Module 2 Electrical Systems
A copper wire at least # ___ AWG must connect the structural rebar within the pool structure and deck, wet niche fixtures of underwater lighting, slides, diving boards, ladders, pumps and their associated equipment, and any other exposed metal apparatus within __ feet of pool walls.
#8, 5 feet
In most areas, for what distance can service entrance wires run inside the building before going into the service box, without special permission?
0 feet, or as short as possible
What are the color codes for fuses?
10 amp - yellow or slate (can appear grey) 15 amp - blue or purple 20 amp - orange or red 25 amp - green or yellow 30 amp - green
What size copper wires are adequately protected (Amp and gauge ratings)
15 amp - 14 gauge 20 amp - 12 gauge 30 amp - 10 gauge 40 amp - 8 gauge 55 amp - 6 gauge 70 amp - 4 gauge
The maximum cord length permitted for cord pool equipment is ___ feet?
3
All switches must be greater than ___ horizontal feet from pool walls
5 feet
A fuse being what is a safety concern?
A fuse being too big
An overcurrent protection device can be
A fuse or breaker
What would suggest an improperly supported service drop?
A missing drip loop
What is the definition of a volt?
A volt is the measure of the force or potential energy in an electrical system (V=I×R)
What is a brief definition of a watt?
A watt is a measure of the current of electrical energy being consumed or released. (P=VxI)
What is a brief definition of an amp?
An amp is a measure of how much electrical current is flowing (I=V/R)
How do you determine the service size?
By the amperage and voltage ratings of the service.
What are 3 common areas of water penetration?
Conduit joints, Mast head, and roof flashing
After entering the service box, the neutral service entrance conductor should
Connect to the terminal with the grounding electrode conductor and the service neutral
Solar photovoltaic systems use light from the sun to produce ___ electricity
Direct current
Polarity occurs when?
Electrical Receptacle is connected (properly)
Gas piping or "black pipe" can be used as a ground. True or False?
False
Home inspectors are required to inspect a solar photovoltaic system. True or False?
False
The grounding electrode conductor may also be called ___.
Ground wire
What is required to be installed in unfinished basements or exterior walls?
Ground-Fault Circuit Interrupter (GFCI)
What effects polarity?
Hot and neutral crossed
Report as deficient: breaker boxes that are?
Installed in hazardous location/safety issues
Problems with aluminum wiring include all of the following
It tends to creep out from under terminal screws, some of the early aluminum wiring was low quality, and the aluminum oxide is not a good conductor of electricity
What is the advantage of a 240-volt circuit?
More electricity can flow at lower amperage ratings
What are two common problems with service entrance conductors?
No drip loop and no mast head
What is the definition of an ohm?
Ohm is a measure of resistance to electrical flow in a conductor or insulator (R=V/I)
What is a common problem with service drops?
Overhead wires too low
Alternative energy systems are also called ___ energy sources.
Renewable
The grounding systems are connected to the house neutral at the ___.
Service box
What is a suitable location for a branch circuit wire?
Stapled to 2x4 studs
What are some common closet lighting problems
The light is above a shelf bare bulbs are used bare bulbs are used with cages to provide mechanical protection installing the light above and toward one end of the shelf
In terms to a fuse and service entrance wire rating, what is considered a safety issue?
The main fuses have a higher rating than the service entrance wire
The ground service conductor is called
The neutral
Which one of the following is a reliable indicator of service amperage?
The size of the service entrance conductor
Double tapping is
The term for attaching two wires to a single fuse or breaker terminal
A 14-gauge copper wire is protected by a 20-amp fuse. You should report that
This is a defect and recommend improvement
From the point where the ground and the neutral wires connect, there are two paths to ground. What are they?
Through the neutral wire or through the grounding electrode conductor to water pipes or ground rods.
Where must a light switch be for a light in the stairwell?
Top and bottom of stairway
Service entrance conductors run the service drop to the service box or service panel. True or False?
True
Service laterals are installed ___.
Underground
Implication of an undersized service include:
nuisance tripping of the main fuses and breakers