Answer Posted / tejeswara rao paidi

The earthing requirements for a high tension (HT) 22 kV cable, lighting arrestor, disconnecting switch (D.O.), and air break (A.B.) switch are governed by specific standards and guidelines.

In India, the **IS: 3043 - 1987** standard provides the **Code of Practice for Earthing**¹. This standard outlines the general principles and detailed methodologies for designing and implementing earthing systems for electrical installations. It includes factors such as the resistance of the electrode, contact resistance between the electrode and the soil, and the resistance of the soil from the electrode surface outward¹.

For specific equipment like a 22 kV cable, the guidelines for use of underground cable systems and overhead conductor systems by the Central Electricity Authority could be referred².

However, the exact earthing requirements can vary based on factors such as the type of installation, soil resistivity, fault current levels, and safety considerations. Therefore, it's recommended to consult with a qualified electrical engineer or the relevant electrical authority for the specific earthing requirements for your installation.

Please note that this information is based on general guidelines and standards, and may not be applicable in all situations or jurisdictions. Always consult with a qualified professional or the relevant authorities for specific advice.

Source: Conversation with Bing, 28/1/2024
(1) Indian Standard: CODE OF PRACTICE FOR EARTHING - Law.Resource.Org. https://law.resource.org/pub/in/bis/S05/is.3043.1987.html.
(2) GUIDELINES FOR USE OF UNDER GROUND CABLE SYSTEM AND OVERHEAD CONDUCTOR .... https://cea.nic.in/wp-content/uploads/2020/04/b.pdf.
(3) MATERIAL SPECIFICATIONS CELL - महावितरण. https://www.mahadiscom.in/supplier/wp-content/uploads/2020/01/Metering-Cubicle-1122-kV33kV-29.08.2019-FINAL.pdf.
(4) TECHNICAL SPECIFICATION FOR XLPE POWER CABLE - महावितरण. https://www.mahadiscom.in/supplier/wp-content/uploads/2018/08/HTXLPESPEC2006.pdf.
(5) TECHNICAL SPECIFICATION FOR 33/132/220 KV H.T. XLPE POWER CABLE - OPTCL. https://optcl.co.in/writereaddata/Tender/150619110614E31-33-132-220KV_XLPE_CABLE_SPEC_12042019.pdf.
if any doubts regarding technicality refer the url mentioned

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