AEP Installation Techniques 3 — Questions and Answers
Question 1: When installing aerial bundled cable (ABC) on a distribution system, what type of support hardware is used to attach the cable to the pole?
- Standard suspension clamps without insulation
- Insulated suspension clamps with messenger support (Correct answer)
- Bare aluminum tie wires
- Fiberglass cross-arm bolts
Correct answer: Insulated suspension clamps with messenger support
Aerial bundled cable uses insulated suspension clamps that support the integral messenger strand while maintaining the insulation system.
Question 2: What is the minimum horizontal distance that primary distribution conductors must maintain from a building's window or door per NESC rules?
- 1 foot
- 3 feet (Correct answer)
- 6 feet
- 10 feet
Correct answer: 3 feet
NESC Rule 234 requires primary conductors to maintain at least 3 feet of horizontal clearance from windows, doors, and other building openings.
Question 3: During installation of a new overhead line, what is the purpose of sagging conductors before final clamping?
- To test insulation resistance before energizing
- To set the correct conductor tension and clearance at design temperature (Correct answer)
- To identify damaged sections of conductor
- To allow visual inspection of splices
Correct answer: To set the correct conductor tension and clearance at design temperature
Sagging sets the conductor to the design tension so that ground clearance and mechanical loads remain within specified limits across the full temperature range.
Question 4: When making a bolted joint on a copper bus bar, what must be applied between the mating surfaces?
- Electrical tape for insulation
- Anti-oxidant joint compound (Correct answer)
- Thread-locking adhesive
- Silicone grease sealant
Correct answer: Anti-oxidant joint compound
Anti-oxidant joint compound prevents oxidation on copper contact surfaces, ensuring low-resistance, reliable electrical connections.
Question 5: What is the correct bend radius for rigid metallic conduit (RMC) during installation to prevent conductor damage?
- At least 4 times the conduit inside diameter
- At least 6 times the conduit trade size (Correct answer)
- At least 10 times the conduit inside diameter
- At least 3 times the conduit outside diameter
Correct answer: At least 6 times the conduit trade size
NEC 344.24 requires bends in RMC to have a radius of not less than 6 times the conduit trade size to prevent conductor insulation damage.
Question 6: When installing a self-healing capacitor bank on a distribution feeder, what grounding practice is required?
- Float the capacitor neutral ungrounded
- Ground the capacitor bank frame and neutral to the system neutral (Correct answer)
- Ground only the frame, leaving the neutral isolated
- Bond the neutral to the secondary service neutral only
Correct answer: Ground the capacitor bank frame and neutral to the system neutral
Both the capacitor bank frame and the capacitor neutral must be grounded to the system neutral to ensure proper fault protection and overvoltage control.
Question 7: What technique is used to prevent moisture from entering a splice in a direct-buried cable installation?
- Coating the splice with electrical tape only
- Using a heat-shrink or resin-filled splice kit rated for direct burial (Correct answer)
- Wrapping the splice in plastic sheeting
- Applying roofing tar around the splice connection
Correct answer: Using a heat-shrink or resin-filled splice kit rated for direct burial
Heat-shrink or resin-filled splice kits create a waterproof, mechanically strong seal specifically rated for direct-buried applications.
AEP Installation Techniques 3
When installing aerial bundled cable (ABC) on a distribution system, what type of support hardware is used to attach the cable to the pole?