Deals solely with the condition of steady-state operation of cables at all alternating voltages, and direct voltages up to 5 kV, buried directly in the ground, in ducts, troughs or in steel pipes, as well as cables in air. The term Note: - Appendix A Reference ambient temperatures, and thermal resistivities of soils in various countries. Appendix B Information required from the purchaser for the selection of the appropriate type of cable. Appendix C Digital calculation of quantities given graphically.
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