J Nccer Book 3

Front 1

Class one locations

Back 1

Location in which flammable gasses or vapors are or may be present in the air and quantities sufficient to produce explosive or Ignitable mixtures

Front 2

Class 2 location

Back 2

Location that are hazardous but because of the presence of combustible dust

Front 3

Class 3 locations

Back 3

Locations that are hazardous because of the presence of easily Ignitable fibers or other fly material but in which such material are not likely to be in suspension in the air in quantities sufficient to produce in Ignitable mixtures

Front 4

Class division one

Back 4

Is an environment that is normally hazardous

Front 5

Class division 2

Back 5

Is an environment that is not normal to has it is but could become hazardous

Front 6

Frame Classification or frame sizes

Back 6

100 A. 15-100

225A. 125-225

400A. 250-400

1000A. 500-1000

2000A. 1200-2000

Front 7

The general lining load for a store is

Back 7

3VA/FT SQUARED

Front 8

The general lighting load (exposed as a unit load per square foot) for a warehouse is

Back 8

1/4VA/ft squared

Front 9

A continuous load is defined by the nec as a load whose maximum current is expected to continue for at least

Back 9

3 hours

Front 10

What is the capacity in amperes for a 20 amp circuit breaker supplying a continuous load

Back 10

16A

Front 11

Branch circuit conductors supplying continuous duty loads are calculated at

Back 11

125% of the rated load

Front 12

What is the current carrying ampacity for a 10 number 10 THHN copper conductor installed in a single conduit

Back 12

20A

Front 13

The voltage drop between the point of service and the fartherest outlet in a branch circuit should not exceed

Back 13

3%

Front 14

Load calculations for circuit supplying lighting units with ballast are based upon

Back 14

The ampere ratings of the ballasts

Front 15

What is the maximum number of general purpose non continuous duty duplex receptacles that can be connected to a 20 apps 120 V circuit in a commercial building? what is the NEC required load rating for each receptacle

Back 15

13 receptacles / 180 VA

Front 16

What is the total load and VA for 2 small appliance branch circuits in a single family dwelling

Back 16

3000 VA

Front 17

What is the minimum conductor and pass it I44 1000 W 208V 1\0 electric baseboard heater

Back 17

19.23A

Front 18

The load for 6' of multi outlet assembly you simultaneously is

Back 18

1080VA

Front 19

How many receptacles are required for 90 linear feet of show window area

Back 19

Six

Front 20

All things considered the most ideal conductor is made of

Back 20

Copper

Front 21

Which of the following is a standard configuration for standard wire

Back 21

7 strand

Front 22

Of the following the largest standard AWG wire size is

Back 22

4/0 AWG

Front 23

A branch circuit is best described as

Back 23

The circuit conductor between the final over current device protecting the circuit and the outlet

Front 24

The rating of a branch circuit is determined by

Back 24

Rating of the branch circuit over current device

Front 25

A continues load is best described as one in which the maximum current is expected to continue for

Back 25

3 hours or more

Front 26

Which of the following is a standard fuse rating

Back 26

601A

Front 27

You will find information all conductors applications and descriptions of insulation types in

Back 27

NEC 310. 104 (A)

Front 28

The constant K for resistance of ordinary copper is

Back 28

12.9 per mil foot

Front 29

A lumen falling on 1 ft² of surface produces a lumination of

Back 29

One footcandle

Front 30

Lighting that directs well focus lumination to a specific surface such as a kitchen counter is classified as

Back 30

Task lighting

Front 31

Lighting fixtures installed in offices stores and public buildings are classified as being used in

Back 31

Commercial service

Front 32

Lighting fixtures that distribute 40% to 60% of their emitted light downward and the balance upward sometimes with a strong horizontal component are classified as

Back 32

General diffuse lighting fixtures

Front 33

Ceiling features equipped with diffusers are typically used to provide

Back 33

General diffused lighting

Front 34

Industrial fluorescent fixtures with non aperture reflectors typically direct which percentage of their lighting downwards toward the work surface

Back 34

100%

Front 35

Two identicle lowbay HID fixtures are to be mounted at a height of 18' if these fixtures have a spacing criterion of 1.5 what is the maximum distance that should exist between them to provide proper lighting

Back 35

27'

Front 36

Bollard fixtures are commonly used to like

Back 36

Walkways and grounds

Front 37

Trolley busways can be used

Back 37

In wet or damp locations if identified for such use

Front 38

How many classifications of hazardous atmospheres are listed in the NEX

Back 38

Three

Front 39

How many divisions are there for each hazard

Back 39

2

Front 40

Witch of the following are groups listed under the class to division one

Back 40

E F G

Front 41

When installing a circuit breakers in class 2 division 1 hazardous locations a

Back 41

Dust/Ignition proof enclosure must be used

Front 42

When rigid metal conduit is required in hazardous locations the thread must be cut at

Back 42

3/4 tapered per foot

Front 43

The main purpose of a Union and a conduit run is to

Back 43

Facilitate the installation and removal of equipment

Front 44

When installing switches and other arc producing apertures and class 1 division 1 location ceiling fixtures shall be installed within

Back 44

18" of the switch or other apparatus

Front 45

The purpose of packing fiber in a sealing fitting is to

Back 45

Prevent any liquids gasses or vapors from passing through the Fitting

Front 46

Which of the following best describes the time to pour in the sealing compound in a sealing fitting

Back 46

After the conduit system and seals are installed and the conductors are packing fibers have been installed

Front 47

Which of the following best describes in maximum short circuit current that a fuse or circuit breaker will safely interrupt

