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16th Edition (reference only) – NOW superseded by the 17th Edition IEE Regulations.
Table 2.1 - Voltage Classification
Extra-low Voltage Not exceeding 50 V ac or 120 V dc
Low-voltage Greater than extra-low voltage but not exceeding
1000 V ac or 1500 V dc between conductors
--600 V ac or --900 V dc from any conductor to earth

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Extracted from The Electricians Guide Fifth Edition
by John Whitfield

Published by EPA Press Click Here to order your Copy.

Click here for list of abbreviations