Calculations
The general lighting load for a dwelling is calculated at this many VA per square foot.
3 VA
When a screw is used as a main bonding jumper, it must be finished in this color.
Green
This is the first stage of an electrical installation when raceways and boxes are installed.
Roughing In
Conductors extending from the panelboard to the various outlets are known by this term.
Branch Circuits
On a wiring plan, this symbol is used to identify a three-way switch.
S3
This "factor" is used when sizing services because not all outlets are used at the same time.
Demand Factor
This classification of grounding includes the service entrance and conductors forming a fault path.
System Grounding
This is the trade name commonly used generically to refer to any Type NM cable.
Romex®
A circuit routed to a switch box for the purpose of controlling electric lights is called this.
Switch Leg
This type of switch is designed to reduce the clicking noise during operation.
Quiet Switch
Each required small-appliance and laundry branch circuit must be calculated at this many VA.
1,500 VA
A metal underground water pipe must be in contact with the earth for at least this many feet to be an electrode.
10 feet
This cable is similar to NM but features a moisture-resistant jacket for direct burial.
Type UF
Large appliances like electric ranges and clothes dryers typically operate on this voltage.
240 Volts
In a standard 125V receptacle, the ungrounded (hot) wire is connected to this color terminal screw.
Brass
If a home has 4 or more fastened-in-place appliances, this percentage demand factor is applied.
75%
Pipe electrodes may be driven at an angle if rock is present, but must reach this minimum depth.
8 feet
This cable has one or more insulated conductors enclosed in an armor of interlocking metal tape.
Type MC / Metal-Clad
240V appliances like dryers require this specific type of circuit breaker.
Double-pole or 2-pole
To control a light from three locations, you need two 3-way switches and one of these.
Four-way switch
Calculate the total VA for a 2,000 sq. ft. home's lighting plus 2 small-appliance and 1 laundry circuit.
10,500 VA
This specific device provides a path around concentric knockouts in an enclosure.
Bonding Jumper
Type SE cable is available with this type of insulated conductor for interior wiring systems.
Grounded or Neutral conductor
A water heater circuit is calculated at 4,500 VA because only this many elements operate at once.
One
To control a light from five locations, you need two 3-way switches and this many 4-way switches.
Three