http://www.legislation.gov.uk/nisr/2012/381/section/11/madeTHE ELECTRICITY SAFETY, QUALITY AND CONTINUITY REGULATIONS (NORTHERN IRELAND) 2012Dangerous animalsElectrical installation and servicingenGovernment Printer for Northern Ireland2014-10-07ELECTRICITY These Regulations replace the Electricity Supply Regulations (Northern Ireland) 1991 (S.R. 1991 No. 536) and the subsequent amendment (S.R. 1993/21). PART 3 11 Every generator and distributor shall, for every substation which they own or operate— a enclose the substation where necessary to prevent, so far as is reasonably practicable, danger or unauthorised access; b enclose any part of the substation, which is open to the air and contains live equipment which is not encased, with a fence or wall not less than 2.4 metres in height to prevent, so far as is reasonably practicable, danger or unauthorised access; c ensure that, so far as is reasonably practicable, there are at all times displayed in relation to the substation— i sufficient safety signs which comply with Schedule 1 and which are of such size and placed in such positions as are necessary to give due warning of such danger as is reasonably foreseeable in the circumstances; ii a notice which is placed in a conspicuous position and which gives the location or identification of the substation, the name of each generator or distributor who owns or operates the substation equipment making up the substation and the telephone number where a suitably qualified person appointed for this purpose by the generator or distributor will be in constant attendance; and iii such other signs, which are of such size and placed in such positions, as are necessary to give due warning of danger having regard to the siting of, the nature of, and the measures taken to ensure the physical security of, the substation equipment; and d take all reasonable precautions to minimise the risk of fire associated with the equipment used in the substation.