AEP Installation Techniques 2 — Questions and Answers
Question 1: When installing underground cable in a trench, what is the minimum burial depth required for cables operating at 600V or less in a residential area per the NEC?
- 6 inches
- 12 inches
- 24 inches (Correct answer)
- 36 inches
Correct answer: 24 inches
NEC Table 300.5 requires a minimum burial depth of 24 inches for cables rated 600V or less in residential branch circuit runs.
Question 2: What is the primary purpose of using a pulling lubricant when installing conductors in conduit?
- To increase conductor insulation resistance
- To reduce friction and prevent damage to conductor insulation (Correct answer)
- To seal the conduit against moisture ingress
- To improve electrical conductivity at splice points
Correct answer: To reduce friction and prevent damage to conductor insulation
Pulling lubricant reduces friction between the conductor insulation and conduit walls, preventing insulation damage during installation.
Question 3: When mounting a transformer on a utility pole, which direction should the primary bushings typically face?
- Toward the street for easy access
- Away from the roadway for safety (Correct answer)
- Upward to allow drainage
- Downward to prevent moisture accumulation
Correct answer: Away from the roadway for safety
Transformer primary bushings are oriented away from roadways to protect personnel from accidental contact and reduce vandalism risk.
Question 4: What tool is used to crimp compression connectors onto aluminum conductors during overhead line installation?
- Hydraulic press crimper (Correct answer)
- Hammer and punch set
- Wire rope clip applicator
- Torque multiplier wrench
Correct answer: Hydraulic press crimper
A hydraulic press crimper applies consistent, high compression force to properly bond compression connectors to aluminum conductors.
Question 5: When installing a new service entrance, where must the service entrance conductors be spliced or connected?
- At the meter base only
- Only at the main breaker panel
- At the service head (weatherhead) drip loops
- They must not be spliced between the service head and the main disconnect (Correct answer)
Correct answer: They must not be spliced between the service head and the main disconnect
NEC 230.46 prohibits splicing service entrance conductors between the service head and the service disconnect except where splicing devices listed for that purpose are used.
Question 6: What is the correct method for installing a dead-end insulator on a transmission line?
- Attach directly to the pole with a lag bolt
- Use a clevis and tongue connection through the cross-arm (Correct answer)
- String it in-line using the same hardware as suspension insulators
- Bolt it horizontally to the pole band
Correct answer: Use a clevis and tongue connection through the cross-arm
Dead-end insulators handle horizontal mechanical tension and are connected through the cross-arm using clevis and tongue hardware designed for strain loading.
Question 7: When installing pad-mounted switchgear, what is the required minimum working clearance in front of the equipment per NESC and OSHA standards?
- 18 inches
- 36 inches
- 48 inches (Correct answer)
- 60 inches
Correct answer: 48 inches
Pad-mounted switchgear requires a minimum 48-inch working clearance in front of the equipment to allow safe operation and maintenance.
AEP Installation Techniques 2
When installing underground cable in a trench, what is the minimum burial depth required for cables operating at 600V or less in a residential area per the NEC?