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ELX > A1 LT13 > Flashcards

A1 LT13 Flashcards

1
Q

What happens if too much heat is present in a circuit application?

A

Insulation may melt or burn

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2
Q

What is cambric known for?

A

Hygroscopic and absorbs moisture.

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3
Q

Why should insulation be appropriate for its location?

A

Moisture and toxic elements can cause insulation deterioration

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4
Q

What are the types of rubber commonly used as insulation?

A

Natural rubber and silicone-based rubber.

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5
Q

What is a material used in a strong, moisture-proof sheath for carrying heavier current?

A

Copper

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6
Q

What are rubber compounds used for?

A

Flexibility and abrasion resistance

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7
Q

Why does most electrical wiring circuits look complicated?

A

Multiple wires at any one point

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8
Q

What characteristics must be kept in mind when using cables?

A

Cold flow, warmer plastic flows faster

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9
Q

How are conductors marked for identification?

A

Coloured insulation or labelled marker

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10
Q

How does high temperatures affect insulation life expectancy?

A

Reduced by one-half for every 10C beyond normal rating

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11
Q

How can polyvinylchloride (PVC) be identified?

A

Flame test - melts, drips, burns, self-extinguishes

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12
Q

What does a green wire indicate?

A

Bonding conductor

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13
Q

What is the operation voltage limit for PVC insulation according to the Code?

A

600 V AC

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14
Q

What do red, black, or blue wires typically indicate?

A

Live or hot

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15
Q

What is the maximum conductor temperature allowed for PVC insulation?

A

60C

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16
Q

What is the surface marking for cross-linked polyethylene as required by the Code?

A

XLPE or X LINK

17
Q

What happens to thermosetting materials when they are heated?

A

They harden

18
Q

What properties are improved in thermosetting materials when they harden?

A

Electrical, thermal, mechanical

19
Q

What is mica used for?

A

High temperature applications like toasters and irons.

20
Q

Which colours are reserved for specific applications according to the Canadian Electrical Code?

A

White or natural grey

21
Q

What are some applications of enamel as an insulating material?

A

Meter coils, transformers, motor windings

22
Q

What are thermoplastic materials’ properties when heated?

A

Soften

23
Q

In what cases does a white wire not indicate a neutral conductor?

A

Switch loops

24
Q

What happens to thermoplastic materials when they cool?

A

Harden

25
Q

What are some trade names for PVC?

A

Flameseal, Flamenol

26
Q

Which PVC insulation type is suitable for direct burial in the ground?

A

TWU

27
Q

How is cross-linked polyethylene affected by cold once installed?

A

Not affected

28
Q

What does a white wire indicate in a circuit?

A

Neutral conductor

29
Q

What happens if you stretch cambric insulation too tightly?

A

Varnish film may be broken or weakened.

ELX (55 decks)

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