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

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

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

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

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..

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

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

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

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

While performing a Fall of Potential Earth Electrode Resistance test, you obtain readings of 123ohms, 135ohms & 128ohms, which reading do you take

The Ka rating on an MCB is its

You measure a Ze of 0.05 ohms on a 400/230v installation, what is the minimum kA rating of the mcb you can fit for a 3 phase circuit?

You are running a submain from a 400v Distribution board (DB1) to a new 230v distribution board (DB2), you are then running the EV charger from the single phase board. The Ze at the 400v Distribution board is 0.05 ohms, the R1+R2 of your submain is 0.11 ohms, and your final circuit to the EV charger is 0.13ohms. Where must you perform a Pfc test?

While testing an Earth Electrode, it should be

You are testing a main protective bonding conductor, you should..

You are testing the R1+R2 of a CPC on a TN system protected by a 32A B type MCB which has a max ZS in BS7671 of 1.37 ohms, the expected reading on your low resistance ohm-meter will be..

You are testing the R1+R2 of a circuit, the expected reading due to length would 0.8ohms. The ambient temperature is 30c, with a correction factor of 1.04. What reading would you obtain?

You are testing the R1+R2 of conductor, the expected reading due to length would 0.8ohms. The cable is a 70c Thermoplastic, with a correction factor of 1.20 for operating temperature. With a Ze of 0.12ohms. What would it's expected Zs be when the circuit is in operation?

While carrying out a long lead test on a 30m long, 10mm main protective bonding conductor which is 1.83mohm/m, you measure the resistance of your wandering lead at 0.98ohms before it is unrolled. You null the leads and perform your test. The reading of the bonding conductor is 0.00 ohms. This is..

You measure the R1+R2 of a 20m long 2.5mm/1.5mm radial circuit and obtain a reading of 0.39ohm. Your next circuit is a 10mm/6mm radial that is 40m long. Your expected reading will be about?

You are performing an insulation resistance test on a 400v circuit, what voltage do you test at?

You are performing an insulation resistance test on a 230v circuit, what voltage do you test at?

You are performing an insulation resistance test on a 230v circuit, what is the minimum allowed reading?

You are performing an insulation resistance test on a 400v circuit, what is the minimum allowed reading?

Before performing an insulation resistance test, you should

You perform an insulation resistance test on multiple circuits connected together, you would expect..

You perform an insulation resistance test on 4 circuits between L+N in a Dis Bd, they are all 10M ohms, if you tested them all connected together in the board, your expected reading would be?

You are performing an earth fault loop test on an EV Charger, it is on a 32A B Type MCB with a max Zs of 1.37 ohms. Which reading would be acceptable?

You have performed a Zs test on a 32A EV charger and obtained a reading of 0.45 ohms. The Ze is 0.12 ohms. What is the volt drop at the EV charger?

The maximum amount of volt drop for a 230v power circuit on a public supply is..

When you are using an EV as a means of storage on a 230v system, It is recommended to limit the voltage drop between the inverter and the point of connection to the grid to..

You are testing a 61008 30mA RCD to prove it disconnects in the required time, the required time is?