Table 2, column 1 allows a #6 wire to be used at 60 amps, if this is for residential. Its common practice to use NMWU cable to feed detached garages from houses. The only restriction on using NMWU in a residence would be rule 30-408(1). Branch circuit conductors having insulation suitable for 90 degrees celsius shall be used for wiring of ceiling outlet boxes on which a luminaire is mounted except for boxes in wet locations where type NMW or NMWU cables are used.
