NHIE: Electrical System Exam Questions with all Correct &
100% Verified Answers |Actual Complete Update |
Already Graded A+
Service entrance conductors run from the service drop to the service box or service panel. True
of false? ✔Correct Answer-- True
The service size is determined by the amperage and the voltage ratings of the service.
✔Correct Answer-- True
Is the service drop overhead or underground? ✔Correct Answer-- Overhead
Are service laterals overhead or underground? ✔Correct Answer-- Underground
The drip loop is typically part of the service drop. True or False? ✔Correct 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? ✔Correct Answer-- False
How many wires would you typically find in a 240-volt service drop? ✔Correct Answer-- 3
What would 4 wires mean? ✔Correct Answer-- 3-phase electricity
What would 2 wires usually mean? ✔Correct Answer-- 120 volt service
List 7 common problems with service drops. ✔Correct 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. ✔Correct 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 ___________. ✔Correct
Answer-- Service drop to service box
All service entrance conductors must be in conduit. True or False? ✔Correct Answer-- False
All service entrance conductors must be attached above roof level. True or False? ✔Correct
Answer-- False
The drip loop should be as close to the roof as possible. True or False? ✔Correct Answer--
False
List 10 common problems with service entrance conductors. ✔Correct 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. ✔Correct Answer-1. conduit
joints
2. mast head
3. roof flashing
4. meter base
5. house entry
List 2 functions of the drip loop. ✔Correct Answer-1. Prevents water entry into the conduit or
service entrance conductors.
2. Shows that the service drop wires are not straining the splices.
Roughly 999 out of 1000 houses have _________ volts available. ✔Correct Answer-- 240 volts
Roughly 999 out of 1000 houses have __________ service entrance wires. ✔Correct Answer--
3 service entrance wires
Load calculations are part of a home inspection. ✔Correct Answer-- False
Implications of an undersized service include:
a. shock hazard
100% Verified Answers |Actual Complete Update |
Already Graded A+
Service entrance conductors run from the service drop to the service box or service panel. True
of false? ✔Correct Answer-- True
The service size is determined by the amperage and the voltage ratings of the service.
✔Correct Answer-- True
Is the service drop overhead or underground? ✔Correct Answer-- Overhead
Are service laterals overhead or underground? ✔Correct Answer-- Underground
The drip loop is typically part of the service drop. True or False? ✔Correct 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? ✔Correct Answer-- False
How many wires would you typically find in a 240-volt service drop? ✔Correct Answer-- 3
What would 4 wires mean? ✔Correct Answer-- 3-phase electricity
What would 2 wires usually mean? ✔Correct Answer-- 120 volt service
List 7 common problems with service drops. ✔Correct 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. ✔Correct 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 ___________. ✔Correct
Answer-- Service drop to service box
All service entrance conductors must be in conduit. True or False? ✔Correct Answer-- False
All service entrance conductors must be attached above roof level. True or False? ✔Correct
Answer-- False
The drip loop should be as close to the roof as possible. True or False? ✔Correct Answer--
False
List 10 common problems with service entrance conductors. ✔Correct 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. ✔Correct Answer-1. conduit
joints
2. mast head
3. roof flashing
4. meter base
5. house entry
List 2 functions of the drip loop. ✔Correct Answer-1. Prevents water entry into the conduit or
service entrance conductors.
2. Shows that the service drop wires are not straining the splices.
Roughly 999 out of 1000 houses have _________ volts available. ✔Correct Answer-- 240 volts
Roughly 999 out of 1000 houses have __________ service entrance wires. ✔Correct Answer--
3 service entrance wires
Load calculations are part of a home inspection. ✔Correct Answer-- False
Implications of an undersized service include:
a. shock hazard
