Electrical Flashcards
Electricity needs a force to move it through the conductors.
This force is called what?
And, is measured in what?
Voltage and Volts
Voltage is expressed as what an ohms law calculations?
E
The amount of electricity moving through the conductors is called what?
And, is measured in what?
Current and amps
Current has expressed as what in ohms law?
I
The work performed by electricity in a load is called what?
and is measured in what?
Power and watts
Power is expressed as what in ohms law?
P
Electricity encounters resistance when flowing in conductors and in loads. This is called what?
And, is measured in what?
This is called resistance or impedance. And is measured in ohms
Ohms is Expressed as what in ohms law?
R
Grounding and bonding are often confused with each other. Both are safety related systems, but grounding is more about protecting what? And bonding is more about protecting what?
Equipment and people
Two examples of Ohms Law
P=IxE
E=IxR
What system of the house acts like a voltage surge suppressor?
The grounding system
What safety system helps clear ground faults in normally non-current carrying materials?
Bonding
The grounding electrode system of a house electrical system consist of what two things?
Grounding electrode and grounding electrode conductor
A UFER ground contains copper wire encased in concrete. How many feet? And size?
20 feet of #4 rebar or #4 AWG Bare copper
The grounding electrode conductor should be at least what size for an 150 amp or greater service?
6 AWG
4 AWG Copper wire is required for UFER grounding electrodes with what size amp service or greater?
200 amp
What size copper wire may be used for 125 amp and smaller services for the GEC?
8 AWG
Single phase 120V electrical service to a house is usually considered a reportable deficiency. True or false
True
What is the minimum electrical service current for a modern single family house?
100 amps
Key word current.
What are examples of required and dedicated branch circuits?
Kitchen countertop receptacles
Furnace or air handler
Receptacles in the laundry room
Receptacles in bathrooms
Kitchen exhaust fan or microwave oven
Is the service load for the home (greater or less than) the sum of all circuits in the house?
Less then
Service drop clearance above the roof.
Roof deck with pedestrian traffic?
10 feet
Service drop clearance above the roof, on a roof slope less than 4/12?
Greater than or equal to 8 feet or greater than or equal to 3 feet if roof guarded or isolated.
Service drop clearance above the roof where the roof slope is greater than 4/12?
Greater than or equal to 3 feet
Service drop clearance above the roof, eave is less than or equal to 4 feet past house of wall?
Less than or equal to 6 feet of cable above eaves.
Greater than or equal to 18 inches from drip lines.
Maintain all clearances past roofline for greater than or equal to 3 feet
Service drop clearance above the ground.
Garage, driveway, street
Greater than or equal to 10 feet above ground or walkway.
Greater than or equal to 12 feet above residential driveway.
Greater than or equal to 18 feet above public street alley or parking lot.
Service drop clearance to building openings.
3 feet clearance required
Except for conductors and conduit and conductors and sheeting. Clearance is not required above openings
The service equipment to the electrical panel, should have clear working space in the front?
At least 36 inches deep, 30 inches wide, and 78 inches tall, measured from the floor
Areas were GFCI protection for receptacle is now required are usually where water may be present which includes?
Kitchen countertops bathrooms garages laundry rooms unfinished basement unfinished detached buildings crawl spaces outdoors
What are AFCI circuit breakers and receptacles intended to do?
Protect structures from fire caused during an arcing fault condition of the wiring within the wall, the installed switches and outlets, and the equipment plugged in.
Maximum Ampacity of conductors in an NM cable.
AWG - Amps 14 - 15 12 - 20 10 - 30 8 - 40 6 - 55 4 - 70
Aluminum is one size AWG larger, i.e., 14 AWG is 12 AWG
Note: larger wires hard smaller numbers
Name the potential problem panel boards
Federal Pacific stab block panel boards
Zinsco/zinsco - Sylvania
Bulldog Pushmatic
Common receptacles
120 V 15 amp,
240 V, 30 amp
120 V, 20 amp
Kitchen countertop receptacles, GFCI protected receptacles, serving walls above kitchen countertops should be spaced so there’s no point along the wall above the countertop is more than what?
