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Electrical Applications 2 by David W. Tyler

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22 Regulations
The Area Board has to declare the voltage of the supply to the
consumer and to maintain this within 6 per cent of that value.
The frequency has to be maintained within specified limits. This is
under the control of the Generating Board and except in very rare
circumstances they maintain an average of 50 cycles per second
(hertz) over the day so keeping electric clocks correct.
Both Area and Generating Boards have very strict sets of safety
rules and operate a 'Permit-to-work' system which ensures an
extremely low accident rate.
ELECTRICITY These deal with factory installations and the operation of electrical
(FACTORIES