Electrical Practice Exam
Assuming copper, standard wire type and normal temperature rating, what is the typical conductor size in AWG for a 100 amp service?
#4
What size is the wire for a UFER ground?
#4 copper (if rebar is used it is also #4 rebar 20ft long)
What size wire should go to a grounding rod?
#6 copper
Which of the following wires are stranded?
#8, #6 (Both C and D)
Minimum distance of a GFCI from a bathtub or shower:
0 by the code (36 by the brown book, but on exam it should be 0)
How many seconds does it take to trip a GFCI?
1/40th second
Overhead wire clearance must be a minimum of how many feet above walking surfaces?
10'
A 3 wire system is coming into the house at 110. What is it called?
110/220
Over current protection for Aluminum wiring is
12 AWG/15 AMPS
Overhead wire clearances must be how many feet above residential properties and driveways?
12'
If you used a multimeter to measure the current in a 3,000 watt electric water heater that uses both of the underground (hot) service conductors, it would read?
12.5 amps
The most common wire size for branch household circuits is ______ gauge.
14 gauge
Clearance in any direction from the diving platform of a swimming pool is how many feet?
14' 5" or 14in older code
Over current protection for Copper is
14AWG/15 AMPS
Which of the following is not a common service amperage?
175 amp
In a garage an outlet must be a minimum of ______ inches above the floor.
18" inches
How many 20 amp breakers must service a kitchen?
2
In a multi wire branch circuit, with the red and black wire improperly tapped from the same bus, if the red wire carries 10 amps, and the black wires carries 12 amps, the neutral wire will carry?
22 amps (unsafe condition on a 14 gauge wire)
Electrical lines must be a minimum of how many feet above a pool?
22.5' or 22' -2003
At a kitchen counter, countertop receptacle outlets shall be installed within a maximum horizontal distance of _______ from any point along the wall to an outlet.
24 inches
What min. size breaker is needed for a water heater that has 4500 watts and 240 volts?
25 amp
Maximum distance of an outlet from a lavatory/basin:
3'
How long can an electrical cord be for pool pumps?
3' feet
Service conductors must be located at least how many feet from sides of doors,porches, decks, stairs, and operable windows?
3' feet
What size breaker would you find on a dryer?
30 amp
Type NM wiring shall be supported a maximum of _______ on center.
4.5 feet
A kitchen counter is 8' long. It may have a maximum of
48" inches of space between receptacle within 2' ft along the counter
How many milli amps does it take to trip a GFCI outlet?
5 to 8 mil (4-6 mil for breaker trip)
How far from a pool can an electrical breaker box be located?
5' feet
How far from a spa/hot tub must a receptacle outlet be located?
5' feet
What is the size of a ferrous grounding rod?
5/8" (1/2" copper or non ferrous)
What the maximum number is of disconnects needed to terminate service?
6 disconnects
What is the length of cord for a plug and pull lamp?
6' ft
What is the maximum length of a Stove Cord?
6' ft max
How high above the spa would the light fixture need to be installed?
7' 6"
If you had a 10 gauge copper wire rated for amperage what size aluminum wire would you need?
8
Overhead wires must be at least how many feet over a flat roof?
8' feet
What is meant by open splice?
A connection not made inside a junction box
Which of the following aluminum wire installations is most likely to over heat?
A receptacle with an electric heater
Nicked wire causes what to happen?
ARC's
Where would you find a GFCI on a hydrotherapy tub?
All of these are true: under the tub, many times inaccessible, it is not required to be within sight of the motor
Bonding the gas piping to the supply plumbing system mean that:
Any stray electrical current will not cause arcing, which otherwise could ignite the gas
15 AMP circuits are used where?
Branch circuit wiring
What do you look for to determine if a switch or receptacle is acceptable for copper and aluminum wiring?
CO/ALR
What type of receptacle should not be used with aluminum branch circuits wiring any longer?
CU/AL
Isolating link should be used with a light that has metal pull chains. The isolating link is made of:
Cardboard or plastic
A device designed to open and close a circuit by non-automatic means and applied within its rating to open the circuit automatically when predetermined over-current is called?
