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lecture 2 Flashcards

1
Q

What are the 9 electrical materials?

A
  1. panel board
  2. circuit breakers
  3. wires and cables
  4. conductor materials
  5. insulation materials
  6. conduit
  7. junction box
  8. sockets/outlets
  9. switch
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2
Q

_____ is an enclosure of protective devices such as circuit breakers.

A

panel board

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3
Q

____ serves as a central point where electricity is received from the main electrical supply and then divided into individual circuits for lighting, outlets, appliances, and other electrical loads.

A

panel board

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4
Q

A ____ is a safety device that protects an electric circuit from damage caused by an overcurrent or short circuit.

A

circuit breaker

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5
Q

The primary function of this device is to interrupt the current flow to shield the equipment and prevent the risk of fire.

A

circuit breaker

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6
Q

____ can be operated manually and automatically trips in case of overload and short circuit condition.

A

circuit breaker

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7
Q

MCB (5a to 40A)

A

miniature circuit breaker

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8
Q

MCCB (50A to 2500A)

A

molded case circuit breaker

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9
Q

ACB (500A to 3500A)

A

air circuit breaker

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10
Q

OCB (1000A and up)

A

oil circuit breaker

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11
Q

VCB (600A and up)

A

vacuum circuit breaker

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12
Q

SF6 (1000A and up)

A

SF6 circuit breaker

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13
Q

What are 3 wires and cables?

A
  1. wire
  2. cable
  3. bare conductor
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14
Q

conductor + insulation (small size)

A

wire

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15
Q

conductor + insulation + sheath (large size)

A

cable

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16
Q

there is no insulation

A

bare conductor

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17
Q

What is the unit for wires and cables?

A

mm^2 or AWG

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18
Q

What are 4 core of cables?

A
  1. single-core cable
  2. 2-core cable
  3. 3-core cable
  4. 4-core cable
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19
Q

What are 2 conductor materials?

A
  1. copper wire
  2. aluminum wire
20
Q

What are 2 insulation materials?

A
  1. PVC insulation wires
  2. cross-linked polyethylene (XLPE)
21
Q

____ is widely used type of insulation material, inexpensive.

A

PVC insulation wires

22
Q

PVC insulation wires has an operating temeprature ranges from _____ to _____ deg C.

23
Q

____ is commonly used for building wiring, power distribution, and telecommunications.

A

PVC insulation wires

24
Q

____ is excellent high temperature resistance.

A

cross-linked polyethylene (XLPE)

25
____ is used in medium and high-voltage power cables.
cross-linked polyethylene (XLPE)
26
What are the 5 color codes of cable?
1. phase A (red) 2. phase B (yellow) 3. phase C (blue) 4. neutral (black) 5. earth/ground (green)
27
____ is a plastic or metal piper where electrical wires are running.
conduit
28
____ protects the wires and cables from damage.
conduit
29
What are 4 kinds of conduit?
1. rigid PVC conduit 2. electrical non-metallic tubing (ENT) 3. flexible metal conduit (FMC) 4. rigid metal conduit (RMC)
30
____ is usually used inside the wall, slabs, and floor screed.
rigid PVC conduit
31
____ can be bent by being heated.
rigid PVC conduit
32
_____ is a flexible corrugated plastic-type of tubing.
electrical non-metallic tubing (ENT)
33
_____ has a spiral construction and applicable to area that require close quarters and tighter bends.
flexible metal conduit (FMC)
34
____ is heavyweight galvanized steel that is installed using threaded fittings.
rigid metal conduit (RMC)
35
____ is costly because it offers additional strength and durability.
rigid metal conduit (RMC)
36
What are 5 standard sizes of conduits?
1. 1/2 in 2. 3/4 in 3. 1 in 4. 1 1/4 in 5. 2 in
37
____ is an electrical junctional box is an enclosure or container designed to house and protect electrical connections, wiring, and components.
junction box
38
What are the 2 kinds of juntion box?
1. octagonal junction box 2. back boc
39
A ____, also commonly referred to as an electrical socket or receptacle.
electrical outlet
40
_____ is a device that provides a point of connection for electrical appliances and decies to access electrical power.
sockets/outlet
41
What are 5 kinds of sockets/outlet?
1. parallel outlet 2. parallel outlet with grounding 3. universal outlet 4. two-way outler 5. two-way outlet with grounding
42
An ____ is a device that is used to interrupt or control the flow of electrical current in an electrical circuit.
electrical switch
43
_____ are designed to provide a means for users to control the operation of lighting, appliances, machinery, and various electrical loads.
switches
44
What are the 6 standard ratings of switch?
1. 5A 2. 10A 3. 15A 4. 20A 5. 25A 6. 30A
45
____ represents the number of switch in a back box.
gang
46
What are the 3 kinds of gang?
1. 1 gang 2. 2 gang 3. 3 gang

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