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British Standards Bs 7671 Electrical Installation Exam Practice quiz 13

British Standards Bs 7671 Electrical Installation Exam Practice quiz 13

British Standards Bs 7671 Electrical Installation Exam Practice

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Quiz Questions And Answers

In a domestic dwelling a 32A ring final circuit incorporating BS 1363 socket-outlets historically serves a floor area up to

75m2
100m2
50m2
200m2

Which of the following is not a characteristic of the supply?

Nominal voltage
frequency
Earth loop impedance Ze
Power factor

The requirements for mobile or transportable units are applicable to the following types of unit

Health screening services
Pleasure craft
Mobile machinery to BS EN 60204-1
Traction equipment of electric vehicles

Basic protection by means of obstacles is intended to prevent

Ordinary persons from operating equipment
Intentional contact with exposed parts
Intentional bodily approach to a live part
Unintentional bodily approach to a live part

Which of the following is a method of fault protection?

Electrical separation
Barriers or enclosures
Insulation of live parts
Placing out of reach

The value of the external earth loop impedance Ze can be obtained by measurement at

The supply point and subtracting the value of internal loop impedance (R1 + R2)
The furthest socket-outlet from the supply
The origin of supply
both the supply and at the furthest socket-outlet, and subtracting one result from the other

In a TN system, final circuits not exceeding 32A supplying fixed equipment are subject to a maximum disconnection time of

0.4s
0.8s
4.0s
5.0s

The temperature limit for metalic equipment which is intended to be touched but not hand-held is

30 degrees Celsius
55 degrees Celsius
65 degrees Celsius
70 degrees Celsius

Overload current is defined as an overcurrent

Due to low insulation resistance
In a circuit which is electrically sound
Due to a fault of negligible impedance
In a line conductor in contact with earth

The prospective fault current at the origin of a single-phase installation is the greater of the prospective

Maximum demand and diversity value
Short circuit and overload current
Design current and distributorā€™s main fuse
Short circuit and earth fault currents
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