Module 11 - Residential Electrical Services Questions and
Answers 2023 with complete solution
A small residence has a floor area of 900 square feet. What is its general lighting
load?
2,700VA
Per NEC Table 220.54, a household with two dryers has a demand factor of
__________.
100%
If a dwelling has two kitchen areas, then the total small appliance branch circuits
required would be __________.
four at 1,500VA each
A lighting load of 2,700VA at 120V has an amperage of __________.
22.5A
When used as a grounding electrode, a ground ring must be at least __________.
20' (6.0 m) long
When a screw is used as a main bonding jumper, it must be colored __________.
green
Information on equipment grounding for computers is found in __________.
NEC Section 250.114
Per NEC Section 230.24(B), if the service conductors pass over residential
property and driveways or commercial property that is not subject to truck traffic,
the conductors must be at least __________.
15' (4.5 m) above the ground
A residence has conductors installed under a 1" (25 mm) slab. According to NEC
Section 230.6, these conductors are considered __________.
inside the house, and a disconnect is required at the meter base
In three-wire NM cable, the color code of the conductors is __________.
black, white, and red, with a bare or green grounding conductor
Which of the following areas of a residence would most likely use conductors run
in conduit?
unfinished basements
A branch circuit that supplies a storage-type water heater with a capacity of 120
gallons (450 L) or less and a nameplate rating of 20A must be rated at a minimum
of __________.
25A
A branch circuit for lighting has a capacity of 1,800VA. It should be loaded to no
more than __________.
1,440VA
A metallic outlet box for two No. 12 AWG conductors with a ground wire, cable
clamp, a switch, and a looped conductor over 12" (300 mm) would count as
__________.
eight conductors
The brass screw on a receptacle connects to the __________.
ungrounded conductor
, The correct operation of a four-way switch requires at least __________.
two three-way switches
When installing a hot tub, at least one GFCI-protected receptacle must be located
no more than __________.
10' (3.0 m) away from the inside wall of the hot tub
The minimum number of small appliance circuits required by the NEC in a kitchen
area is _____.
2
When sizing electrical services, at which percentage is the first 3,000VA is rated
at __________.
100%
According to NEC Section 220.53, a demand factor of 75% may be applied to
__________.
fixed appliance loads
The minimum service disconnecting means for a one-family dwelling is
__________.
100A
The general lighting load in a residence is 3,600VA at 120V. What is the
amperage?
30A
A single-pole GFCI breaker is rated at __________.
120VAC
Exposed noncurrent-carrying metal parts of fixed equipment must be grounded if
the equipment operates with any terminal over
150V to ground
Service drop conductors must be located at a minimum height of __________.
10' above the ground or other accessible surface
Which section of the NEC requires that fittings be identified for use with service
masts?
NEC Section 230.28
Above a window that can be opened, the clearance of a service conductor without
an overall jacket must be not less than __________.
3' (900 mm)
NEC Section 230.6 considers conductors to be outside the building when
installed under at least __________.
2" (50 mm) of concrete
Type NM cable may not be used in __________.
shallow chases of masonry, concrete, or adobe
Type MC cable may NOT be used __________.
where subject to physical damage
Type SE cable is available with _________ for interior wiring systems.
an insulated grounded conductor
Type SER cable may be used ________.
as a subfeed under certain conditions
Conductors used for electric water heaters must be sized at __________.
125% of the heater's nameplate rating
Answers 2023 with complete solution
A small residence has a floor area of 900 square feet. What is its general lighting
load?
2,700VA
Per NEC Table 220.54, a household with two dryers has a demand factor of
__________.
100%
If a dwelling has two kitchen areas, then the total small appliance branch circuits
required would be __________.
four at 1,500VA each
A lighting load of 2,700VA at 120V has an amperage of __________.
22.5A
When used as a grounding electrode, a ground ring must be at least __________.
20' (6.0 m) long
When a screw is used as a main bonding jumper, it must be colored __________.
green
Information on equipment grounding for computers is found in __________.
NEC Section 250.114
Per NEC Section 230.24(B), if the service conductors pass over residential
property and driveways or commercial property that is not subject to truck traffic,
the conductors must be at least __________.
15' (4.5 m) above the ground
A residence has conductors installed under a 1" (25 mm) slab. According to NEC
Section 230.6, these conductors are considered __________.
inside the house, and a disconnect is required at the meter base
In three-wire NM cable, the color code of the conductors is __________.
black, white, and red, with a bare or green grounding conductor
Which of the following areas of a residence would most likely use conductors run
in conduit?
unfinished basements
A branch circuit that supplies a storage-type water heater with a capacity of 120
gallons (450 L) or less and a nameplate rating of 20A must be rated at a minimum
of __________.
25A
A branch circuit for lighting has a capacity of 1,800VA. It should be loaded to no
more than __________.
1,440VA
A metallic outlet box for two No. 12 AWG conductors with a ground wire, cable
clamp, a switch, and a looped conductor over 12" (300 mm) would count as
__________.
eight conductors
The brass screw on a receptacle connects to the __________.
ungrounded conductor
, The correct operation of a four-way switch requires at least __________.
two three-way switches
When installing a hot tub, at least one GFCI-protected receptacle must be located
no more than __________.
10' (3.0 m) away from the inside wall of the hot tub
The minimum number of small appliance circuits required by the NEC in a kitchen
area is _____.
2
When sizing electrical services, at which percentage is the first 3,000VA is rated
at __________.
100%
According to NEC Section 220.53, a demand factor of 75% may be applied to
__________.
fixed appliance loads
The minimum service disconnecting means for a one-family dwelling is
__________.
100A
The general lighting load in a residence is 3,600VA at 120V. What is the
amperage?
30A
A single-pole GFCI breaker is rated at __________.
120VAC
Exposed noncurrent-carrying metal parts of fixed equipment must be grounded if
the equipment operates with any terminal over
150V to ground
Service drop conductors must be located at a minimum height of __________.
10' above the ground or other accessible surface
Which section of the NEC requires that fittings be identified for use with service
masts?
NEC Section 230.28
Above a window that can be opened, the clearance of a service conductor without
an overall jacket must be not less than __________.
3' (900 mm)
NEC Section 230.6 considers conductors to be outside the building when
installed under at least __________.
2" (50 mm) of concrete
Type NM cable may not be used in __________.
shallow chases of masonry, concrete, or adobe
Type MC cable may NOT be used __________.
where subject to physical damage
Type SE cable is available with _________ for interior wiring systems.
an insulated grounded conductor
Type SER cable may be used ________.
as a subfeed under certain conditions
Conductors used for electric water heaters must be sized at __________.
125% of the heater's nameplate rating
