Module 2 Electrical Systems

Pataasin ang iyong marka sa homework at exams ngayon gamit ang Quizwiz!

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


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