The calculation of cyclic rating factors and emergency loading for one or more cables laid direct or in ducts

The calculation of cyclic rating factors and emergency loading for one or more cables laid direct or in ducts

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The knowledge of the loss load factor of a load cyclically applied to a cable laid direct in the ground or in a duct, together with the detail of the load current for the six hours prior to maximum core temperature, is shown to be adequate for cyclic-rating-factor calculations. If the loss load factor is known without further calculation, the method is shorter than an earlier one described by the author. The method is extended to deal with short-term emergency loads within accepted temperature limits and with groups of cables carrying diverse cyclic loads.


    1. 1)
      • Goldenberg, H.: `The Calculation of Cyclic Rating Factors for Cables Laid Direct or in Ducts', Monograph No. 203 S, Proceedings I.E.E., October 1956, 104 C, p. 154.
    2. 2)
      • Goldenberg, H.: `A Further Simple Method for the Calculation of Cyclic Rating Factors and Emergency Loading for Cables Laid Direct or in Ducts', Ref. F/T190, E.R.A. Report, 1957.
    3. 3)
      • S. Whitehead , E.E. Hutchings . Current Rating of Cables for Transmission and Distribution. Journal, I.E.E.
    4. 4)
      • F.H. Buller . Thermal Transients on Buried Cables. Transactions of the American I.E.E.
    5. 5)
      • : Ref. F/T12, Supplement to Report, 1925, on the Heating of Buried Cables (E.R.A. Report Ref. F/T15).
    6. 6)
      • (1940) Tables of Sine, Cosine and Exponential Integrals.
    7. 7)
      • Goldenberg, H.: `The Calculation of External Thermal Resistance and Cyclic Rating Factors for Groups of Cables Laid Direct in the Ground or in Ducts', Ref. F/T192, E.R.A.Report, 1957.

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