The price for the latest version of the IEC 61936-1:2021 PDF ("Power installations exceeding 1 kV AC and 1.5 kV DC - Part 1: AC") varies depending on the authorized distributor, but generally ranges between $350 and $450 USD.
Official copies of the standard are protected by copyright and typically require a purchase. You can obtain the full PDF through these official channels:
Protection Against Hazards: Requirements for fire protection, access control, and mechanical stability of electrical structures. Accessing the IEC 61936-1 PDF
Titled "Power installations exceeding 1 kV a.c. – Part 1: Common rules," this International Electrotechnical Commission (IEC) standard provides the fundamental requirements for the design, erection, and operation of high-voltage electrical systems. Whether you are designing a substation, a wind farm, an industrial plant, or a railway power supply, compliance with IEC 61936-1 is often a non-negotiable requirement.