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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Результати 1-5 із 45
Сторінка 5
... Construction qualizers . Their Uses and How Installed sters , Why Needed and Where to Place 28 to 35 CHAPTER IV . FOR LIGHT AND POWER . PART III . Circuits Multiple - arc Circuits -Al- - Motors 36 to 46 CHAPTER V. NTIAL SYSTEMS - PART I ...
... Construction qualizers . Their Uses and How Installed sters , Why Needed and Where to Place 28 to 35 CHAPTER IV . FOR LIGHT AND POWER . PART III . Circuits Multiple - arc Circuits -Al- - Motors 36 to 46 CHAPTER V. NTIAL SYSTEMS - PART I ...
Сторінка 9
... construction of electrical esentatives of insurance companies . ce agent duly appreciates if he does ate , the hazard that may be caused 1 construction . How to recognize he sees it , and how to avoid it , is , It and often an unsolved ...
... construction of electrical esentatives of insurance companies . ce agent duly appreciates if he does ate , the hazard that may be caused 1 construction . How to recognize he sees it , and how to avoid it , is , It and often an unsolved ...
Сторінка 10
... construction which has a bearing on the question of safety , and it will be Im to do this , as far as is possible , in ordinary age , avoiding technical expressions when we can , hen they cannot be avoided , as must often be the we ...
... construction which has a bearing on the question of safety , and it will be Im to do this , as far as is possible , in ordinary age , avoiding technical expressions when we can , hen they cannot be avoided , as must often be the we ...
Сторінка 20
... construction , let us con- sider how it is that an electrical current can cause a hazard . If a current flows in a wire , we have found that its flow is opposed by something analogous to fric- tion , which we have called resistance ...
... construction , let us con- sider how it is that an electrical current can cause a hazard . If a current flows in a wire , we have found that its flow is opposed by something analogous to fric- tion , which we have called resistance ...
Сторінка 22
... construction is non - conducting when dry , but will conduct the current readily when wet . The enemy of insulation is moisture . Generators . - A dry location is especially necessary for a generator . If moisture condenses upon the ...
... construction is non - conducting when dry , but will conduct the current readily when wet . The enemy of insulation is moisture . Generators . - A dry location is especially necessary for a generator . If moisture condenses upon the ...
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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...