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Circuitry Final > Conductors > Flashcards

Conductors Flashcards

1
Q

Purpose of insulating conductors?

A

prevent unwanted current flow

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2
Q

Unwanted current flow can come in the form of?

A

Ground faults, short circuits, or electrical shock

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3
Q

The insulation of conductors must always satisfy certain conditions , which is?

A

Always having a temperature and voltage rating

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4
Q

What does voltage rating refer to?

A

The wires dielectric strength

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5
Q

What is temp rating?

A

Amount of heat a wire can withstand before it melts or burns

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6
Q

Rule of thumb for temp rating?

A

Every 10 degrees beyond normal rating reduces the insulation’s life by 1/2

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7
Q

What to consider when installing wire?

A

Location - moisture reduces dialectic properties

Toxic elements - can break down insulation

Anything that could cause mechanical damage

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8
Q

What is enamel?

A

Type of insulation for a conductor, 6-7 coats produce a thin layer of insulation. Used in relays, small transformers, motor windings.

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9
Q

What is varnished cambric?

A

Type of insulation for conductor. Made up of insulating tape that can be made from cloth coated in varnish.

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10
Q

What is rubber used for?

A

Type of insulation for conductor. Made from natural rubber and silicone. Used for flexibility, good for high and low temp as well as outdoor use.

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11
Q

Thermo plastics?

A

Limited use because of its problems of melting under high temp or breaking in cold

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12
Q

Polyvinylchloride (PVC)?

A

Most widely used thermoplastic. Limited to 600v cause of melting properties.

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13
Q

What are the identification letters for PVC by CSA and what do they mean?

A

I - is used for dry locations
TW - Suitable for use in wet and dry locations.
TWU - is suitable for direct burial in the ground

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14
Q

Mineral insulation?

A

Made up of a compound of chemicals such as Mica, Magnesium oxide, and asbestos. Used where high temperatures are needed

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15
Q

Mica?

A

excellent insulation but not used often

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16
Q

Asbestos?

A

Was used years ago but not used now due to health hazards. Found in older homes

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17
Q

Magnesium oxide?

A

Used where no moisture at all can get to the conductor. (fire alarm systems)

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18
Q

What is the name for mineral insulation?

A

Trade name is “Pyrotenax” —expensive

19
Q

What is the identified conductor?

A

White or grey

20
Q

What are Red Black and Blue wires considered as?

A

hot wires

21
Q

What are the 4 categories used to identify different applications of conductors?

A

Power circuit wiring

Fixture wires

Low voltage control circuits

Communication, alarm, and signal circuits

22
Q

Power circuit wiring?

A

conductors used for distribution of electrical energy within residential, commercial, and industrial buildings.

23
Q

Fixture wires?

A

used for lighting, mostly stranded wire, specified as a higher temperature equipment wire

24
Q

Communication, alarm, and signal circuits?

A

Used for extra low voltage applications

25
Q

What is type DRT cable used exclusively for?

A

range and dryer cables

26
Q

Which cable is fire-resistant?

A

MIC pyrotenax

27
Q

What is the principle use of NS cable?

A

Overhead distribution and service drops on residential properties

28
Q

What does ACWU stand for?

A

armoured cable wet underground

29
Q

What does T75 stand for?

A

thermoplastic at 75 degrees

30
Q

Which insulation is limited to 600v?

A

PVC

31
Q

What cable is used for fire alarm systems?

A

Pyrotenax

32
Q

What type of conductor is used for branch circuits?

A

Power circuit wiring

33
Q

Which type of conductor is found in a light?

A

fixture wires

34
Q

Which type of conductor used for a computer?

A

communication

35
Q

Proper name for loomex?

A

non metallic sheathed cable (NMSC)

36
Q

Proper name for BX?

A

Armoured cable (AC)

37
Q

Proper name for Corflex?

A

Aluminum sheathed cable (ASC)

38
Q

Proper name for Pyrotenax?

A

Mineral insulated cable (MIC)

39
Q

Proper name for cabtire?

A

Service entrance cable

40
Q

What voltage does corflex come in?

A

600v-5000v

41
Q

Where would you use Triplex NSC?

A

3 wire 120v/240v

42
Q

Where would you use Quadraplex NSC?

A

4 wire 120v/208v

43
Q

Where would you use “SJ” cable?

A

general service cable

Circuitry Final (5 decks)

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