1. After all demand factors have been taken into consideration for an office building, the demand load is determined to be 90,000 VA. Where the building has a 120/240 volt, single-phase electrical system, what MINIMUM size copper conductors with THHW insulation are required for the underground installed ungrounded (phase) service-lateral conductors? 500 kcmil I = Power I = 90,000 VA = 375 amperes Volts 240 volts