Engine Electrical Systems (Refer to Figure 4.) The following data concerning the installation of an electrical unit is known: current requirements for continuous operation —11 amperes; measured cable length — 45 feet; system voltage — 28 volts (do not exceed 1 volt drop); cable in conduit and bundles. What is the minimum size copper electrical cable that may be selected? a. No. 10. b. No. 12. c. No. 14.