EV Charging testing

The earthing arrangement that should not be used for EV charging equipment outdoors without special equipment is..

• TN-C-S

• TN-S

• TT

The maximum expected Ze of a TN-C-S system is..

• 0.35 ohms

• 3.5 ohms

• 0.8 ohms

• 21 ohms

The maximum expected Ze of a TN-S system is..

• 0.35 ohms

• 0.8 ohms

• 8 ohms

• 21 ohms

The maximum Ra of an Earth Electrode in a TT system before it is classed as unstable is..

• 21 ohms

• 200 ohms

• 13.5 ohms

• 0.8 ohms

You are installing an EV Charger outdoors and the sheath of the public supply cable is used as the means of earthing for the installation, what type of protection do you fit

• a 30mA RCD

• a PEN fault protection device, type A 30mA RCD

• PEN fault protection device, type B 30ma RCD

• PEN fault protection device, RDC-DD

You obtain a reading of 5 ohms on a TT system main earth electrode, the minimum size RCD required to protect the supply to the EV charger is..

• 100mA

• 300mA

• 30mA

• 10A

You install an Earth Electrode for an EV charger, which method do you use to test it?

• E1 Fall of Potential method

• E2 Stakeless or Probe

• E3 Earth Fault Loop tester

You are testing an existing Earth Electrode on a TT system protected by an RCD, which test method do you use?

• E1- Fall of Potential Method

• E2- Stakeless or Probe

• E3- Earth Fault Loop Tester

You are performing an Earth Electrode Resistance test, from left to right, where do you install the electrodes?

• Earth electrode-

  Current Electrode-

  Potential Electrode-

• Current Electrode-

  Earth Electrode-

  Potential Electrode-

• Earth Electrode-

  Potential Electrode-

  Current Electrode-

You are performing an Earth Electrode Resistance test, how far do you move the potential electrode from the centre on tests 2 and 3?

• 5% left, 5% right

• 10% left, 20% left

• 10% left, 10% right