What type of Earthing system is installed here?
MEN Earthing System
Which system component is labelled with the letter 'U'
Earthed Situation
Which system component is labelled with the letter 'N'
Earthed Equipment
Which system component is labelled with the letter 'A'
MEN Link
Which system component is labelled with the letter 'F'
Protective Earthing Conductor
Which system component is labelled with the letter 'B'
Main Earthing Conductor
Which system component is labelled with the letter 'G'
Protective Earth Neutral Conductor
Which system component is labelled with the letter 'X'
Equipotential Bond
Which system component is labelled with the letter 'C'
Earthed Electrode
What is the size of main earth required for a 35mm2 copper consumer main?
10mm
What is the size of main earth required for a 6mm2 copper sub main to an outbuilding?
4mm
Section 5 deals with earthing.
True
What table is used to select the size of Protective Earthing Conductors and Main Earthing Conductors?
Table 5.1
What is the minimum size that a main earth conductor can be?
4mm
What is the minimum size earth permissible for a circuit with 1.0mm active conductors run in TPI single insulated cable in conduit?
2.5mm
What is an acceptable value of earthing conductors?
< 0.5Ω
The earth fault loop is made up from the...
Consumer main Active
Consumer main Neutral
Final sub circuit Active
Final sub circuit Earth
MEN link
Why does the Earth Fault Loop Impedance need to be low?
To ensure a large current flow in the event of a fault
Where is the main earth cable connected between?
The Earth Electrode and the Main Earth Terminal
Where is a protective earthing conductor connected between?
The Main Earth Terminal and the Conductive Switchboard Surround
What is the minimum length of a strip type earth electrode in Australia?
3 meters
These items MUST be labelled in a Main Switchboard.
Main earth electrode Location
Switchboard Terminals
The Main Switchboard itself
What are the exceptions that allow the MEN conductor to be reduced in size below that of the current carrying capacity of the consumer neutral?
Where the enclosure is earthed by a cable directly to the neutral bar
Where double insulation of the consumer mains is maintained up to the SPD
Where short circuit protection is provided on the supply side of consumer mains
What are the exceptions that allow the protective earthing conductor for a main switchboard to be reduced in size below that of the current carrying capacity of the consumer neutral?
Where double insulation of the consumer mains is maintained up to service protection device
Final Sub-Circuit and Equipotential Bonds earths must be connected to the earthing system in one of the following ways...
To the earth bar at the switchboard
To any point on the main earth conductor
What is a functional earth used for?
To ensure correct operation of electrical equipment.
A MEN connection is permissible for an individual outbuilding.
True
A MEN connection is permissible for a combined outbuilding.
False