http://www.legislation.gov.uk/nisr/2012/381/section/18/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 5 18 1 Any part of an overhead line which is not connected with earth and which is not ordinarily accessible shall be supported on insulators or surrounded by insulation. 2 Any part of an overhead line which is not connected with earth and which is ordinarily accessible shall be— a made dead; or b so insulated that it is protected, so far as is reasonably practicable, against mechanical damage or interference; or c adequately protected to prevent danger. 3 Any person responsible for erecting a building or structure which will cause any part of an overhead line which is not connected with earth to become ordinarily accessible shall give reasonable notice to the generator or distributor who owns or operates the overhead line of their intention to erect that building or structure. 4 Any bare conductor not connected with earth, which is part of a low voltage overhead line, shall be situated throughout its length directly above a bare conductor which is connected with earth. 5 An overhead line shall not, so far as is reasonably practicable, come so close to any building, tree or structure as to cause danger. 6 In this regulation the expression “ordinarily accessible” means the overhead line could be reached by hand if any scaffolding, ladder or other construction was erected or placed on, in, against or near to a building or structure.