Practice Questions - BS 7671: 2018

[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