Abstract
Electricity supplies for distribution through the National Grid are high voltage supplies: 400,000, 275,000 or 132,000 volts (400, 275 or 132 kV). These voltages are reduced by stepdown transformers to 11,000 and 6000 volts at sub-stations, but even at this reduced rate the supplies are too large for most buildings. Local transformers bring further reductions to 415/240 volt supplies which have three phases (or live conductors) and a neutral.
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References
The Institution of Electrical Engineers, Regulations for the Electrical Equipment of Buildings.
BS 4746: 1984 PVC insulation and the sheath of electric cables.
BS 842: 1965 (1980) AC voltage operated earth leakage circuit breakers.
BS 3456 Specification for safety of household and similar electrical appliances.
BS 5486: Parts 1, 2, 11, 12 and 13 Specification for factory built assemblies of switchgear and control gear for voltages up to and including 1000 v ac and 1200 v dc.
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© 1988 Christopher Anthony Howard
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Howard, C.A. (1988). Electrical Installations. In: An Introduction to Building Services. Macmillan Building and Surveying Series. Palgrave, London. https://doi.org/10.1007/978-1-349-09259-8_7
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DOI: https://doi.org/10.1007/978-1-349-09259-8_7
Publisher Name: Palgrave, London
Print ISBN: 978-0-333-43462-8
Online ISBN: 978-1-349-09259-8
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