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Electrical Ballocks > Design > Flashcards

Design Flashcards

1
Q

What is the minimum lux level for escape routes in public environments?

A

1 lux

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2
Q

What is a maintained light?

A

A light that is used as a normal light and emergency lighting

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3
Q

What is a non-maintained light?

A

A light that is not used, unless in an emergency

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4
Q

What areas require emergency lighting?

A

Hallways of a HMO
Inside a public room
Escape stair cases
Changing height/direction of an emergency escape route

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5
Q

During an emergency, what lux must stairwells be?

A

A minimum of 2 lux

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6
Q

What is a distribution circuit?

A

From transformer to consumer unit

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7
Q

What is a final circuit?

A

From consumer unit to accessory

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8
Q

What is basic protection?

A

Covering live parts

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9
Q

What is fault protection?

A

Earthing, bonding and ADS

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10
Q

What is additional protection?

A

RCD’s, RCBO’s

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11
Q

What is the max ZE for a TT system?

A

21 ohms/ 200 ohms is unstable and needs RCD protection of 1667 mA

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12
Q

What is the max ZE of a TN-S system?

A

0.8 ohms

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13
Q

What is the max ZE of a TN-C-S system?

A

0.35 ohms

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14
Q

What is the earth in a TT system?

A

An earth electrode in the ground

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15
Q

What is the earth in a TN-S system?

A

In an old installation - lead sheathing
In a new installation - steel wired armouring

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16
Q

What is the earth in a TN-C-S system?

A

A connected neutral wire

17
Q

What needs to be on all bonded extraneous and conductive live parts?

A

A BS 951 tag (safety electrical connection, do not remove)

18
Q

What is overcurrent?

A

A current exceeding the rated value. For conductors the rated value is the ccc

19
Q

What is an example of overcurrent?

A

Using a 45A cooker on a 20A breaker

20
Q

What is overload?

A

An overcurrent occurring in an electrically sound circuit

21
Q

What is short circuit?

A

Ab overcurrent resulting from a fault of negligible Impedance between live conductors with a potential difference under boreal operating conditions

22
Q

What is an earth fault?

A

A current occurring between a live conductor and an exposed-conductive part or protective conductor

23
Q

What is an example of overload?

A

A motor-driven conveyor having an additional load to be moved

24
Q

What colour is a BS 3036 5A fuse? (Re-wireable)

A

White

25
Q

What colour is a BS 3036 15A fuse? (Re-wireable)

A

Blue

26
Q

What colour is a BS 3036 30A fuse? (Re-wireable)

A

Red

27
Q

What is ADS used for?

A

Protection against the effects of earth fault current

28
Q

What are the tests for 3-phase safe isolation?

A

N/L¹ N/L² N/L³
E/L¹ L/R² L/R³
L¹/L² L¹/L³ L³/L²
N/E

Electrical Ballocks (4 decks)

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