Home Inspection//Residential Electrical Inspection /Electrical
Inspector/ Electrical {National Electrical Code}
Competency Study Guide
Comprehensive Resource To Help You Ace 2026-2027 Exams
Includes Frequently Tested Questions With ELABORATED 100%
Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!! Current Update!!
1. What determines the amount of electricity (amperage) the wire can carry? -
Correct Answer: Size (diameter)
2. How many wires are there from the street into the house in a 240 volt
system? - Correct Answer: 3 conductors
3. The size of the fuses or breakers at the main disconnect will always tell you
the how much electricity is available to the house? - Correct Answer:
FALSE
4. What is the min. size wire to provide the house with 60 Amp. service? -
Correct Answer: #6 gauge (copper)
5. How is the electrical system in most older homes grounded? - Correct
Answer: To metal water supply piping
6. The ground wire should always be clamped upstream of the water meter? -
Correct Answer: TRUE
,7. How are electrical systems grounded on rural properties where the oil
supply piping into the house is plastic? - Correct Answer: Both ground
rods and metal well casing is used
8. Breakers are safer than fuses, anyhow with fuses should be upgraded to
Breakers. True or false - Correct Answer: False fuses are just as safe as
long as properly maintained and installed
9. Fuses are more prone to be improperly sized and overloaded? True or false
- Correct Answer: TRUE
10.What is/ are the most common reasons for replacement of knob and tube
wiring? - Correct Answer: Breakdown of cloth covering insulation,
buried in thermal insulation, and homeowner splices and repairs are all
common reasons for replacement
11.Name an important Improvement between knob and tube wiring and
modern cable. - Correct Answer: The use of grounding
12.Where are GFCI required in newer homes? - Correct Answer: Ground-
fault circuit indicators are required in new homes in kitchen's, bathrooms,
unfinished basements, Outdoors area Porches, and garages.
13.In most cases, three distribution wires connected to one fuse or breaker is
acceptable? True or false - Correct Answer: FALSE
,14.What is the most common electrical flaw found residential? - Correct
Answer: Over fusing
15.A non grounded receptacle within 6 foot of water should be replaced with?
- Correct Answer: GFCI , GFCI Upstream from receptacle , single pole
GFCI breaker
16.The maximum number of disconnects allowed to shut off main panel are? -
Correct Answer: 6
17.What is the correct size copper wire for a 20 amp breaker? - Correct
Answer: 12 copper wire
18.Non-metallic sheathed cables in an attic on top of joist must be? -
Correct Answer: Both protected within 6 feet of attic ladder , Scuttle hole
and must be fastened every 4 and 1/2 feet
19.What closet lighting is ok? - Correct Answer: Surface mounted or
recessed incandescent fixtures with completely enclosed lamps, recessed
fluorescent fixtures , mounted incandescent fixtures can be mounted on
ceiling with 12 inch clearance
20.Sub panel requirements? - Correct Answer: Neutral and ground must be
separated , must be bonded , must be isolated
, 21.Grounding rod must be driven to what depth for proper protection? -
Correct Answer: 8 feet
22.A fused neutral ( neutral wire runs to a fuse) is considered? - Correct
Answer: Unsafe
23.(True or False) A fused neutral ( neutral wire runs to a fuse) is considered is
safe ? - Correct Answer: False
24.2 conductor wiring can be used with a GFCI? - Correct Answer: TRUE
25.Does a sump pump require a GFCI? - Correct Answer: Not, if it is
attached to a dedicated receptacle or circuit
26.What is the minimum required clearance in front of the main electrical
panel box? - Correct Answer: 30 inches wide X 36 inches front clearance
is required at breaker box
27.AC cable commonly known as BX , contains a bare aluminum wire. What is
its purpose? - Correct Answer: The wire is a bonding wire and should
not be connected or brought into the interior of boxes
28.When a GFCI is installed on a two wire non grounded system it provides? -
Correct Answer: Fault protection, but not grounding protection
Inspector/ Electrical {National Electrical Code}
Competency Study Guide
Comprehensive Resource To Help You Ace 2026-2027 Exams
Includes Frequently Tested Questions With ELABORATED 100%
Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!! Current Update!!
