Code

Question 1

Can a short circuit be a ground fault OR a line to line fault?

Answer 1

yes

Question 2

are overcurrent and overload devices the same thing?

Answer 2

no

Question 3

What is the formula for short circuit current?

Answer 3

I Secondary/%IZ

Question 4

A 15A circuit breaker trips when 20A current flows through it over a period of time. Is this due to overload or overcurrent?

Answer 4

overload

Question 5

Do fuses need an interrupting rating?

Answer 5

yes

Question 6

If there is no interrupting label listed, what do we assume it is?

Answer 6

10,000 A

Question 7

What is the max current we can use plug fuses for?

Answer 7

30A

Question 8

Is it possible to use a 60A fuse holder for a 25A fuse?

Answer 8

no

Question 9

Does a dual element fuse provide a time delay?

Answer 9

yes

Question 10

Can fuses protect for both short circuit and overload?

Answer 10

yes, if they are a dual element

Question 11

Must time delay fuses be marked with TD?

Answer 11

yes

Question 12

What is the interrupting capacity of class H fuses?

Answer 12

10,000A

Question 13

Can we replace a class H fuse with a class K for a higher interrupting rating?

Answer 13

Yes, we sure can

Question 14

A circuit breaker is a manual control device as well as an overcurrent device. True or False?

Answer 14

True

Question 15

The electromagnetic component of a circuit breaker responds to what?

Answer 15

short circuits

Question 16

The Thermal component of a circuit breaker responds to what?

Answer 16

overload

Question 17

What must be put on receptacles within 1.5m of kitchen sinks?

Answer 17

Class A GFCI

Question 18

AFCI protects against series and parallel low level arcing faults. True or False?

Answer 18

True

Question 19

What two conditions must protective devices operate automatically?

Answer 19

overload and short circuit

Question 20

In a proper selectively co-ordinated system, the overcurrent device that trips first will be the:

Answer 20

branch circuit

Question 21

Can you install a circuit breaker that does not have an interrupting rating equal or greater than the available fault current of the circuit if part of a series rated combination?

Answer 21

Yes

Question 22

What are the standard sizes for disconnects?

Answer 22

30, 60, 100, 200, 400, 600,

Question 23

If in doubt, what size is our grounding conductors?

Answer 23

6AWG

Question 24

Due to inverse time characteristics, circuit breakers and fuses will open ____ when heavily overloaded and ____ when slightly overloaded

Answer 24

quickly, slowly

Question 25

What size of disconnect would be required for a 70A fuse?

Answer 25

100A

Question 26

Are kitchen counter receptacles required to be protected by an AFCI

Answer 26

fuck no

Question 27

Which electrical distribution design would have the lowest fault current?

Answer 27

Radial

Question 28

Which electrical distribution design is for residential?

Answer 28

Radial

Question 29

Which electrical distribution design would you likely find downtown?

Answer 29

Network

Question 30

What is the advantage of a network system?

Answer 30

100% up time. If you had to shut down a transformer, the clients wouldn't lose power

Question 31

What is the disadvantage of a network system?

Answer 31

Super high fault currents

Question 32

How do GFCI's work?

Answer 32

If the current leaving does not equal the current coming back, they trip

Question 33

What are two ratings that are evaluated when determining the suitability of an overcurrent?

Answer 33

continuous and interrupting

Question 34

Class H fuses are very uncommon because:

Answer 34

they have a very low interrupting rating

Question 35

Are series rated systems constructed from fuses, breakers or both?

Answer 35

breakers only

Question 36

What is an overload condition?

Answer 36

a moderately higher current than normal

Question 37

What is a short circuit condition?

Answer 37

Much, much higher current than normal

Question 38

Describe continuous rating

Answer 38

Higher than designed load for circuit

Question 39

Describe interrupting rating

Answer 39

Must be higher than the available fault current. If it is not, it will explode

Question 40

Where does current always travel back to?

Answer 40

the source

Question 41

What determines the current of the circuit?

Answer 41

the load

Question 42

What is considered an electrical source?

Answer 42

Transformers, generators, inverters, batteries, solar

Question 43

What is considered to be the ungrounded conductor?

Answer 43

the hot, line, phase a/b/c

Question 44

What is considered to be the grounded circuit conductor?

Answer 44

The neutral/identified/identified neutral/white

Question 45

What is the difference between hot sequence and cold sequence metering?

Answer 45

hot sequence = meter is on supply side | cold sequence = meter on the load side

Question 46

What are three types of grounding electrodes?

Answer 46

manufactured, field assembled, in situ

Question 47

What is an example of a manufactured grounding electrode?

Answer 47

a rod or plate

Question 48

GFCI's can be:

Answer 48

deadfronts, breakers, receptacles

Question 49

AFCI's can be:

Answer 49

deadfronts, breakers, receptacles

Question 50

What makes up a motor starter?

Answer 50

Overload and a contactor

Question 51

Which insulation class is the hottest?

Answer 51

H

Question 52

What is the hottest kind of wire?

Answer 52

SES110

Question 53

What are the overload multipliers?

Answer 53

125% for SF 1.15 and above | 115% for SF 1.14 and below

Question 54

What are some things that can be found on a motor nameplate?

Answer 54

Type, insulation class, voltage, FLA, service factor, duty, etc

Question 55

What is the supply conductor in a motor circuit?

Answer 55

The conductor between the JB and the motor

Question 56

Where does the motor supply conductor connect?

Answer 56

directly to the motor

Question 57

Is the controller considered a disconnect?

Answer 57

hell no