3005 MEN, SELV, PELV 03 - MEN Refresher questions 2

Reason One for low Earth Fault Loop Impedance is ...

• It reduces the amount of voltage that would flow through a person if there is an earth fault

• It provides for low PSCC which means its safer for persons and property

• It reduces the amount of current that would flow through a person if there is an earth fault

• It ensures that most of the current would flow through a person instead of the PEC

Reason two for Low Earth Fault Loop impedance is ...

• Large amounts of phase and neutral current will flow and cause the protection device to disconnect the faulty circuit quickly

• Large amounts of earth fault voltage will flow and cause the protection device to disconnect the faulty circuit quickly

• Large amounts of earth fault current will flow and cause the protection device to connect the faulty circuit quickly

• Large amounts of earth fault current will flow and cause the protection device to disconnect the faulty circuit quickly

A person who receives a shock of about 20mA for 400ms will usually get no _______ physiological effects but may feel ______ contraction

A tunnel type connection on a neutral or earth bar must either have two screws or a screw diameter not less than __% of the ______ diameter

The main earthing and equipotential bonding conductors need to be tested and the result of the test must be less than ___ ohms

The maximum resistance of a PEC is dependant on the type and rating of the __________ _____ and the impedance of the live conductors that comprise the circuit.

The __________ __________ test is checking tha the unsulation between the conductors in the installation is intact.

________ testing is completed to ensure there are no incorrect connections of the active, neutral and earthing conductors

The maximum earth fault loop impedance permitted on a 230v circuit with a C type 16 Amp MCB is how many ohms?

• 5.11

• 3.07

• 1.92

• 1.53

The maximum earth fault loop impedance permitted on a 230v circuit with a C type 50 Amp MCB is how many ohms?

• 0.96

• 0.77

• 0.61

• 0.49