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Electrician 3rd Year > Code > Flashcards

Code Flashcards

1
Q

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

A

yes

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2
Q

are overcurrent and overload devices the same thing?

A

no

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3
Q

What is the formula for short circuit current?

A

I Secondary/%IZ

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4
Q

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

A

overload

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5
Q

Do fuses need an interrupting rating?

A

yes

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6
Q

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

A

10,000 A

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7
Q

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

A

30A

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8
Q

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

A

no

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9
Q

Does a dual element fuse provide a time delay?

A

yes

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10
Q

Can fuses protect for both short circuit and overload?

A

yes, if they are a dual element

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11
Q

Must time delay fuses be marked with TD?

A

yes

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12
Q

What is the interrupting capacity of class H fuses?

A

10,000A

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13
Q

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

A

Yes, we sure can

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14
Q

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

A

True

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15
Q

The electromagnetic component of a circuit breaker responds to what?

A

short circuits

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16
Q

The Thermal component of a circuit breaker responds to what?

A

overload

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17
Q

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

A

Class A GFCI

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18
Q

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

A

True

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19
Q

What two conditions must protective devices operate automatically?

A

overload and short circuit

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20
Q

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

A

branch circuit

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21
Q

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?

A

Yes

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22
Q

What are the standard sizes for disconnects?

A

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

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23
Q

If in doubt, what size is our grounding conductors?

A

6AWG

24
Q

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

A

quickly, slowly

25
Q

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

A

100A

26
Q

Are kitchen counter receptacles required to be protected by an AFCI

A

fuck no

27
Q

Which electrical distribution design would have the lowest fault current?

A

Radial

28
Q

Which electrical distribution design is for residential?

A

Radial

29
Q

Which electrical distribution design would you likely find downtown?

A

Network

30
Q

What is the advantage of a network system?

A

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

31
Q

What is the disadvantage of a network system?

A

Super high fault currents

32
Q

How do GFCI’s work?

A

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

33
Q

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

A

continuous and interrupting

34
Q

Class H fuses are very uncommon because:

A

they have a very low interrupting rating

35
Q

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

A

breakers only

36
Q

What is an overload condition?

A

a moderately higher current than normal

37
Q

What is a short circuit condition?

A

Much, much higher current than normal

38
Q

Describe continuous rating

A

Higher than designed load for circuit

39
Q

Describe interrupting rating

A

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

40
Q

Where does current always travel back to?

A

the source

41
Q

What determines the current of the circuit?

A

the load

42
Q

What is considered an electrical source?

A

Transformers, generators, inverters, batteries, solar

43
Q

What is considered to be the ungrounded conductor?

A

the hot, line, phase a/b/c

44
Q

What is considered to be the grounded circuit conductor?

A

The neutral/identified/identified neutral/white

45
Q

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

A

hot sequence = meter is on supply side

cold sequence = meter on the load side

46
Q

What are three types of grounding electrodes?

A

manufactured, field assembled, in situ

47
Q

What is an example of a manufactured grounding electrode?

A

a rod or plate

48
Q

GFCI’s can be:

A

deadfronts, breakers, receptacles

49
Q

AFCI’s can be:

A

deadfronts, breakers, receptacles

50
Q

What makes up a motor starter?

A

Overload and a contactor

51
Q

Which insulation class is the hottest?

A

H

52
Q

What is the hottest kind of wire?

A

SES110

53
Q

What are the overload multipliers?

A

125% for SF 1.15 and above

115% for SF 1.14 and below

54
Q

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

A

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

55
Q

What is the supply conductor in a motor circuit?

A

The conductor between the JB and the motor

56
Q

Where does the motor supply conductor connect?

A

directly to the motor

57
Q

Is the controller considered a disconnect?

A

hell no

Electrician 3rd Year (6 decks)

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