Electrical Capstone - 2021

The National Electric Code is based on

NFPA

The National Electric Code is based on

removed without damage to the building.

12 gauge NM-B cable has a maximum current rating of _ amps.

20

14 gauge NM-B cable has a maximum current rating of _ amps.

15

A Class A GFCI is a device that trips when the __ to ground has a value of 4mA to 6mA.

current

A GFCI

detects a difference in current between the black and white wires.

A GFCI

trip in 1/40th of a second.

A GFCI

protects people from electrical shock

Service loads to a one-family dwelling require a minimum service disconnect rating of ___A.

100

A grounding conductor is the conductor that connects electrical equipment or the grounded conductor to the ___

grounding electrode

A motor is a dynamo that used to change

electrical energy into mechanical energy.

A motors _ determines what proportion of the total electrical power is active power and what proportion is reactive power.

power factor

A person with a serious electrical injury should be moved

only if in immediate danger

A(n) ___ is an enclosed channel of metal or nonmetallic materials used to contain the wires or cables of an electrical system

raceway system

According to OSHA safety regulations, guardrails or a personal fall arrest system is required for workers on scaffolding ___ ft. or higher.

10

According to OSHA safety regulations, guardrails/toprail on scaffold platforms must be between inches and _ inches.

38,45

According to OSHA safety regulations, load carrying timber members must be a minimum of ___ lb-f/in squared construction grade lumber.

1500

Stairways with at least 4 risers, rising more than 30 inches are to be equipped with;

at least one handrail on each unprotected side

According to OSHA safety regulations, platforms must be at least _in. wide or guardrails and personal fall arrest systems must be used..

18

According to OSHA safety regulations, platforms must be_.

fully planked

According to OSHA safety regulations, scaffolds must be able to support up to ____ times the intended load.

4

According to OSHA safety regulations, suspension scaffold rigging must be able to support up to ____ times the intended load.

6

According to the National Electric Code, Flexible conduit needs to be supported within ____ inches from a junction box or outlet.

12

All 15 A and 20 A, 125 V receptacles installed in patient care areas of pediatric wards, rooms, or other areas shall be listed tamper-resistant or shall employ a listed tamper-resistant cover.

true

All portable and semi-portable tools must be grounded unless they are;

double insulated

All receptacles in dwelling crawl spaces at or below grade shall be GFCI-protected.

true

All receptacles installed in dwelling bathrooms shall be GFCI-protected.

true

All receptacles which serve countertops in dwelling kitchens shall be GFCI-protected.

true

An electrical circuit has a voltage of 50 V and a resistance of 5 ohms. What is the value of current?

10 A

An inductor is connected to a 120-V, 60-Hz supply. The current in the circuit is 2.4 A. What is the inductive reactance?

50 ohms

Any place there is a break in elevation of _, a stairway, ladder, or ramp, shall be provided.

19in

Article 100 of the National Electric Code Covers

definitions

Article 110 of the National Electric Code Covers

Requirements for Electrical Installations

Article 90 of the National Electric Code Covers

Introduction

Bored holes through wood members must __ from the edge.

1 1/4

Cables and raceways installed under streets, highways, roads, driveways, and parking lots shall be buried to a minimum depth of ___ ².

24

Cables or raceways in notches of framing members shall be protected from nails or screws by a steel plate at least ___ ² thick.

1/16

Circuits which provide switchboards with pilot lights are required to be protected by standard overcurrent devices rated at ___ A or less

15

Conductors of different systems (600 V or less, AC and DC) may occupy the same raceway.

true

Conductors used for direct burial shall be identified for such use.

true

Double-cleated ladders or two or more ladders must be provided when ladders are the onlyway to enter or exit a work area where _ or more employees work or when a ladder servessimultaneous two-way traffic.

25

Each step or rung of a fixed ladder must be able to support a load of at least _ poundsapplied in the middle of the step or rung.

250

Fuses and ___ are OCPDs designed to automatically stop the flow of current in a circuit that has a short circuit or is overloaded.

circuit breakers

Ground Fault Interrupter circuits are normally used in _

wet locations and construction sites

Handrails must be between in height.

30-37 inches

Handrails shall be capable of withstanding pounds of downward force.

200

Holes that are drilled into framing members to permit the installation of raceways or cables shall be at least ___ ² from the nearest edge of the wood member.

1 1/4

How many current sensing devices are required by the National Electrical Code to protect a three-phase motor operated on 480 volts?

three

Lockout Tagout devices must be

durable

On a blueprint scale of 1/8 inch = 1 foot, a 3 1/2 inch length represents ft.

