3005 MEN, SELV, PELV 01 - MEN & Earthing 1

AS/NZS 3000:2007 states that the resistance of the main earthing conductor can be no more than how many ohms

• 0.1 Ohm

• 0.5 Ohm

• 1.0 Ohm

• 2.0 Ohms

Earthing systems are designed, in part, to make use of the _______? carrying ability of dirt.

• Resistance

• Voltage

• Current

• Moisture

The exposed __________? parts of electrical equipment shall be earthed if it is in an earthed situation

• Insulated

• Conductive

• Metal

The minimum size for a main earthing conductor is?

• 2.5mm2

• 4.0mm2

• 6.0mm2

• 10mm2

The cable that connects the main earth busbar to the earth electrode is called the _____ earthing conductor.

• Main

• Protective

• Copper

• MEN

The main earthing conductor label reads WARNING: ‘MAIN ___________ EARTHING CONDUCTOR—DO NOT DISCONNECT’.

• Building

• MEN

• Earth

• Electrical

Earth electrodes are to be installed in ground that is ______? and does not dry out.

• Moist

• Outside

• Friable

• Rocky

M.E.N. stands for ___________? earthed neutral

• Main

• Multiple

• Mainly

• Moist

The MEN system keeps the phase voltages all at a locked in value with reference to the ____? of earth

• Moistness

• Point

• Mass

• Equipotential

The mass of earth provides a very handy back up conductor for the earth wire

• True

• False