2 feet from receptacle, this means receptacles are often spaced about every 4 feet
Receptacle serving walls in the habitable rooms should be spaced so that no point along the wall is more than what from a receptacle?
6 feet, this means it receptacles are often spaced about every 12 feet
When are receptacles required on the peninsula or Island?
If it measures more than 2 feet long and 1 foot wide.
Receptacles may be mounted on a kitchen island or peninsula cabinet so long as?
Receptacle is not more than 12 inches below the countertop and does not extend more than 6 inches past cabinet
Bathroom receptacles, at least one GFCI protected receptacle should be located within how many feet of the outside edge of each bathroom sink?
3 feet,
Outdoor receptacles, at least one GFCI protected receptacle should be installed within…
78 inches vertically from the walking surface at both the front and rear of the house.
Hallway receptacles, at least one receptacle should be installed…
In a hallway that is 10 feet or more
HVAC service is receptacles, at least one receptacle should be installed…
Within 25 feet from the same level as the HVAC equipment
What is the maximum height of a switch?
79
Required lights, a wall switch controls light should be located…
In every habitable room and bathroom.
The light fixture should be a permanent ceiling or wall fixture in what rooms
Kitchens bathrooms Hallway stairway attached garage and exterior doors
the light fixture may be controlled by switch in other rooms
Most exterior stairway should have a light where?
Near the top of the landing, unless the stairways to a basement which will be at the bottom landing
Keyword exterior
Basement, attics and crawlspace should have at least…
One light if the space if used for storage or if it contains equipment that requires service
Lights near tubs and showers, hanging light fixtures track lights and ceiling fans should have no parts located within…
A zone from 3 feet horizontally and 8 feet vertically from the tub room door threshold
Keyword hanging, Lights within the parameters should be listed for damp areas
Lights in clothes closet, Can light fixtures with exposed incandescent bulbs be located anywhere in the closet?
No
The clothes were closet is divided into two storage areas. What are they?
The hanging rod storage area extends vertically from the floor to the highest rod or 6 feet, which ever is higher, and 2 feet from the walls
The shelf storage area extends vertically from the highest shelf to the ceiling and horizontally from the widest shelf or 12 inches from the wall which ever is greater
Lights in clothes closet, Surface mounted incandescent an LED fixtures should not be located within…
12 inches from closet storage areas.
Lights in clothes closet, Surface mounted fluorescent fixtures and recessed incandescent, LED, and fluorescent fixtures should not be located within…
6 inches from closet storage areas
According to the standards of practice what is required by the home inspector to report regarding smoke alarms and Carbon monoxide alarms?
The presence or absence of smoke alarms and Carbon monoxide alarms. You do not have to test them
Many smoke alarm manufactures recommend the replacing of smoke alarms after…
About 10 years
Carbon monoxide alarms have a shorter service life than smoke alarms, which is?
5 to 7 years
Smoke alarm locations, the minimum requirement of a smoke alarm is?
An alarm in each bedroom and in the hallway near the bedroom
At least one smoke alarm on each story, including basement and have habitable Attics
Not including crawlspaces
What is the ideal smoke alarm location on the ceiling?
At least 4 inches away from the wall
Installation of smoke alarms on the wall is acceptable? True or false
True, so long it is at least 4 inches
and less than 12 inches from the ceiling.
Voltage will decrease in a circuit as the resistance increases, given a constant current load.
Why is this important?
This is important when dealing with long wire lengths and small conductor sizes.
The longer the wires and the smaller the wires the more resistance
Voltage will decrease in a circuit as the resistance increases, given a constant current load.
Why is this important?
This is important when dealing with long wire lengths and small conductor sizes.
The longer the wires and the smaller the wires the more resistance
