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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
Where is plastic trunking mostly used?
Domestic and commercial Installations.
26
Does plastic trunking have much mechanical protection?
No. Because it’s weak.
27
Is plastic trunking conductive?
No because it’s plastic.
28
Can plastic trunking be used as the CPC?
No because it’s plastic.
29
What do you wire plastic trunking in?
Sheathed cable or singles
30
Where is mini trunkimg used?
Used mostly in domestic installations.
31
What do you wire mini trunking in?
Usually smaller cables are installed
32
Does mini trunking provide much mechanical protection?
No as it’s only plastic.
33
Can you use mini trunking as the CPC?
No because it’s plastic.
34
Where is metal trunking usually used?
Used mostly in industrial environments.
35
Does metal trunking provide much mechanical protection?
Yes, a high level.
36
Can metal trunking be used as the CPC?
Yes because it’s conductive.
37
How is metal trunking wired?
With PVC singles. Can be installed within separate or single compartments.
38
Can metal trunking be used to separate band 1 and 2 circuits?
Yes it can.
39
Can plastic trunking be used to separate band 1 and band 2 circuits?
Only if there is multiple compartments.
40
Can mini trunking be used to separate band 1 and band 2 circuits?
No because there is only one compartment.
41
Where are cable trays usually used?
In overhead industrial environments.
42
What cables do cable trays usually carry?
SWA cables.
43
Why are there holes in cables trays?
For ventilation but it’s also used for metal cable ties.
44
Do cable trays provide much mechanical protection?
Yes. But they are not fully enclosed.
45
Where are cable baskets mostly used?
Usually overhead in industrial environments.
46
What cable are usually put in cable baskets?
data and emergency cables.
47
Do cable baskets provide much mechanical protection?
There is a medium level of mechanical protection.
48
Can cable trays be used as the CPC?
No because it isn’t fully enclosed.
49
Can cable baskets be used as the CPC?
No because it is not fully enclosed.
50
Where are cable ladders used?
Industrial environments to run cables upstairs.
51
What Cables are used with cable ladders?
usually SWA cables
52
Do cable ladders have much mechanical protection?
There is medium levels of Mechanical protection.
53
Where is cable ducting mostly used?
Used mostly in control panels or corrugated plastic pipes used underground.
54
What is a modular wiring system used for?
These are plug and play systems so that anyone is able to move lights or power circuits without the need of an electrician.
55
Where are bus bar systems used?
These are used for three phase power distribution systems.
56
What is used for power in a bus bar system?
Solid copper bars.
57
How do you maintain a bus bar system?
You need scheduled maintenance to maintain the mechanical connections.
58
What is a power track system used for?
Low current applications.
59
Where are lighting track systems used?
Usually in shops for them to slide lights around.
60
Where do wagos and connector blocks need to be?
In an enclosure, they can’t just be stuffed into an attic.
61
What do consumer units and switch gear need to be enclosed in?
A metal box or another non combustible material.
62
What do you need to do with the edges of enclosures?
They must not break the IP rating and they must not have any sharp edges that can damage the cable.

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