NHIE Actual Exam (2025) comprehensive questions and
verified answers ( detailed & elaborated) ACTUAL EXAM
2025 TEST!!
Electrical System — Exam Questions
Give 4 examples of damaged wire.
1. Cut or pinched
2. Chewed on by animals
3. Burned wire
4. Brittle or cracked insulation
List 3 methods for securing wire ends.
1. Terminal screws
2. Push-in connectors
3. Solderless connectors
What is meant by "open splice"?
- A connection that is not made inside a junction box
Wire should be _____ inches away from the edge of studs.
- 1 1/4 in.
A grommet is ____________.
a fitting that protects a cable from the sharp edges of steel studs.
Wires should not be run on wall surfaces without ___________.
mechanical protection
What is the problem with running wire across the top of the attic ceiling joists?
- they are not visible and may be stepped on
Abandoned wire should be ____________.
removed.
Describe how knob and tube wiring is visibly different from modern cable.
1. The black and white wires are separate and run in pairs.
2. Ceramic tubes protect the wire as it runs through joists or studs.
3. Ceramic knobs are used where wire changes direction.
Does knob and tube wiring have a ground wire associated with it?
, - No
List 4 common problems with knob and tube wiring.
1. Connections not in boxes
2. Brittle wire, insulation or sheathing
3. Wire buried in insulation
4. Fused neutrals
List 3 common problems found with aluminum wiring.
1. Connectors not compatible with aluminum
2. Non anti-oxidant grease on stranded wires
3. Overheating
How would you identify aluminum wiring?
- Conductor silver colored
- Sheathing usually states ALUMINUM, ALUM, or AL
When was aluminum wiring commonly used?
- From mid 60s to late 70s
What caused the problem? List at least 3 things.
1. Tends to creep out from terminal screws
2. Forms corrosion that is an electrical hazard
3. Softer than copper and easy to damage
4. Some of early material was of low quality and prone to breaking
Where is the anti-oxidant grease typically used?
- On stranded aluminum wires
List 12 common lighting problems found in houses.
1. Damaged or loose
2. Overheating
3. Poor stairway lighting
4. Conventional lights used in wet areas
5. Improper recessed lights
6. Improper closet lighting
7. Isolating links needed on pull chains
How are lights tested?
- Turn them on and off by the switches
verified answers ( detailed & elaborated) ACTUAL EXAM
2025 TEST!!
Electrical System — Exam Questions
Give 4 examples of damaged wire.
1. Cut or pinched
2. Chewed on by animals
3. Burned wire
4. Brittle or cracked insulation
List 3 methods for securing wire ends.
1. Terminal screws
2. Push-in connectors
3. Solderless connectors
What is meant by "open splice"?
- A connection that is not made inside a junction box
Wire should be _____ inches away from the edge of studs.
- 1 1/4 in.
A grommet is ____________.
a fitting that protects a cable from the sharp edges of steel studs.
Wires should not be run on wall surfaces without ___________.
mechanical protection
What is the problem with running wire across the top of the attic ceiling joists?
- they are not visible and may be stepped on
Abandoned wire should be ____________.
removed.
Describe how knob and tube wiring is visibly different from modern cable.
1. The black and white wires are separate and run in pairs.
2. Ceramic tubes protect the wire as it runs through joists or studs.
3. Ceramic knobs are used where wire changes direction.
Does knob and tube wiring have a ground wire associated with it?
, - No
List 4 common problems with knob and tube wiring.
1. Connections not in boxes
2. Brittle wire, insulation or sheathing
3. Wire buried in insulation
4. Fused neutrals
List 3 common problems found with aluminum wiring.
1. Connectors not compatible with aluminum
2. Non anti-oxidant grease on stranded wires
3. Overheating
How would you identify aluminum wiring?
- Conductor silver colored
- Sheathing usually states ALUMINUM, ALUM, or AL
When was aluminum wiring commonly used?
- From mid 60s to late 70s
What caused the problem? List at least 3 things.
1. Tends to creep out from terminal screws
2. Forms corrosion that is an electrical hazard
3. Softer than copper and easy to damage
4. Some of early material was of low quality and prone to breaking
Where is the anti-oxidant grease typically used?
- On stranded aluminum wires
List 12 common lighting problems found in houses.
1. Damaged or loose
2. Overheating
3. Poor stairway lighting
4. Conventional lights used in wet areas
5. Improper recessed lights
6. Improper closet lighting
7. Isolating links needed on pull chains
How are lights tested?
- Turn them on and off by the switches
