Ministry of Trade , Industry and Energy , 2021, KEC(Korea Electro-technical Code), No. 2021-509, pp. 26

Minister of Land , Infrastructure and Transport , 2019, Korean Railroad Design Standard Soil Structures(KDS 47 10 25), No. 2019-130, pp. 4-5

Korea Electric Association , 2021, KEC Handbook, pp. 61-62

International Electrotechnical Commission(IEC) , 2011, IEC 60364-5-54(Low-voltage Electrical Installations - Part 5-54:Selection and Erection of Electrical Equipment - Earthing Arrangements and Protective Conductors), No. Edition 3.0, pp. 12, p 31

International Electrotechnical Commission(IEC) , 2010, IEC 62305-3(Protection Against Lightning - Part 3:Physical Damage to Structures and Life Hazard), No. Edition 2.0, pp. 45-46

The British Standards Institution(BSI) , 2015, BS 7430(Code of Practice for Protective Earthing of Electrical Installations), No. Edition 2011+A1:2015, pp. 33, 46-47

American National Standards Institute , 2016, NESC(National Electrical Safety Code), No. 2017 Edition, pp. 63-68

International Electrotechnical Commission(IEC) , 2010, IEC 61936-1(Power Installations Exceeding 1 kV a.c. - Part 1:Common rules), No. Edition 2.0, pp. 85

National Fire Protection Association(NFPA) , 2020, NFPA 70 NEC(National Electrical Code), No. 2020 Edition, pp. 121