OBJECTIVES Electrical Distribution SystemsTERMINAL OBJECTIVE1.0 Given the functional characteristics of an AC power source and the intended load,DESCRIBE the necessary components and the wiring scheme to provide a safe ElectricalDistribution System.ENABLING OBJECTIVES1.1EXPLAIN the following terms as they apply to Electrical Distribution Systems:a. Single (one-line) diagramb. Commercial or utility powerc. Diesel powerd. Failure-free powere. Neutral groundingf. Voltage classg. Protective relaysh. Overlapping protective zones1.2DESCRIBE the protection provided by each of the following:a. Fusesb. Protective relays1.3STATE the purpose of circuit breakers.1.4 Given a simple schematic of a circuit breaker control circuit, DESCRIBE the operationof that breaker during remote operation and automatic tripping.1.5LIST the three most widely-used protective features that may be incorporated into acircuit breaker control circuit.1.6STATE the function of motor controllers.1.7STATE three protective features (overloads) that may be incorporated into a motorcontroller.1.8 Given a simplified drawing of a motor controller, DESCRIBE the operation of that motorcontroller.ES-15 Page vi Rev. 0
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