Sharpsteen's lessons in electricity for beginners by Sharpsteen

Author:Sharpsteen, [Alice A.] [from old catalog]
Language: eng
Format: epub, pdf
Tags: Electricity
Publisher: Binghamton, N.Y., A. A. Sharpsteen
Published: 1895-03-25T05:00:00+00:00

is not very large, or the wire is to start from the switchboard or very near it, three per cent drop is all right with the average load, but when the source of the current is far away and there has got to be some loss in the mains and transformers, the house wiring should not have much drop for good work.

88.—It is a common thing to find a difference of ten per cent in the voltage between one lamp on and all lamps on in buildings lighted either by central stations or isolated plants. This is a very bad state of things, and should always be avoided for permanent work.

89.—If one gets Ohm's law well fixed in his mind it is an easy thing, with the use of a proper wire table, to determine the wire sizes for any distance and any number of lamps.

90.—A person should always know the drop or loss of voltage before he commences to compute the sizes of wire for a job.

91.—Examples:

A section of a factory is to be wired for 18 lamps; the middle of the room or section is, along the paths the wires must take, about 100 feet from the switchboard or machine, drop three volts, voltage 1 10, lamps will take about y 2 ampere each.

If a wiring table is handy it will be found that about No. 12 H. & S. gauge is the size, and No. 12 has a resistance of 1.5 ohms to the thousand feet; 200 feet, or 100 feet each way, would be % of a thousand ;

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