MSHA-75.601-3
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MSHA - Title 30 CFR
30 CFR § 75.601-3
Short circuit protection; dual element fuses; current ratings; maximum values.
Dual element fuses having adequate current-interrupting capacity shall meet the requirements for short circuit protection of trailing cables as provided in §75.601, however, the current ratings of such devices shall not exceed the maximum values specified in this section:
        ---------------------+------------------+------------------
                             | Single conductor |   Two conductor
                             |      cable       |       cable
         Conductor size (AWG |---------|----------|---------|----------
              or MGM)        |        |  Max.   |        |   Max.
                             |  Ampa- |  fuse   |  Ampa- |   fuse
                             |  city  | rating  |  city  |  rating
        ---------------------+--------+---------+--------+---------
         14..................|........|.........|   15   |    15
         12..................|........|.........|   20   |    20
         10..................|........|.........|   25   |    25
         8...................|    60  |    60   |   50   |    50
         6...................|    85  |    90   |   65   |    70
         4...................|   110  |   110   |   90   |    90
         3...................|   130  |   150   |  105   |   110
         2...................|   150  |   150   |  120   |   125
         1...................|   170  |   175   |  140   |   150
         1/0.................|   200  |   200   |  170   |   175
         2/0.................|   235  |   250   |  195   |   200
         3/0.................|   275  |   300   |  225   |   225
         4/0.................|   315  |   350   |  260   |   300
         250.................|   350  |   350   |  285   |   300
         300.................|   395  |   400   |  310   |   350
         350.................|   445  |   450   |  335   |   350
         400.................|   480  |   500   |  360   |   400
         450.................|   515  |   600   |  385   |   400
         500.................|   545  |   600   |  415   |   450
        ---------------------+--------+---------+--------+---------