ...
... operate a two thousand candle power arc lamp , such as is commonly used in street lighting , is 10 amperes . It requires a pressure of 50 volts to send this current through one lamp . If now If we insert a second lamp in series with the ...
Сторінка 39
... operate it properly , and to cause this " " ey operated at t 4B of the Ew CENTRAL STATIONS . 39 Circuits Multiple-arc Circuits -Al-
... operate it properly , and to cause this " " ey operated at t 4B of the Ew CENTRAL STATIONS . 39 Circuits Multiple-arc Circuits -Al-
Сторінка 40
... operated at t 4B of the Ew Piippose that we have a . eet one directly above an Ce in the bottom of ca dwfrom each tank ent to pass through the lamp we require a pressure 10 volts . If we have a pressure of 110 volts between wires , and ...
... operated at t 4B of the Ew Piippose that we have a . eet one directly above an Ce in the bottom of ca dwfrom each tank ent to pass through the lamp we require a pressure 10 volts . If we have a pressure of 110 volts between wires , and ...
Сторінка 41
... operated rcuits , and at a pressure of either 220 volts being the most common motors upon street cars , which are perated at 500 volts . We may the flow of water to illustrate a circuit in a number of ways . For t we have a large number ...
... operated rcuits , and at a pressure of either 220 volts being the most common motors upon street cars , which are perated at 500 volts . We may the flow of water to illustrate a circuit in a number of ways . For t we have a large number ...
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The National Electrical Code: An Analysis and Explanation of the ... Richard Henry Pierce Повний перегляд - 1896 |
The National Electrical Code. an Analysis and Explanation of the ... Richard H. Pierce,R. E. Richardson Попередній перегляд недоступний - 2015 |
The National Electrical Code: An Analysis and Explanation of the ... Richard Henry Pierce Попередній перегляд недоступний - 2022 |
Загальні терміни та фрази
allowed alternating current amperes arc lamps arc light attached building called carrying capacity ceiling CHAPTER circuit breaker circular mils CLASS cleats CODE COVERED coil conductors connected construction cord cuit device direct current double pole ductors dynamo elec electric light energy exposed floor flow fuse fusible cut-out gas pipe glass or porcelain Gutta Percha hazard heat high potential incandescent lamps inflammable inflammable material inside wiring installed insu insulating covering insulating joint insulating material insulating supports insulation resistance interior conduit liable light and power light or power lightning arrester LOW POTENTIAL SYSTEMS mechanical injury megohm melt metal moisture motors moulding multiple arc non-combustible number of lamps ohms operate opposite polarity ordinary path placed plaster plates potential circuits practice prevent primary battery protected rheostat rubber Rule safe carrying safety secure socket soldered storage battery street railway tion transformer trolley wire underwriters volts Vulca walls
Популярні уривки
Сторінка 133 - 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 211 - The object of a tube or conduit is to facilitate the insertion or extraction of the conductors to protect them from mechanical injury and, as far as possible, from moisture.
Сторінка 209 - 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 all pipes upon which moisture is likely to gather, or which by leaking might cause trouble on a circuit.
Сторінка 73 - Underground Conductors. a. Must be protected against moisture and mechanical injury where brought into a building, and all combustible material must be kept from the immediate vicinity. b. Must not be so arranged as to shunt the current through a building around any catch-box.
Сторінка 19 - Must never be placed in a room where any hazardous process is carried on, nor in places where they would be exposed to inflammable gases, or flyings of combustible material.
Сторінка 47 - VOLTS. Any circuit attached to any machine or combination of machines which develops a difference of potential, between any two wires, of over...
Сторінка 212 - The conductors must not be placed in position until all mechanical work on the building has been, as far as possible, completed. d. Must not be so placed as to be subject to mechanical injury by saws, chisels or nails.
Сторінка 217 - Must each be heavily insulated with a coating of moisture-proof material from the point of entrance to the transformer, and, in addition, must be so covered and protected that mechanical injury to them, or contact with them, shall be practically impossible. b. Must each be furnished, if within a building, with a switch and a fusible cutout where the wires enter the building, or where they leave the main line, on the pole or in the conduit. These switches should be enclosed in secure and fireproof...
Сторінка 209 - ... e. Must be kept free from contact with gas, water or other metallic piping, or any other conductors or conducting material which they may cross, by some continuous and firmly fixed non-conductor, creating a separation of at least one inch.
Сторінка 166 - All conductors connecting with telephone, district messenger, burglar alarm, watch clock, electric time, and other similar instruments, must be provided near the point of entrance to the building with some protective device which will operate to shunt the instruments in case of a dangerous rise of potential, and will open the circuit and arrest an abnormal current flow. Any conductor normally forming an innocuous circuit may become a source of fire hazard if crossed with another conductor, through...