Given a lighting load of 15 kVA in a dwelling. A three-phase system is unbalanced when either the loads or the sources, or both are not same on all three phases. When this occurs, a neutral current exists in wye systems with a neutral, or circulating current exists in delta systems. Power conductors can induce noise onto the communication cables. According to the NEC , demand factor is defined as the ratio of the maximum demand of a system to the total connected load of the system.
Buildings generally have one service for safety reasons, in addition to economics.
PERT and Gantt charts describe the interrelationships between the project tasks and their duration, respectively. They are used to track project progress and to develop and maintain project schedules. In the space below, draw a one-line riser diagram. Include the service entrance, two panels, and three large loads.