A three-phase motor (code letter $\mathrm{J}$ ) has a full-load current rating of 40 amperes, and a temperature rise of $40^{\circ} \mathrm{C}\left(104^{\circ} \mathrm{F}\right)$.
a. What is the maximum size of fuses that can be used for branch-circuit protection?
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b. What size of heaters would be used for running overload protection?
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