Practice Questions - BS 7671: 2018

[Nigel]

Question 1:

Which of the following is not a preferred frequency as outlined in BS 7671?

(Provide Reg No)

A) 40Hz
B) 50Hz
C) 60Hz
D) 400Hz

 

[Loki]

a

110.1.2

 

[Nigel]

Question 2:

Which person makes the recommendation for the interval to the first periodic inspection and testing of an electrical installation?

(Provide Reg No)

A) The person ordering the work.
B) The designer
C) The installer
D) The person carrying out the initial verification.

 

[Loki]

134.2.2

b

 

[Nigel]

@Loki is flying.

Come on the rest of you......

 

[Nigel]

Question 3:

The maximum earth fault loop impedance for 5s disconnection time with Uo of 230v for a 160A fuse to BS 88-2 is which of the following:

(Including Reg No)

A) 0.19 ohms
B) 0.27 ohms
C) 0.33 ohms
D) 0.70 ohms

 

[telectrix]

Question 3:

The maximum earth fault loop impedance for 5s disconnection time with Uo of 230v for a 160A fuse to BS 88-2 is which of the following:

(Including Reg No)

A) 0.19 ohms
B) 0.27 ohms
C) 0.33 ohms
D) 0.70 ohms

i got that one, but would need to look up the previous ones. surprising what you forget when dementia and/or beer. kicks in,.

 

[Nigel]

i got that one, but would need to look up the previous ones. surprising what you forget when dementia and/or beer. kicks in,.

Quite interesting. I suppose the other two are not often used.

Good practice for us all these questions.

 

[telectrix]

Quite interesting. I suppose the other two are not often used.

Good practice for us all these questions.

pm'd you.

 

[Loki]

Question 3:

The maximum earth fault loop impedance for 5s disconnection time with Uo of 230v for a 160A fuse to BS 88-2 is which of the following:

(Including Reg No)

A) 0.19 ohms
B) 0.27 ohms
C) 0.33 ohms
D) 0.70 ohms

PM sent so others can have a go

 

[Nigel]

PM sent so others can have a go

Correct. Well done.

 

[Nigel]

Question 4:

Using Table 54.7 of BS 7671, what is the minimum cross-sectional area of a protective conductor to be used with a 70mm line conductor?

A) 16mm
B) 25mm
C) 35mm
D) 50mm

 

[Loki]

Question 4:

Using Table 54.7 of BS 7671, what is the minimum cross-sectional area of a protective conductor to be used with a 70mm line conductor?

A) 16mm
B) 25mm
C) 35mm
D) 50mm

PM sent

 

[Nigel]

PM sent

You are smashing it out the park.

 

[Loki]

You are smashing it out the park.

haha just miss read that reading it to quickly.
Thought it read you are smashing it out in the park lol.

 

[Sparky_Wario]

Question 3:

The maximum earth fault loop impedance for 5s disconnection time with Uo of 230v for a 160A fuse to BS 88-2 is which of the following:

(Including Reg No)

A) 0.19 ohms
B) 0.27 ohms
C) 0.33 ohms
D) 0.70 ohms

B) 0.27 ohms
Table 41.4 page 63

 

[Sparky_Wario]

Question 4:

Using Table 54.7 of BS 7671, what is the minimum cross-sectional area of a protective conductor to be used with a 70mm line conductor?

A) 16mm
B) 25mm
C) 35mm
D) 50mm

B) 25 mm table 54.8 (18th edition) page 203

 

[Sparky_Wario]

B) 25 mm table 54.8 (18th edition) page 203

I used the wrong table.

I think the answer is C) 35mm

Reg 543.1.4 page 198