Electrical 2: Installation of Electrical Services

Describe the essential elements of an alternating current (AC) electrical system. Describe various types of electrical services for commercial and industrial installations. Describe single-phase service connections. Describe wye-connected and delta-connected three-phase services. Describe the function of each part of a typical electric service. Read electrical blueprints and diagrams describing service installations. Explain the role of the National Electrical Code (NEC) in service installations. Calculate and select service entrance equipment. Identify the circuit loads, number of circuits required, and installation requirements for distribution panels. Explain the types and purposes of service grounding. Identify the main difference between installing a single-phase service and installing a three-phase service. Describe considerations associated with installing panelboards. Install a panelboard. Identify various types of safety switches. Install a safety switch. Describe the basic requirements of a maintenance program for electrical panelboards and switches.