Final answer:
The line current for a balanced 3-phase, 480-volt delta system with an 80,000-VA total load is approximately 55.56 amperes per phase.
Step-by-step explanation:
To calculate the line current for a 3-phase, 480-volt delta system with an actual 80,000-VA total load, we initially consider that the system is balanced with each phase carrying a 30-kVA load. Since the system is balanced, the total load can be divided evenly among the three phases, resulting in approximately 26.67 kVA per phase (80,000 VA / 3). Given the phase voltage of 480 volts, the line current (I) can be calculated using the formula I = Power/Voltage for each phase.
I = 26,670 VA / 480 V ≈ 55.56 A. Therefore, the line current per phase required to support an 80,000-VA load in this 3-phase system is approximately 55.56 amperes.