We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
498 REGULATIONS FOR WIRING [Cn. XIII
fire by the wires coming in contact with inflammable material, the wires are carefully insulated so that the current is kept in the circuit and not allowed to escape by taking short cuts or by going to the ground. Two things are necessary for this: (i) The naked wires must in no case touch each other at any point, for that would make a short circuit. (2) The naked wires must not touch anything which is a conductor.
The wires are insulated by covering them with a coating of rubber, asbestos, silk, etc., that is, some substance which will
FIG. 267. AN ELECTRIC CIRCUIT WITH A DOUBLE GROUND. C D The two poles of the dynamo. G Generator (dynamo). Bl A conductor extending from the circuit near the pole C to the ground
<£')•
B2 A conductor near the pole D extending to the ground (g2).
In this case the current will short-circuit, passing from the point B1 to g1 and from g1 to ga, B2 and back to the dynamo at the pole D instead of passing through the arc lamp (A ) and the rheostat (R) . The single ground is dangerous only in that there is liable to be formed a second ground from some other part of the circuit.
g1, g2 The earth into which the conductors, B1, Bs extend.
A Arc lamp.
R Rheostat.
not serve as a conductor. Where the wire must be uncovered, as at switches, etc., some solid substance like porcelain, slate, hard rubber, glass or some other non-conducting substance is used, for the naked wires to rest against.
REGULATIONS FOR WIRING; PRECAUTIONS § 691. National Electric Code. — To make the wiring and connections of electric apparatus good and safe in every respect, the electrical engineers, architects and fire underwriters have formu