Back 47

AIC

Front 48

A plug fuse is typically used in a

Back 48

Branch circuit

Front 49

A 600 V fuse can be used in

Back 49

A 240 V circuit

Front 50

A type of fuse with a groove during in one ferrule is a type

Back 50

R

Front 51

Each of the following is a basic factor to consider when applying any fuse except

Back 51

Manufacturer's brand name

Front 52

For proper coordination the total clearing time of any downstream protective device must be below a curve representing which percentage of the minimum melting curve of the fuse being apply

Back 52

75%

Front 53

The minimum interrupting rating of branch circuit listed fuses is

Back 53

10000A

Front 54

The minimum voltage rating of branch circuit fuses is

Back 54

125 V

Front 55

All of the following are classifications of medium voltage fuses except

Back 55

Proportion fuses

Front 56

An expulsion fuse is best described as

Back 56

Vented fuse in which the expulsion effect of gasses produced by the Arc. And lining of the fuse holder either alone or aided by a Spring extinguishes the Arc

Front 57

The maximum fuse size for a single element non time delay fuse serving a 10 horse power 3 phase motor is

Back 57

100 A

Front 58

One characteristic of a dual element time delay fuse is that

Back 58

Provides back up protection if other protective devices fail to operate

Front 59

When a common circuit breaker trips the handle is in the

Back 59

Middle position

Front 60

A 60 app circuit breaker has a frame size of

Back 60

100A

Front 61

One circuit breakers are classified as 100 A through 2000 A frames which numbers are normally referred to as the

Back 61

Frame size

Front 62

A circuit breaker that trip instantly or fails to reset is most likely the result of

Back 62

A short circuit

Front 63

And industrial application medium voltage may refer to systems rated over

Back 63

1000V up to 38000V

Front 64

The term interrupting rating refers to

Back 64

Maximum current a device will safely interrupt at rated voltage

Front 65

Which of the following is not a general classification of circuit breaker

Back 65

Fuse circuit breaker

Front 66

A 4000 A switch board requires a minimum distance from the fase bus to the closest steel member of

Back 66

6" or 150 mm

Front 67

When an unintended path is established between an underground conductor and a ground it is called A

Back 67

Ground fault

Front 68

A transformer rated at more than 5000 KVA is considered A

Back 68

Power transformer

Front 69

The term capacity on a transformer nameplate refers to

Back 69

Its ability to transfer energy

Front 70

The term class on a transformer nameplate refers to

Back 70

The type of cooling it uses

Front 71

The secondary of a current transformer is usually designed for a rated current of

Back 71

5A

Front 72

Of the following types of current Transformers which is normally used with the circuit breaker

Back 72

Bushing

Front 73

Which of the following is a color that can be used to designate an underground conductor

Back 73

Red is the answer

Not green for ground

not white or Gray for ground circuit

Front 74

The trip rating of a circuit breaker use as the main protected device in a panel board can not exceed

Back 74

The amperage capacity of the Bush bar and the panelboard

Front 75

What type of diagram shows the actual wiring connection between unit assemblies or equipment which each wire labeled to indicate where the termination is

Back 75

Interconnection diagram

Front 76

I device that is specifically designed to protect equipment from ground faults through the use of sensors is

Back 76

Ground fault relay

Front 77

According to the IEEE identification system found in appendix a of this model if device number 51 is indicated it on an electrical print it would be

Back 77

AC time overcurrent relay

Front 78

The main purpose of a transformer is to

Back 78

Change the output voltage

Front 79

When AC flows do a transformer coil the field generate around the coil is a

Back 79

Magnetic field

Front 80

When the field from one coil cuts through the turns of a second coil

Back 80

Voltage will be generated

Front 81

What causes voltage to be induced in a transformer

Back 81

Mutual induction

Front 82

If a transformer with a turns ratio of 5 to 1 the primary has 5 times the number of turns as a secondary what will be the voltage on the secondary if the primary voltage is 120V

Back 82

24V

Front 83

The 3 basic types of iron cored transformer are

Back 83

Close core

open core

shell

Front 84

One effect caused by magnetic leakage in transformer is a

Back 84

Lower secondary voltage

Front 85

If one of the Transformers is damage in a Delta system the configuration that may be used to temporarily carry the load is called a

Back 85

Open Delta configuration

Front 86

The windings in a Auto transformer

Back 86

Share part of the warnings in common

Front 87

Most Control Transformers are

Back 87

Dry type , Step down

Front 88

The power factor of a circuit can be improved by increasing the

Back 88

Capacitance

Front 89

A dry type transformer must be housed in a vault if rated at more than

Back 89

35KV

Front 90

The symptoms of a transformer with a open circuit is

Back 90

No output on the secondary

Front 91

The meter used to measure insulation resistance is called a

Back 91

Megger

Front 92

Contactors without overload protection may be used to control

Back 92

Non inductive load

Front 93

Really contacts that are defined as being normally open (NO) have contacts that are

Back 93

Open when the relay coil is de-energized

Front 94

The voltage level at which the armature Spring of a power really overcomes the magnetic field of the coil causing the contact to change state is called the

Back 94

Dropout voltage

Front 95

IEC - rated contactors and motor starters perform the same function as equivalent nema rated Contactor and motor starters but are usually

Back 95

More application sensitive

Front 96

Replacing the contacts of a magnetic contact are you must replace

Back 96

All moving and stationary contacts for all poles

Front 97

Overload protection for motors is provided by

Back 97

And overload relay

Front 98

The least important consideration when selecting overload relays is the

Back 98

Manufacture of the motor