1. What determines the amount of electricity (amperage) the wire can carry? -
Correct Answer: Size (diameter)
2. How many wires are there from the street into the house in a 240 volt
system? - Correct Answer: 3 conductors
3. The size of the fuses or breakers at the main disconnect will always tell you
the how much electricity is available to the house? - Correct Answer:
FALSE
4. What is the min. size wire to provide the house with 60 Amp. service? -
Correct Answer: #6 gauge (copper)
5. How is the electrical system in most older homes grounded? - Correct
Answer: To metal water supply piping
6. The ground wire should always be clamped upstream of the water meter? -
Correct Answer: TRUE
,7. How are electrical systems grounded on rural properties where the oil
supply piping into the house is plastic? - Correct Answer: Both ground
rods and metal well casing is used
8. Breakers are safer than fuses, anyhow with fuses should be upgraded to
Breakers. True or false - Correct Answer: False fuses are just as safe as
long as properly maintained and installed
9. Fuses are more prone to be improperly sized and overloaded? True or false
- Correct Answer: TRUE
10.What is/ are the most common reasons for replacement of knob and tube
wiring? - Correct Answer: Breakdown of cloth covering insulation,
buried in thermal insulation, and homeowner splices and repairs are all
common reasons for replacement
11.Name an important Improvement between knob and tube wiring and
modern cable. - Correct Answer: The use of grounding
12.Where are GFCI required in newer homes? - Correct Answer: Ground-
fault circuit indicators are required in new homes in kitchen's, bathrooms,
unfinished basements, Outdoors area Porches, and garages.
13.In most cases, three distribution wires connected to one fuse or breaker is
acceptable? True or false - Correct Answer: FALSE
,14.What is the most common electrical flaw found residential? - Correct
Answer: Over fusing
15.A non grounded receptacle within 6 foot of water should be replaced with?
- Correct Answer: GFCI , GFCI Upstream from receptacle , single pole
GFCI breaker
16.The maximum number of disconnects allowed to shut off main panel are? -
Correct Answer: 6
17.What is the correct size copper wire for a 20 amp breaker? - Correct
Answer: 12 copper wire
18.Non-metallic sheathed cables in an attic on top of joist must be? -
Correct Answer: Both protected within 6 feet of attic ladder , Scuttle hole
and must be fastened every 4 and 1/2 feet
19.What closet lighting is ok? - Correct Answer: Surface mounted or
recessed incandescent fixtures with completely enclosed lamps, recessed
fluorescent fixtures , mounted incandescent fixtures can be mounted on
ceiling with 12 inch clearance
20.Sub panel requirements? - Correct Answer: Neutral and ground must be
separated , must be bonded , must be isolated
, 21.Grounding rod must be driven to what depth for proper protection? -
Correct Answer: 8 feet
22.A fused neutral ( neutral wire runs to a fuse) is considered? - Correct
Answer: Unsafe
23.(True or False) A fused neutral ( neutral wire runs to a fuse) is considered is
safe ? - Correct Answer: False
24.2 conductor wiring can be used with a GFCI? - Correct Answer: TRUE
25.Does a sump pump require a GFCI? - Correct Answer: Not, if it is
attached to a dedicated receptacle or circuit
26.What is the minimum required clearance in front of the main electrical
panel box? - Correct Answer: 30 inches wide X 36 inches front clearance
is required at breaker box
27.AC cable commonly known as BX , contains a bare aluminum wire. What is
its purpose? - Correct Answer: The wire is a bonding wire and should
not be connected or brought into the interior of boxes
28.When a GFCI is installed on a two wire non grounded system it provides? -
Correct Answer: Fault protection, but not grounding protection