Circuit Breaker
What type of wire nut is not appropriate for aluminum wire?
Conventional
Which of the following is a good conductor?
Copper,Aluminum & Silver (All of the above)
If you had a 1960's house and the panel box is in the closet with clothes touching it
Deficient, write it up
If you have an A/C unit outside disconnect on a 1960 house with a 35 amp breaker, and the owners have it on a 60 amp breaker.
Deficient, write it up
Polarity occurs when?
Electrical receptacle is connected (properly)
What is another name for a grounding rod?
Electrode
18 gauge lamp cord where is it commonly used/installed?
Entry/Breakfast table area/ dining room
The drip loop is typically part of the service drop.
False (It is part of the service entrance)
What are two examples of automatic circuit breakers?
Fuses and Breakers
How should the feeder wires to a sub-panel from the main panel ideally be protected?
Fuses should be provided at the main panel
What is required to be installed in unfinished basements or exterior walls?
GFCI
Flexible metal conduit is sometimes referred to as?
Greenfield
What effects polarity?
Hot and neutral crossed
On a deck, porch or patio which is required?
Illumination
Report as deficient breaker boxes that are?
Installed in hazardous location/safety issue
What is the purpose of a circuit breaker?
Interruption of electrical flow
You have a panel rated at 200 AMPS, you have 195 AMPS in use, a breaker at 25
It is okay
If a conductor wire is nicked, what does it do to the wire?
Lose Amperage
Wire should not be run on wall surfaces without
Mechanical protection
How should 18 gauge speaker wire be installed in a ceiling?
Mounting Bracket
A house was built in 1955 and the inspector notices the wires have a silver coating. What type of wiring is this?
Nickel coated copper (clad)
Where is the antioxidant grease typically used?
On stranded aluminum wiring
Is the service drop overhead or underground?
Overhead
Antioxidants do what?
Prevent oxidation
Abandoned wires should be
Removed
You notice that the service drop and service entrance conductors are bare at the splice. You should
Report this as a safety hazard
What is another term for NM sheathed cable?
Romex
Two reasons for dedicated circuits are that
The circuit uses so much electricity, and the circuit is so important
Which of the following is a safety issue?
The main fuses have a higher rating than the service entrance wire.
A house has service entrance conductors designed for 100 amps and a main disconnect rated at 100 amps. Which of these conditions is unsafe?
The service box is rated at 75 amps
Which of the following is a reliable way to identify the service size?
The service entry conductor size
A 1,500 square foot house has an electric stove, electric dryer, central air conditioning (FLA + 18 amps), and a recent basement renovation that included the installation of a 3,000 watt sauna. If it has a 60 amp service, you should report that?
The service should be upgraded
A copper #6 gauge cable has supplied a sub panel. The cable is protected by 60 amp breakers at the main panel. You should make sure that
The sub panel is rated to handle at least 60 amps
Double tapping is?
The term for attaching two wires to a single fuse or breaker terminal
Where must a light switch be for a light in the stairwell?
Top an bottom of well
Which of the following are not approved methods of connecting aluminum wiring?
Twist Lock
What is required for electrical receptacles for a swimming pool motor?
Twist Lock and GFCI
Are service laterals overhead or underground?
Underground
Which is deficient?
Unused opening that has been taped
Can BX cable be used at receptacle outlets?
Yes, metal only. BX and Greenfiled are interchangeable
During an inspection you find a 20 amp and a 15 amp blown fuses beside the panel, you might tell your client that
it's likely that there is at least one overloaded circuit in the panel
A subpanel is supplying a 3 ton air conditioning (running load amps=18A) and an electric dryer (5,000W). The 10 gauge copper subpoena feed wire is connected to a 60A breaker in the main panel. You should
recommend changing the size of the feed wire to match the breaker
A panel is servicing an indoor pool area, and is not in mechanical room next to the pool. You should be looking for?
rust problems
Clamp on amp meters may be used on electric furnaces to check
that all the elements come on
In the service box, the underground service entrance wires should be connected
to the line side of the main switch
