'Legal and national/international standards' (Energy Engineering, 2018), 'High Voltage Power Network Construction', Chap. 2, pp. 15-32, DOI: 10.1049/PBPO110E_ch2 IET Digital Library, https://digital-library.theiet.org/;jsessionid=174kviuii5hbu.x-iet-live-01content/books/10.1049/pbpo110e_ch2