3005 MEN, SELV, PELV MEN & Earthing True False Quiz

The maximum impedance of the main earth is 0.05Ω

• True

• False

The minimum size for a main earthing conductor is 2.5mm2

• True

• False

Answer explanation

The minimum size for a main earthing conductor is 4.0mm

An outbuilding that is supplied with a PEC requires a separate earth pin

• True

• False

Answer explanation

No earth pin required of the outbuilding has been supplied with a PEC (protective earhting conductor)

The acronym M.E.N. stands for “Main Earthing Neutral”

• True

• False

Answer explanation

MEN stands for "Multiple Earthed Neutral"

A galvanised steel rod used as a main earth pin must be driven 1.8m into the ground.

• True

• False

The steel ducting or conduit for cables can be used as a PEC

• True

• False

A catenary wire must be earthed and insulated.

• True

• False

Answer explanation

A catenary wire only needs to be earthed if it is not insulated.

Equipotential bonding wires must be insulated

• True

• False

Exposed conductive parts of double insulated tools are required to be earthed

• True

• False

The non-conductive reinforcing within a concrete floor of a bathroom is required to be earthed

• False

• True

Answer explanation

Conductive reinforcing needs to be earthed. It is not possible to earth non-conductive reinforcing.