28

One way to protect workers from electrical shock is to

use insulated tools and/or coverings.

Overload relays can be classified as thermal or

magnetic

Per 230.24(A), overhead service conductors shall have a minimum verticle clearance of not less than ___ feet above rooftops.

8

Permanent handrails are to have clearance of inches between the rail and wall.

3

Portable Ladders must capable of supporting the following loads without failure.

4 times the maximum intended load.

S3 is the symbol for a

three way switch

Section 430.32 of the National Electric Code States that a motor must be protected up to____% of its FLC Rating.

125

THW conductors are permitted to be installed in wet locations.

true

The flow of electrons is called _

current

The minimum amount of wire that should be left in a workbox is _ inches.

6

The minimum size electrical panel for a dwelling is

100 Amp

The neutral conductor is also referred to as the _ conductor.

grounded

The neutral of an electrical system is always carrying the unbalanced current of that system.

true

The proper angle for setting up a ladder is to place the base a/an of the working length of the ladder from the wall or vertical surface.

Quarter

The service ___ is the point of connection between the local electrical utility company and the premises wiring of the building or structure.

point

The symbol X L stands for

inductive reactance

The symbol for capacitive reactance is

XC

Toe boards on scaffolding must be _ inches tall, and no more than ____ inches above the surface of the floor.

3.5, .25

What agency requires employers to provide a workplace free of recognized hazards for its employees?

OSHA

What are two types of thermal overload relay?

bimetal strip type and solder melting type

What does a dashed line drawn between components represent?

They are mechanically connected together so that both will operate at the same time.

What does the 12 in NM-B 12/3 stand for?

gauge

What happens to current when resistance increases?

decrease

What happens to current when voltage increases?

increases

What is the difference between inching and jogging?

Inching is accomplished by momentarily applying reduced voltage to the motor and jogging is accomplished by momentarily applying full voltage to the motor.

What is the unit of potential difference?

Volt

What symbol represents current?

I

What symbol represents voltage?

V

What wire can be used as a hot wire if marked with 3 black stripes on each end?

white

When extinguishing a fire involving a metal frame structure, a fire extinguisher should be used.

Class D

When extinguishing a fire involving an electrical appliance, a fire extinguisher should be used.

Class C

When extinguishing a fire involving cooking grease, a fire extinguisher should be used.

Class K

When extinguishing a fire involving diesel fuel, a fire extinguisher should be used.

Class B

When extinguishing a fire involving wood framing or cardboard boxes, a fire extinguisher should be used.

Class A

"Scaffolds where platforms are overlapped to create a long platform, the overlap shall occur only over supports, and shall not be less than 12 inches (30 cm) unless the platforms are nailed together or otherwise restrained to prevent movement."

True

When portable ladders are used for access to an upper landing surface, the side rails must extend at least _ feet above the upper landing surface.

3

When there is a break in elevation of or more and no ramp, runway, embankment or personnel hoist is available, employers must provide a stairway or ladder at all worker points of access.

19 inches

Whenever service conductors are installed as open conductors, a clearance of ___ feet shall be provided from windows, doors, or similar locations.

3

Which of the following is true concerning the National Electrical Code?

The NEC is not a law unless it is adopted as law by a local authority.

For purposes of receptacle spacing, the Code requires that an individual wall space shall be considered to be ____ or more in width.

2 feet

How many outside receptacles, accessible at grade level, are required for a single-family dwelling?

2 receptacles

A ground rod must be a minimum of _ in length.

8 feet

A receptacle is installed outdoors on the porch of a dwelling unit. The receptacle is located such that it is near the open railing of the porch, but it is at a height of 7 feet above grade level. Which of the following best describes Code requirements for installation of this receptacle?

It must be GFCI protected as it is outside

Each kitchen is required to have a minimum of ____ small appliance branch circuit(s).

two

Receptacles are required to be installed so that no point along the floor line in any wall space is more than from an outlet in that space.

6 feet

Service cable shall be secured within _ of a weather head and meter socket.

12 inches

A 240 volt, single-phase, 30 ampere-rated, electric clothes dryer will have a VA rating of ____.

7,200

A ground rod is required to be driven a MINIMUM of ____ feet into the soil.

8

A metal underground water pipe may serve as a grounding electrode if it is in direct contact with the earth for at least ____ feet or more.

10

Electrical outlet box installed in walls and ceilings are required to be _.

accessible