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Electrical Applications 2 by David W. Tyler

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Regulations 23
instruments, relays or similar auxiliary apparatus, if such premises
or part of premises are large enough for a person to enter after the
apparatus is in position.'
Reg. 30. Every substation shall be substantially constructed and
shall be so arranged that no person other than an Authorised person
can obtain access thereto otherwise than by the proper entrance or
can interfere with the apparatus or conductors therein from outside;
and shall be provided with an efficient means of ventilation and be
kept dry.
Reg. 31. Every substation shall be under the control of an Auth-
orised person and none but the Authorised