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Distribution Systems & Infrastructure Flashcards

7 cards from real PECO practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. What is the purpose of a voltage regulator installed on a PECO distribution feeder?

    Answer: Automatically adjust voltage to keep it within acceptable limits along the feeder length

    A voltage regulator is an autotransformer with a tap changer that automatically adjusts its ratio to maintain feeder voltage within ANSI C84.1 limits despite varying load conditions.

  2. According to ANSI C84.1, the preferred service voltage range (Range A) for PECO's 120V secondary system is:

    Answer: 114V to 126V

    ANSI C84.1 Range A for 120V nominal service specifies a preferred voltage range of 114V to 126V (±5%) at the utilization point under normal operating conditions.

  3. When a PECO lineman installs a new service drop from a secondary distribution line to a residential meter, the maximum allowed service drop conductor span without additional support is typically:

    Answer: 100 feet

    PECO construction standards and the National Electrical Safety Code (NESC) generally allow a maximum service drop span of approximately 100 feet without intermediate support for residential services.

  4. What does 'loss of neutral' on a 120/240V residential service typically cause?

    Answer: An imbalanced voltage condition where loads on one leg see over-voltage and loads on the other see under-voltage

    Without a neutral, the two 120V legs become a series circuit across 240V; unbalanced loads cause voltage to redistribute so one side rises above 120V while the other drops below, potentially damaging appliances.

  5. Which document governs the minimum safety requirements for the construction of overhead and underground electric supply lines in PECO's distribution system?

    Answer: NESC (IEEE C2)

    The National Electrical Safety Code (NESC / IEEE C2) sets minimum safety requirements for electric supply and communication lines and equipment, including PECO's overhead and underground distribution construction.

  6. PECO's distribution automation (DA) system uses which technology to remotely monitor and switch feeder sections during an outage?

    Answer: SCADA (Supervisory Control and Data Acquisition) integrated with automated switches

    PECO's distribution automation uses SCADA integrated with remote-controlled automated switches and reclosers to enable operators to locate faults, isolate sections, and restore service remotely.

  7. What is the primary reason PECO uses underground distribution cable with concentric neutral conductors?

    Answer: To provide a return current path and shielding that reduces electric field exposure and improves safety

    Concentric neutrals wrapped around the insulation serve as both the grounded return current path and an electrostatic shield, confining the electric field within the cable and improving personnel safety.