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Electrical Blueprints > Intro to Electrical Control Wiring - 3 > Flashcards

Intro to Electrical Control Wiring - 3 Flashcards

1
Q

What is the function of an electrical print?

A

An electrical print is a representation of an electrical system that shows how components are connected and sometimes where they are physically located.

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2
Q

What are electrical prints for?

A

Electrical prints help troubleshooters and operators understand machine operation and locate problems.

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3
Q

What is an electrical print called when components are shown as symbols?

A

A Schematic Diagram

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4
Q

What are two common types of electrical print formats?

A

Wiring diagram and Ladder diagram

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5
Q

What is a Wiring Diagram?

A

A Wiring diagram is a schematic that shows the physical wiring connections in an electrical circuit.

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6
Q

What is a Ladder Diagram?

A

A Ladder diagram is a schematic that shows the flow of control signals via electrical current between input and output devices.

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7
Q

What does L1 and L2 represent on a Ladder diagram?

A

Power supply

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8
Q

What are Ladder diagrams used for?

A

Ladder diagrams are used to determine the sequence of operations or steps performed by the circuit.

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9
Q

What are the four primary components of a ladder diagram?

A

Power supply, Input Devices, Output Devices, Conductors

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10
Q

What should you be aware of when looking at ladder diagrams vs electrical schematic diagrams?

A

Different symbols of the same component.

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11
Q

What are the six ladder diagram rules to make them easier to read?

A
  1. Label all the components
  2. Number all Conductors
  3. Number all Rungs
  4. Only Show Control Devices
  5. Place Only One Load per Rung
  6. Place Output Devices on the right
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12
Q

Rule #4 (Only Show Control Devices): What should ladder diagrams show?

A

Control devices such as switches, solenoids, and relay.s

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13
Q

Rule #4 (Only Show Control Devices): What should ladder diagrams NOT show?

A

Ladder diagrams should not show power devices such as valves, motors, and cylinders.

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14
Q

What is a load on a ladder diagram? Pertaining to Rule #5 (Place Only One Load per Rung)

A

A load on a ladder diagram is an output device.

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15
Q

What should loads never be wired as?

A

In parallel on different rungs, or in series on the same rung.

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16
Q

What is the function of numerical cross-referencing?

A

To indicate the location and types of contacts controlled by a relay or contractor’s output coil.

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17
Q

What is cross-referencing useful for?

A

Cross-Referencing is useful for quickly locating the contacts that are controlled by an output coil when a machine print has several pages.

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18
Q

What are the function of notes on an electrical print?

A

Notes are sometimes included on the right side of the print.

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19
Q

What are the three steps to interpret a ladder diagram?

A
  1. Start at the upper left
  2. Read first line
  3. Read remaining lines
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20
Q

Large diagrams for large circuits can consist of several pages?

A

Yes.

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21
Q

Most machine electrical prints are in the form of a(n) ________ diagram.

A

Ladder.

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22
Q

________ are used on electrical prints when a device on one line of a print has contacts on other lines.

A

Cross-references

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23
Q

A ________ under a number on the right side of a print indicates a normally closed contact on another line.

A

Line.

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24
Q

________ on a print can tell you what operation is being performed by the components on that line.

A

Notes.

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25
Q

Electrical prints will include ________ at the top or bottom to indicate that it continues to or is continued from another page.

A

Arrows.

26
Q

What is NEMA (National Electrical Manufacturer’s Association) for when it comes to enclosures??

A

To designate different types of enclosures.

27
Q

Enclosures may be used in _________ or ___-_________ locations.

A

Hazardous or Non-Hazardous.

28
Q

NEMA Non-Hazardous Enclosure Types:

A

https://imgur.com/a/Q99LiMW

29
Q

NEMA Hazardous Enclosure Types:

A

https://imgur.com/a/rUx5xeH

30
Q

What are Terminals blocks used for in electrical panels?

A

To terminate wires that enter or exit the panel.

31
Q

What are Terminal blocks good for?

A

Terminal blocks make organizing and troubleshooting much easier.

32
Q

Each terminal block is a ________ circuit.

A

Separate.

33
Q

What are the three common types of terminal blocks?

A
  1. Feed-Through Terminal Block
  2. Ground Terminal Block
  3. Fused Terminal Block
34
Q

When a wire size is larger than 4 AWG, it is acceptable to run the wires directly to the ________ than through a terminal block.

A

Control devices.

35
Q

The size chosen for a terminal block is based on _______ and _______ demands of the application.

A

Voltage and Current.

36
Q

Wire gauge numbers ________ as wire size increases.

A

Decrease.

37
Q

What are the three steps to installing terminal blocks?

A
  1. Install DIN Rail
  2. Secure the Terminal Blocks
  3. Install End Anchors
38
Q

What is done to help installers and troubleshooters identify a particular wire from the electrical print?

A

Attach labels to the end of each wire with a number.

39
Q

Wire numbers attached to wires should match the wire numbers on the _____.

A

Print.

40
Q

All devices that are connected to the LEFT side of the ladder diagram use wire number _.

A

1.

41
Q

All devices that are connected to the RIGHT side of the ladder diagram use wire number _.

A

2.

42
Q

Wire numbers change after passing through any _______ ______ except a circuit protection device.

A

Control Device.

43
Q

What is an exception of adding a wire number on a ladder diagram?

A

Connection between the Motor starter coil and Overload Contacts.

44
Q

Sometimes there are a wire number between the Motor starter coil and Overload Contacts because they are ….

A

Physically connected between each other.

45
Q

Wires that run between the control panel and operator station must enter and exit the panels through what?

A

Terminal blocks.

46
Q

Wires that run between components in the same panel do not need to use the what?

A

Terminal blocks.

47
Q

Why is color coding used on wires in an electrical panels?

A

To indicate the type of signal each wire carries. Also to make it easier to install and troubleshoot electrical panels.

48
Q

What is Insulation Color BLACK description?

A

Ungrounded AC power conductors.

49
Q

What is Insulation Color RED description?

A

AC Control Circuit (typically 120 VAC).

50
Q

What is Insulation Color BLUE description?

A

DC Control Circuit.

51
Q

What is Insulation Color ORANGE description?

A

Interlock control circuits from an external power source.

52
Q

What is Insulation Color GREEN description?

A

Equipment grounding conductor.

53
Q

What is Insulation Color White description?

A

Grounded circuit conductor, DC common

54
Q

What two types of over current protection devices are there?

A

Fuses and Circuit Breakers.

55
Q

Fuses and circuit breakers must be sized _____ or _______.

A

Equal to or Greater than

56
Q

How do you install a fuse?

A

Align both ends of the fuse with the fuse holders and then push both ends of the fuse into the fuse block until it snaps into place.

57
Q

What is a safety disconnect switch used for?

A

to manually disconnect a circuit from the main power source.

58
Q

What is a non-fusible disconnect?

A

A Disconnect that has no over current protection. Typically because it is somewhere else.

59
Q

What is a fusible disconnect?

A

A Disconnect that has 1 fuse for each phase.

60
Q

Non-fusible, fusible, and, circuit breaker disconnects are sized according to what?

A

Current rating, Voltage rating, and number of phases.

Electrical Blueprints (5 decks)

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