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An excerpt from Underground Coal Mine Power Systems, INTERMITTENT DUTY RATING OF TRAILING CABLES, USDoI, Bureau of Mines, Information Circular 8893, pgs 74-81

Federal Bureau of Mines sponsored research conducted at Penn State University and West Virginia University has resulted in recommendations to the Mine Safety and Health Administration (MSHA) concerning the maximum current ratings for trailing cables used at various duty cycles. If approved, the ratings would permit smaller size cables than those presently required by 30 CFR 18, yet would provide equivalent safety when protected by circuit breakers which include overload trip capabilities. Computer and calculator programs for calculating allowable ampacity (current capacity) are presented.

WVU's analysis of the PSU data … provided recommendations for sizing conductors, in the form of equations, nomographs, and a program

The appendix to this paper gives … a BASIC program listing for obtaining tabulated intermittent duty ampacities applicable to 30 CFR 18 appendix I rating tables …

Computer BASIC Program … pg-81 "

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