Download book Cyclopedia of Fire Prevention and Insurance Volume 3; A General Reference Work
Download book Cyclopedia of Fire Prevention and Insurance Volume 3; A General Reference Work
Cyclopedia of Fire Prevention and Insurance Volume 3; A General Reference Work by American School
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Author: American School
Number of Pages: 150 pages
Published Date: 01 Mar 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781130279740
File Name: Cyclopedia.of.Fire.Prevention.and.Insurance.Volume.3;.A.General.Reference.Work.pdf
Download Link: Cyclopedia of Fire Prevention and Insurance Volume 3; A General Reference Work
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1912 Excerpt: ...supply transformers the secondary wiring must be installed as high-potential circuits (550 to 3,500 volts) unless the primaries are installed in complete compliance with the rules governing outside work on constantpotential pole lines over 5,000 volts or are wholly underground within city, town, and village limits. In concluding the consideration of these higher voltage circuits, it is proper to refer again to the fact that the higher the voltage employed the greater the need of care in installation, upkeep, and operation since the results of accidental arcs are more serious. SIGNALING SYSTEMS Wiring Requirements. The wiring and other devices in the great variety of signal systems now employed in buildings, present as a general rule no hazard except their liability to become crossed either outside or inside buildings with electric light, heat, or power circuits. Such signal systems include telephone, telegraph, district messenger and call bell, fire and burglar alarm, and all similar appliances and circuits. It is seldom that the wires of any of these systems are installed in buildings with the same care as are those for lighting or power, and the insulations employed on signal wires are very generally far inferior to those specified for light and power circuits. Furthermore, since signal systems are usually operated from either primary or secondary (storage) batteries of low voltage and limited current capacity, they may be and commonly are installed with little attention to separation of the wires, either from each other, or from the surfaces, walls, and floors to which they are attached. It follows, therefore, that all care should be taken to prevent light and power wires carrying currents of large capacity and relatively high voltages from coming in con...
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Cyclopedia of Fire Prevention and Insurance Volume 3; A General Reference Work by American School
Author: American School
Number of Pages: 150 pages
Published Date: 01 Mar 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781130279740
File Name: Cyclopedia.of.Fire.Prevention.and.Insurance.Volume.3;.A.General.Reference.Work.pdf
Download Link: Cyclopedia of Fire Prevention and Insurance Volume 3; A General Reference Work
---------------------------------------------------------------
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1912 Excerpt: ...supply transformers the secondary wiring must be installed as high-potential circuits (550 to 3,500 volts) unless the primaries are installed in complete compliance with the rules governing outside work on constantpotential pole lines over 5,000 volts or are wholly underground within city, town, and village limits. In concluding the consideration of these higher voltage circuits, it is proper to refer again to the fact that the higher the voltage employed the greater the need of care in installation, upkeep, and operation since the results of accidental arcs are more serious. SIGNALING SYSTEMS Wiring Requirements. The wiring and other devices in the great variety of signal systems now employed in buildings, present as a general rule no hazard except their liability to become crossed either outside or inside buildings with electric light, heat, or power circuits. Such signal systems include telephone, telegraph, district messenger and call bell, fire and burglar alarm, and all similar appliances and circuits. It is seldom that the wires of any of these systems are installed in buildings with the same care as are those for lighting or power, and the insulations employed on signal wires are very generally far inferior to those specified for light and power circuits. Furthermore, since signal systems are usually operated from either primary or secondary (storage) batteries of low voltage and limited current capacity, they may be and commonly are installed with little attention to separation of the wires, either from each other, or from the surfaces, walls, and floors to which they are attached. It follows, therefore, that all care should be taken to prevent light and power wires carrying currents of large capacity and relatively high voltages from coming in con...
Read online Cyclopedia of Fire Prevention and Insurance Volume 3; A General Reference Work Buy Cyclopedia of Fire Prevention and Insurance Volume 3; A General Reference Work Download and read Cyclopedia of Fire Prevention and Insurance Volume 3; A General Reference Work for pc, mac, kindle, readers Download to iPad/iPhone/iOS, B&N nook Cyclopedia of Fire Prevention and Insurance Volume 3; A General Reference Work ebook, pdf, djvu, epub, mobi, fb2, zip, rar, torrent
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