PECO Distribution Systems & Infrastructure 3

Question 1

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

Accepted Answer

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

Answer

Protect the feeder against lightning surges

Answer

Detect and clear ground faults

Answer

Measure real and reactive power flow

Question 2

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

Accepted Answer

114V to 126V

Answer

108V to 132V

Answer

110V to 130V

Answer

117V to 123V

Question 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:

Accepted Answer

100 feet

Answer

50 feet

Answer

150 feet

Answer

200 feet

Question 4

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

Accepted Answer

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

Answer

Both legs drop to zero volts, causing a complete outage

Answer

Only 120V circuits are affected; 240V appliances continue to operate normally

Answer

The service becomes three-phase automatically

Question 5

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

Accepted Answer

NESC (IEEE C2)

Answer

NEC (NFPA 70)

Answer

OSHA 1910.269

Answer

NERC CIP Standards

Question 6

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

Accepted Answer

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

Answer

Manual field crew radio communication only

Answer

Customer AMI meter ping-back system

Answer

Fiber optic thermal monitoring sensors

Question 7

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

Accepted Answer

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

Answer

To increase the cable's current-carrying capacity

Answer

To allow higher operating voltages than overhead lines

Answer

To reduce cable weight for easier installation