Earthing

Question 1

Which end of the armour of an SWA cable is to be earthed?

Answer 1

End adjacent to switchboard/accessory from where the cable originates.

Question 2

An earthing conductor made off in a terminal, and taped, is an acceptable method when using loop-at-the-switch method of wiring lighting circuits. True or False?

Answer 2

True

Question 3

An earth electrode may be driven into dry soil as long as it’s at least 1000mm, True or False?

Answer 3

False. Must maintain effective contact with moist soil that is not subject to drying out.

Question 4

Separating an earth electrode from other buried service’s conductive enclosures is done to reduce _____ _____.

Answer 4

Electrolytic action

Question 5

Exposed parts of a luminaire are to be earthed where earthing of equipment is not required, True or False?

Answer 5

True

Question 6

Which table is used to determine the minimum size of earthing conductor?

Answer 6

Table 5.1

Question 7

Earthing the non-current carrying metal parts of an electrical installation is referred to as what?

Answer 7

Equipotential bonding