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College > Types And Sizes Of Enclosures > Flashcards

Types And Sizes Of Enclosures Flashcards

1
Q

What are some different types of electrical enclosures?

A
  1. Plastic enclosures.
  2. Junction boxes.
  3. Stainless steel enclosures.
  4. Galvanised adaptable boxes.
  5. Dust tight enclosures.
  6. Water tight enclosures.
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2
Q

What will effect what containment type you should use?

A
  1. If they need to have an IP rating.
  2. What cable is being used.
  3. Where the enclosure is.
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3
Q

Where is PVC conduit usually used?

A

Used mostly in commercial but can still be used in industrial.

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4
Q

What level mechanical protection does PVC conduit have?

A

Not much mechanical protection.

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5
Q

How do you bend PVC conduit?

A

By warming up the conduit to room temperature, inserting a bending spring and bending the conduit.

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6
Q

Can PVC conduit be used as the CPC?

A

No because it is not conductive.

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7
Q

What type of cable do you put in PVC conduit?

A

Single cables.

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8
Q

Can you use PVC conduit by animals (on farms)?

A

Yes but a heavy duty version must be used for more mechanical protection.

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9
Q

What are some advantages of PVC conduit?

A
  • light in weight.
  • easy to saw / cut.
  • simple to form and bend.
  • minimal condensation.
  • faster to install.
  • good electrical and fire resistance.
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10
Q

What are some disadvantages of PVC conduit?

A
  • Care must be taken when gluing joints, not too much or too little.
  • PVC expands 5 times faster than steel so you need an expansion coupler.
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11
Q

What is an expansion coupler used for?

A

To connect PVC conduit and allow for expansion when it heats up.

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12
Q

What are the different types of PVC conduit?

A
  1. Heavy gauge super high impact.
  2. Light gauge super high impact.
  3. Heavy gauge standard impact.
  4. Heavy gauge high temperature material.
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13
Q

What sizes does PVC conduit typically come in?

A

16, 20, 25, 32, 38 and 50mm in diameter.

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14
Q

What are the features of Heavy gauge super high impact PVC conduit?

A

Designed to withstand severe weather conditions and harsh site conditions.

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15
Q

Where is Light gauge super high impact PVC conduit used?

A

Suitable for pre cast and in situ concrete work.

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16
Q

Where is Heavy gauge standard impact PVC conduit used?

A

Suitable for typical conduit installations.

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17
Q

Where is Heavy gauge high temperature material PVC conduit used?

A

Suitable for installations where 80oC is expected.

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18
Q

Where is metal conduit typically usually used?

A

Commercial installations.

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19
Q

Does metal conduit have much mechanical protection?

A

Yes. Metal conduit has a high mechanical protection.

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20
Q

How is metal conduit bent?

A

Using a conduit bender.

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21
Q

Can metal conduit be used as the CPC

A

Yes because it’s conductive.

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22
Q

What do you wire metal conduit with?

A

PVC single cables.

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23
Q

What is a galvanised finish on metal conduit / trunking used for?

A

To protect against rust.

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24
Q

What is a black enamal finish on metal conduit / trunking used for?

A

General use in dry conditions.

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25
Q

Where is plastic trunking mostly used?

A

Domestic and commercial Installations.

26
Q

Does plastic trunking have much mechanical protection?

A

No. Because it’s weak.

27
Q

Is plastic trunking conductive?

A

No because it’s plastic.

28
Q

Can plastic trunking be used as the CPC?

A

No because it’s plastic.

29
Q

What do you wire plastic trunking in?

A

Sheathed cable or singles

30
Q

Where is mini trunkimg used?

A

Used mostly in domestic installations.

31
Q

What do you wire mini trunking in?

A

Usually smaller cables are installed

32
Q

Does mini trunking provide much mechanical protection?

A

No as it’s only plastic.

33
Q

Can you use mini trunking as the CPC?

A

No because it’s plastic.

34
Q

Where is metal trunking usually used?

A

Used mostly in industrial environments.

35
Q

Does metal trunking provide much mechanical protection?

A

Yes, a high level.

36
Q

Can metal trunking be used as the CPC?

A

Yes because it’s conductive.

37
Q

How is metal trunking wired?

A

With PVC singles. Can be installed within separate or single compartments.

38
Q

Can metal trunking be used to separate band 1 and 2 circuits?

A

Yes it can.

39
Q

Can plastic trunking be used to separate band 1 and band 2 circuits?

A

Only if there is multiple compartments.

40
Q

Can mini trunking be used to separate band 1 and band 2 circuits?

A

No because there is only one compartment.

41
Q

Where are cable trays usually used?

A

In overhead industrial environments.

42
Q

What cables do cable trays usually carry?

A

SWA cables.

43
Q

Why are there holes in cables trays?

A

For ventilation but it’s also used for metal cable ties.

44
Q

Do cable trays provide much mechanical protection?

A

Yes. But they are not fully enclosed.

45
Q

Where are cable baskets mostly used?

A

Usually overhead in industrial environments.

46
Q

What cable are usually put in cable baskets?

A

data and emergency cables.

47
Q

Do cable baskets provide much mechanical protection?

A

There is a medium level of mechanical protection.

48
Q

Can cable trays be used as the CPC?

A

No because it isn’t fully enclosed.

49
Q

Can cable baskets be used as the CPC?

A

No because it is not fully enclosed.

50
Q

Where are cable ladders used?

A

Industrial environments to run cables upstairs.

51
Q

What Cables are used with cable ladders?

A

usually SWA cables

52
Q

Do cable ladders have much mechanical protection?

A

There is medium levels of Mechanical protection.

53
Q

Where is cable ducting mostly used?

A

Used mostly in control panels or corrugated plastic pipes used underground.

54
Q

What is a modular wiring system used for?

A

These are plug and play systems so that anyone is able to move lights or power circuits without the need of an electrician.

55
Q

Where are bus bar systems used?

A

These are used for three phase power distribution systems.

56
Q

What is used for power in a bus bar system?

A

Solid copper bars.

57
Q

How do you maintain a bus bar system?

A

You need scheduled maintenance to maintain the mechanical connections.

58
Q

What is a power track system used for?

A

Low current applications.

59
Q

Where are lighting track systems used?

A

Usually in shops for them to slide lights around.

60
Q

Where do wagos and connector blocks need to be?

A

In an enclosure, they can’t just be stuffed into an attic.

61
Q

What do consumer units and switch gear need to be enclosed in?

A

A metal box or another non combustible material.

62
Q

What do you need to do with the edges of enclosures?

A

They must not break the IP rating and they must not have any sharp edges that can damage the cable.

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