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Nhie: Electrical System — Exam Questions And Answers With Verified Solutions Already Passed!!!
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Nhie: Electrical System — Exam Questions And Answers With Verified Solutions Already Passed!!!
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Nhie: Electrical System — ExamQuestions And Answers With Verified
Solutions Already Passed!!!
Service entrance conductors run from the service drop to the service box or service
panel. True of false? - ANSWER✔✔- True
The service size is determined by the amperage and the voltage ratings of the
service. - ANSWER✔✔- True
Is the service drop overhead or underground? - ANSWER✔✔- Overhead
Are service laterals overhead or underground? - ANSWER✔✔- Underground
The drip loop is typically part of the service drop. True or False? - ANSWER✔✔-
False
The wire size for the service drop must be the same as the wire size for the service
entrance conductors. True or False? - ANSWER✔✔- False
How many wires would you typically find in a 240-volt service drop? -
ANSWER✔✔- 3
What would 4 wires mean? - ANSWER✔✔- 3-phase electricity
What would 2 wires usually mean? - ANSWER✔✔- 120 volt service
List 7 common problems with service drops. - ANSWER✔✔1. Overhead wires too
low.
2. Damaged or frayed wires.
3. Trees or vines interfering with wires.
4. Wires too close to doors or windows.
5. Wires not well-secured to the house.
6. Poor connection between service drop and service entrance.
7. Inadequate clearance from roofs.
, List clearances above ground, swimming pools, and roofs. -
ANSWER✔✔Clearances above:
- Roadway 18 ft
- Driveway 12 ft.
- Walkway 10 ft.
- Flat roof 10 ft.
- Sloped roof (e.g., > 4:12) 18 in.
- Low slope roof (e.g., < 4:12) 3 ft.
- Swimming pool 22.5 ft
The service entrance conductors run from the _________ to the ___________. -
ANSWER✔✔- Service drop to service box
All service entrance conductors must be in conduit. True or False? -
ANSWER✔✔- False
All service entrance conductors must be attached above roof level. True or False? -
ANSWER✔✔- False
The drip loop should be as close to the roof as possible. True or False? -
ANSWER✔✔- False
List 10 common problems with service entrance conductors. - ANSWER✔✔1. No
drip loop
2. No mast head
3. Mast head not weather tight.
4. Mast or conduit bent.
5. Mast or conduit rusted.
6. Mast rotted (if wood).
7. Mast conduit or cable not well secured.
8. Mast conduit or cable not weather tight.
9. Conduit or cable not well sealed at house/wall penetration.
10. Cable frayed, damaged, or covered by siding.
List 4 common areas of water penetration into service entrances. - ANSWER✔✔1.
conduit joints
2. mast head
3. roof flashing
4. meter base
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