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Kevins Electrical Foundation > Types of Conductors Review > Flashcards

Types of Conductors Review Flashcards

1
Q

The resistance of a wire depends on four main factors:

A

-Natural resistance (Resistivity)
-Length of the wire
-Temperature
-Cross-sectional area of the wire

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2
Q

Resistivity is often expressed in what unit?

A

ohms/mil-foot

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3
Q

AWG is also called ______and has been used since the mid-1800s to indicate a wire’s current carrying ratings.

A

Brown & Sharpe Wire Gauge

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4
Q

The term “_____” reference wires that are up to 1 AWG.

A

gauge

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5
Q

The term “____” refers to wires that are 1/0 AWG or larger. Expressed as 0, 00, 000 & 0000

A

aught

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6
Q

Four Types of Conductor Applications are……

A
  1. Power
  2. Fixture
  3. Communication
  4. Control
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7
Q

POWER: used to distribute the electrical energy within a building. What are the two types “power” conductors we use (CEC)?

A
  1. Service wiring
  2. branch wiring
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8
Q

Service wiring: usually large “_____” cables

A

Feeder

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9
Q

Canadian Electrical Code state that the minimum conductor size permitted in house is #___AWG.

A

14

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9
Q

If you are wiring in non-combustible building, which wire/cable should you use?

A

BX cable or conduit

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10
Q

If you are wiring in combustible building, which wire/cable should you use?

A

Loomex wire

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10
Q

Under Canadian Electrical code, how many volts is considered “extra low voltage.”

A

30 volts or less

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11
Q

Some use “___” conductors to minimize the electromagnetic and capacitive interference.

A

Shielded

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12
Q

What is a shield?

A

A metallic covering which is wrapped around the conductors - this acts as a Faraday cage.

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13
Q

What is a NMSC?

A

Non-Metallic Sheathed Cable.

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14
Q

Which location should you wire NMD 90?

A

Dry location

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15
Q

What is the Mineral Insulated Cable trade name?

A

Pyrotenax

16
Q

4 main facts of Mineral Insulated Cable

A
  1. also called MI cable
  2. Has a magnesium oxide inside and a smooth copper sheath
  3. Fire resistant
  4. LWMI- light weight mineral insulated cable good up to 600Volts
17
Q

What is the purpose of sheath around the conductor?

A

To protect the conductor from penetration or damages

18
Q

Which cable should you use in residential buildings?

A

Loomex or Romex

19
Q

Which cable should you use in commercial buildings

A

BX cable or conduit

20
Q

What is another term used for FCC?

A

Under carpet cable

21
Q

what does FCC stand for?

A

Flat Copper Conductor

22
Q

Wire is insulated by dipping it in a varnish or enamel

A

Magnet wire

23
Q

The ability of a material to be rolled or hammered into thin sheets.

A

Malleability

24
Q

A mineral used for insulation and is capable of operation a very high temperature

A

Magnesium Oxide

25
Q

An insulation use where flexibility and abrasion resistance are of prime importance.

A

Rubber

26
Q

A type of insulation material that softens when heated, and conversely hardens when cooled.

A

Thermoplastic

27
Q

What is the opposite of resistance?

A

Conductance

28
Q

what is resistivity constant for copper?

A

10.4 ohm per mil-foot

29
Q

A type of insulation made by impregnating cloth with varnish.

A

Varnish Cambric

30
Q

A type of insulation that when held in a flame melts, drips and burns, but when the flame is removed, instantly self-extinguishes.

A

Flame Seal

31
Q

What is a trade name for Polyvinylchloride?

A

PVC

32
Q

The ability of a material to be drawn into a wire.

A

Ductility

33
Q

What is the resistivity of aluminum?

A

17ohm per mil-foot

34
Q

A phenomenon which may result in the connection points in a circuit losing their grip.

A

Cold Flow

35
Q

What is a main advantage of using MI cable?

A

High temperatures applications

36
Q

What is an enamel?

A
37
Q

A special type of wire used within electrical equipment such as lighting fixtures.

A

Fixture Wire

38
Q

Defined Ampacity

A

Ampacity is defined as the current in amperes a conductor can carry continuously under the condition without exceeding it temperature rating.

39
Q

The ampacity of_____-temperature conductor is greater than the ampacity of_____-temperature.

A

8 60C copper has an ampacity of 40A

High, low

For Example,
#8 90C copper has an ampacity of 55A

40
Q
A

Kevins Electrical Foundation (14 decks)

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