3005 MEN, SELV, PELV 03 - MEN Refresher questions 1

Under the M.E.N system the ________ conductor of the distribution system is earthed at the source of supply and at regular intervals through out the system.

In an electrical installation there may be more than one set of neutral and earth busbars but there is only one particular set that takes the role of the ____ earth and neutral bars.

The M.E.N link is of electrical significance and where it is installed in the installation has a specific name to identify it. It is the the "___ _____ of the installation.

A __________ ________ _________ is any earthing conductor other than the a main earthing conductor that is used to connect any part of the electrical installation to the earthing system.

The rise in touch voltage is only limited by the total _________ of the "earth fault loop"

The mean instantaneous triping current of a "C type" circuit breaker is ___ times the rated curreent of the circuit breaker.

In a circuit breaker the ________ field caused by high in rush current of a short circuit or a massive overload forces the iron armature to immediately overcome the opposing force and quickly trip the breaker.

An RCD (Residual Current Device) monitors the balance of _______ between the phase and neutral conductors.

The mass of earth provides a very handy backup conductor for the _______ wire.

RCD's are designed to operate within 300ms thus meeting the requirement of the standard which specifies ___ms