File:Electrical news and engineering (1911) (14589793329).jpg

Identifier: electricalnewsen20donm (find matches)
Title: Electrical news and engineering
Year: 1891 (1890s)
Authors:
Subjects: Electrical engineering
Publisher: Don Mills, Ont. (etc.) Southam-Maclean Publications
Contributing Library: Engineering - University of Toronto
Digitizing Sponsor: University of Toronto

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illuminationthat leaves little to be desired. The former practice also of operating these low voltagelamps in series on a no or higher, volt circuit though ingeneral satisfactory, is gradually being superceded by asimpler arrangement whereby a small transformer, placedinside the house, cuts the service voltage down to one-halfor one-third or one-quarter, as may be required, of theleading in voltage so that the house service wires whichordinarily carry (say) no volts will now carry 55 or 34 or27^, depending on the type of lamp the consumer decidesto use. A very successful low voltage lighting installation hasjust been completed in the Royal Cecil Apartments onJarvis street, Toronto, a building comprising some fortyodd single living rooms, in addition to public sitting rooms,music room, dining rooms, barber shop, kitchen, etc. Fig. 2—Small low voltage Balancing Transformer higher powers, for small rooms especially, has been theirown undoing and they are now gradually sharing the field
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Pig. 3—Four 15 watt haiiipaelectrolier for living room liig. 4—Five unit fixturein music room The accompanying diagram indicates the wiring planinside the building. The load on leaving the meter is dis-tributed as nearly as possible into two equal parts. Eachsection being regulated by a small balancing transformerfrom which a three-wire system differing in pressure byabout 57 volts, as shown, serves the various rooms. The consumption of these transformers is very small, CANADIAN ELECTRICAIj NEWS 57 representing only in either case the difference between theloads on the two sides of the 3-wire system. When theload is exactly balanced no current whatever passesthrough the transformer. The distribution of the load will be understood by fur-ther reference to the diagram. Lines A feed the apartments section with 220-15 watt57 volt lamps having a total consumption of 3300 watts. B serves the halls with 30-15 watt units; C is the barbershop section with 20-15 watt units; D is dining room

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