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 20
Сторінка 22
... earth and the conductors on the machine may be destroyed , thus endangering both dynamo and circuits . Further , where machines of very high E. M. F. are used , a damp floor or poorly insulated machine may endanger the life of the 22 ...
... earth and the conductors on the machine may be destroyed , thus endangering both dynamo and circuits . Further , where machines of very high E. M. F. are used , a damp floor or poorly insulated machine may endanger the life of the 22 ...
Сторінка 23
... earth . This contact is called a " ground . " It is common usage to speak of the contact of a wire with any con- ducting substance as a " ground , " and when we have such a contact , we say that the wire is grounded upon the substance ...
... earth . This contact is called a " ground . " It is common usage to speak of the contact of a wire with any con- ducting substance as a " ground , " and when we have such a contact , we say that the wire is grounded upon the substance ...
Сторінка 32
... earth , and a lightning arrester is a device intended to assist the lightning to get to the earth by an easy path , and thus prevent it from taking a path where it might cause fire or other damage . A lightning dis- charge has a ...
... earth , and a lightning arrester is a device intended to assist the lightning to get to the earth by an easy path , and thus prevent it from taking a path where it might cause fire or other damage . A lightning dis- charge has a ...
Сторінка 34
... earth outside of the station than to invite it inside and then attempt to direct its movements . Whether we have lightning arresters on our switch board or not , we should have them on our overhead line , and if we can get arresters ...
... earth outside of the station than to invite it inside and then attempt to direct its movements . Whether we have lightning arresters on our switch board or not , we should have them on our overhead line , and if we can get arresters ...
Сторінка 36
... earth , abnor- mal in view of the potential and method of operation . b . All multiple arc low potential systems ( 300 volts or less ) must be pro- vided with an indicating or detecting device , readily attachable , to afford easy means ...
... earth , abnor- mal in view of the potential and method of operation . b . All multiple arc low potential systems ( 300 volts or less ) must be pro- vided with an indicating or detecting device , readily attachable , to afford easy means ...
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Загальні терміни та фрази
allowed alternating current amperes approved insulating arc lamp arc light attached building called carbons ceiling Central Station CHAPTER circular mils CLASS CODE COVERED coil combination fixture combustible material concealed conductors connected construction cord cuit damp direct current double pole ductors dynamo earth elec electric light energy exposed floor flow fuse fusible cut-out gas pipe glass or porcelain globe ground hazard heat incandescent lamps inch in thickness inflammable material inside installed insu insulating covering insulating joint insulating material insulating supports insulating tubes insulation resistance liable light and power light or power lightning arrester LOW POTENTIAL SYSTEMS mechanical injury megohm metal moisture moulding multiple arc number of lamps ohms operate opposite polarity ordinary path placed plates practice prevent primary battery protected rheostat rubber Rule secure shunt socket soldered spark arrester splices switch board tion transformer tricity trolley wire underwriters volts Vulca walls