Electrical Wiring Test 2
Push-in terminals use what type of wire?
14 AWG
Scientist usually agree on how much ohms of body and contact resistance?
800 to 1000 ohms
What does a GFCI switch do?
Monitors the current balance between the ungrounded "hot" conductor and the grounded conductor
A branch circuit consisting of two or more ungrounded conductors and a grounded conductor.
Multiwire branch circuit
What is the limit on the load of a branch circuits rating?
No more than 80%
3-wire Cable wiring
One Black "hot" One white "neutral" One red "hot" One bare "ground" -2 "hot", 1 "neutral (3-wire)
2-wire Cable wiring
One black "hot" One white "neutral" Bare "ground" -1 "hot", 1 "neutral" (2-wire)
4-wire Cable wiring
One black "hot" One white "neutral" One red "hot" One blue "hot" One bare "ground" -3 "hot", 1 "neutral" (4-wire)
Where do you install lights listed for wet locations?
Places subject to shower spray
What type of wiring device has back-wiring holes only?
Push-in terminals
What do you do for a push-in terminal?
Strip the conductor insulation off for desired length, insert into the hold and it is held in by its internal spring pressure mechanism.
The safe supporting of a ceiling-suspended fan involves 3 issues:
The actual weight of the fan The twisting and turning motion when the fan is started Vibration caused by unbalanced fan blades
Minimum number of lighting branch circuits needed
3 volt-amps per square foot
What a GFCI does not do.
Does not: Protect against electrical shock when a person touches both circuit conductors at the same time, (flows through the person)
Ungrounded "Hot" Conductor
An ungrounded conductor must have an outer finish that is a color other than green, white, gray, or three continuous white stripes
Where are GFCI switches used? Name 5
Bathrooms Garages Outside Kitchen Sinks
Popular colors for Ungrounded "Hot" Conductor
Black, Red, and sometimes Blue
What type of GFCI switch is most common?
Class A
What is the most common type of switch in lighting circuits?
Flush toggle switch
Grounded (Neutral) Conductor
For AC circuits, the NEC requires that the grounded conductor have an outer finish that is either continuous white or gray.
4 Groups of residential lighting.
General Lighting Accent Lighting Task Lighting Security Lighting
What does GFCI stand for? AFCI?
Ground Fault Circuit Interrupter Arc Fault Circuit Interrupter
Where do you install lights listed for damp or wet locations?
If located within the actual outside dimension of the bathtub or shower up to a height of 8ft
What does a GFCI switch do? (Continued)
Trips when current is 6mA or more Won't trip when current is less than 4mA Might trip when current is between 4mA and 6mA Opens in 25mS
Grounded conductors must be what color?
White, gray, or have three continuous white stripes
What are push-in terminals not used with?
aluminum or copper-clad aluminum conductors stranded conductors 12 AWG conductors
