Module 11 - Residential Electrical Services
A __________ is a circuit that carries current from the service equipment to a sub-panel or a branch circuit panel or to come point in the wiring system.
feeder
According to NEC Section 220.53, a demand factor of 75% may be applied to __________.
fixed appliance loads
If a dwelling has two kitchen areas, then the total small appliance branch circuits required would be __________.
four at 1,500VA each
When a screw is used as a main bonding jumper, it must be colored __________.
green
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
Normally located at the service entrance of a residential installation, a _____ _____ sometimes contains the main disconnect.
load center
In a residential pool area, receptacles __________.
must be at least 6 feet from the inside walls of the pool.
Raceway, cable, wires, boxes, and other equipment are installed during __________ ____.
roughing in
The __________ _____ is comprised of the conductors that extend from the last power company pole to the point of connection at the service facilities.
service drop
The __________ __________ is the point where power is supplied to a building.
service entrance
A __________ __________ is comprised of the underground conductors through which service is supplied between the power company's distribution facilities and their first point of connection to the building.
service lateral
The _______________ __________ lie between the point of termination of the overhead service drop or underground service lateral and the main disconnecting device in the building.
service-entrance conductors
The _______________ __________ mainly provides overcurrent protection to the feeder and service conductors.
service-entrance equipment
Type NM cable may not be used in __________.
shallow chases of masonry, concrete, or adobe
A wall switch is required to control stairway lighting at each level when the levels are separated by __________.
six or more risers
A __________ is used for turning an electrical circuit On and Off.
switch
The circuit that is routed to a switch box for controlling electric lights is known as a __________ _____.
switch leg
The correct operation of a four-way switch requires at least __________.
two three-way switches
Which of the following areas of a residence would most likely use conductors run in conduit?
unfinished basements
The brass screw on a receptacle connects to the __________.
ungrounded conductor
Type MC cable may NOT be used __________.
where subject to physical damage
When sizing electrical services, at which percentage is the first 3,000VA is rated at __________.
100%
The minimum service disconnecting means for a one-family dwelling is __________.
100A
A branch circuit for lighting has a capacity of 1,800VA. It should be loaded to no more than __________.
1,440VA
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
Service drop conductors must be located at a minimum height of __________.
10' above the ground or other accessible surface
Per NEC Table 220.54, a household with two dryers has a demand factor of __________.
100%
A single-pole GFCI breaker is rated at __________.
120VAC
Conductors used for electric water heaters must be sized at __________.
125% of the heater's nameplate rating
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
Exposed noncurrent-carrying metal parts of fixed equipment must be grounded if the equipment operates with any terminal over
150V to ground
The minimum number of small appliance circuits required by the NEC in a kitchen area is _____.
2
NEC Section 230.6 considers conductors to be outside the building when installed under at least __________.
2" (50 mm) of concrete
A small residence has a floor area of 900 square feet. What is its general lighting load?
2,700VA
When used as a grounding electrode, a ground ring must be at least __________.
20' (6.0 m) long
A lighting load of 2,700VA at 120V has an amperage of __________.
22.5A
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
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)
The general lighting load in a residence is 3,600VA at 120V. What is the amperage?
30A
Switch leg
A circuit routed to a switch box for controlling electric lights.
Feeder
A circuit, such as conductors in conduit or a cable run, that carries current from the service equipment to a subpanel or a branch circuit panel or to some point in the wiring system.
Metal-clad (Type MC) cable
A factory assembly of one or more insulated circuit conductors with or without optical fiber members enclosed in an armor of interlocking metal tape, or a smooth or corrugated metallic sheath.
Nonmetallic-sheathed (Type NM) cable
A factory-assembly of tow or more insulated conductors enclosed within an overall nonmetallic jacket. Type NM contains insulated conductors enclosed within an overall nonmetallic jacket; Type NMC contains insulated conductors enclosed within an overall, corrosion-resistant, nonmetallic jacket; and Type NMS contains insulated power or control conductors with signaling, data, and communications conductors within an overall nonmetallic jacket.
Switch
A mechanical device for turning an electrical current On and Off.
Bonding bushing
A special conduit bushing equipped with a conductor terminal to accept a bonding jumper. It also has a screw or other sharp device to bite into the enclosure wall to bond the conduit to the enclosure without a jumper when there are no concentric knockouts left in the wall of the enclosure.
Load center
A type of panelboard that is normally located at the service entrance of a residential installation. It sometimes contains the main disconnect.
__________ are pieces of equipment that has been designed for a particular purpose.
Appliances
Appliances
Equipment designed for a particular purpose (for example, using electricity to produce heat, light, or mechanical motion). Appliances are usually self-contained, are generally available for applications other than industrial us, and are normally produced in standard sizes and types.
Service-entrance equipment
Equipment that provides overcurrent protection to the feeder and service conductors, a means of disconnecting the feeders from energized service conductors, and a means of measuring the energy used.
Romex
General Cable's trade name for type NM cable; however, it is often used generically to refer to any non-metallic-sheathed cable.
A cable that contains insulated circuit conductors enclosed in armor made of metal is ____.
MC
Which section of the NEC requires that fittings be identified for use with service masts?
NEC Section 230.28
Information on equipment grounding for computers is found in __________.
NEC Section 250.114
A factory-assembled cable with two or more insulated conductors and a nonmetallic jacket is called ____.
NM
The term __________ is General Cable's trade name for Type NM cable, but it is often used to refer to any nonmetallic-sheathed cable.
Romex
Service-entrance conductors
The conductors between the point of termination of the overhead service drop or underground service lateral and the main disconnecting device in the building.
Roughing in
The first stage of an electrical installation, when the raceway, cable, wires, boxes, and other equipment are installed. This is the electrical work that must be done before any finishing work can be done.
Service drop
The overhead conductors, through which electrical service is supplied, between the last power company pole and the point of their connection to the service facilities located at the building.
Service entrance
The point where power is supplied to a building (including the equipment used for this purpose). The service entrance includes the service main switch or panelboard, metering devices, overcurrent protective devices, and conductors/raceways for connecting to the power company's conductors.
Branch circuit
The portion of a wiring system extending beyond the final overcurrent device protecting a circuit.
Service lateral
The underground conductors through which service is supplied between the power company's distribution facilities and the first point of their connection to the building or area service facilities located at the building.
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
In three-wire NM cable, the color code of the conductors is __________.
black, white, and red, with a bare or green grounding conductor
A __________ __________ is equipped with a conductor terminal to accept a bonding jumper.
bonding bushing
A __________ __________ is a bare or green insulated conductor used to ensure conductivity between metal parts that are required to be electrically connected.
bonding jumper
The portion of a wiring system that extends beyond the final overcurrent device is the __________ __________.
branch circuit
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