EV charging exam practice questions

Q1. A domestic 7.4 kW wall-mounted charge point with a Type 2 outlet and integral control pilot is which charging mode?

• a)Mode 1
• b)Mode 2
• c)Mode 3
• d)Mode 4

Q2. A rapid charger supplying the vehicle battery directly with direct current, with the converter in the charging unit, is:

• a)Mode 1
• b)Mode 2
• c)Mode 3
• d)Mode 4

Q3. 'Case C' connection means:

• a)The cable is permanently attached to the vehicle
• b)The cable is permanently attached (tethered) to the charging station
• c)The user supplies a detachable cable with a plug at both ends
• d)Charging through a standard 13 A socket-outlet

Q4. What is the maximum rated current of a single-phase Type 2 AC charging connection at 230 V nominal, as commonly installed domestically?

• a)13 A
• b)16 A
• c)32 A
• d)63 A

Q1. Why does BS 7671 restrict connecting a vehicle's exposed-conductive-part to a PME (TN-C-S) earth?

• a)PME earths have too high a loop impedance for 30 mA RCDs
• b)A broken PEN conductor can raise the earthed metalwork, and the vehicle body, to a dangerous potential relative to true earth
• c)PME supplies cannot carry the additional load of a charge point
• d)The DNO does not permit any outdoor equipment on a PME supply

Q2. Which of the following is NOT a permitted means of complying with 722.411.4.1 on a PME supply?

• a)A charge point with integral PEN-fault (open-PEN) detection that disconnects all live conductors and the protective conductor
• b)Providing a TT earth electrode arrangement for the charging equipment
• c)Increasing the main protective bonding conductor to 25 mm²
• d)Arranging the installation so the vehicle cannot be simultaneously accessible with exposed- or extraneous-conductive-parts of the PME installation

Q3. A TT earth electrode is installed for the charge point on an otherwise PME property. What matters most about its position?

• a)It must be within 1 m of the consumer unit
• b)It must be kept far enough from the PME-earthed metalwork that the two earths do not interact
• c)It must be inside the building envelope
• d)It must be bonded to the incoming water pipe

Q4. Where a TT arrangement supplies the charge point, the earth electrode resistance Ra should be such that:

• a)Ra × IΔn does not exceed 50 V, with a value low enough to be stable — commonly 200 Ω or less for a 30 mA RCD
• b)Ra does not exceed 1 Ω
• c)Ra does not exceed 1667 Ω in all cases
• d)Ra is irrelevant once an RCD is fitted

Q5. On a supply confirmed as TN-S, open-PEN protection is:

• a)Always required
• b)Not required, because there is no combined PEN conductor in the supply
• c)Required only above 32 A
• d)Required only where solar PV is present

Q1. Each charge point connection point must be protected by an RCD of at least:

• a)Type AC, 100 mA
• b)Type A, 30 mA, with additional protection against smooth DC residual current
• c)Type B, 300 mA
• d)Type F, 30 mA, with no DC provision

Q2. A charge point datasheet states it contains a 6 mA DC fault detection device to BS EN 62955. What upstream RCD is acceptable?

• a)Type AC 30 mA
• b)Type A 30 mA
• c)Type B 30 mA only
• d)No RCD at all

Q3. How many charge point connection points may be supplied by one final circuit?

• a)One
• b)Two
• c)Up to four if each is individually fused
• d)Any number below 32 A total

Q4. A charge point is rated 32 A and will run at full load for hours at a time. When applying diversity to the installation's maximum demand, the charge point is taken as:

• a)40 % of rating
• b)66 % of rating
• c)100 % of rating — no diversity
• d)10 A plus 30 % of the remainder

Q5. The assessed maximum demand with the new charge point included comes out at 74 A on a single-phase supply with an 80 A cut-out fuse. The correct action is:

• a)Proceed — it is below the fuse rating
• b)Inform the DNO before proceeding, and agree any load-limiting or curtailment arrangement with them
• c)Fit a 100 A main switch and proceed
• d)Reduce the charge point to 16 A and proceed without notification

Q6. An outdoor charge point circuit is buried in a domestic garden. Minimum acceptable arrangement is:

• a)Twin and earth clipped to a fence at 300 mm
• b)Cable suitable for the conditions, adequately protected against mechanical damage, buried at sufficient depth with marker tape — typically armoured cable at 500 mm, deeper under a drive
• c)Any cable in plastic conduit at 150 mm
• d)Flexible cord in a duct at any depth

Q7. A socket-outlet complying with BS 1363 is used as an EV connection point. Which statement is correct?

• a)It must be labelled for EV use and protected as an EV circuit under Section 722
• b)It is exempt from Section 722 because it is a standard socket
• c)It may be supplied from an existing ring final circuit
• d)It requires no RCD protection

Q1. Which test result confirms the effectiveness of the charge point's integral RCD on a 30 mA device at 1×IΔn?

• a)Must operate within 40 ms
• b)Must operate within 300 ms
• c)Must not operate at all
• d)Must operate within 2 s

Q2. Before energising a new charge point circuit, the continuity of the protective conductor is verified by:

• a)A visual check of the terminal
• b)A dead test — R1+R2 or the wander lead method — before the circuit is made live
• c)Measuring Zs only
• d)An insulation resistance test at 500 V

Q3. Which certificate is issued for a new dedicated charge point circuit added to an existing installation?

• a)Minor Electrical Installation Works Certificate
• b)Electrical Installation Certificate
• c)Electrical Installation Condition Report
• d)No certificate is required if the charge point is plug-in

Q4. The customer handover pack for a domestic charge point should include:

• a)The certificate only
• b)Certificate, manufacturer's instructions and warranty, records of any TT electrode and its test values, notification/Part P details, and instructions on the smart and load-limiting settings
• c)Verbal instructions on how to plug the car in
• d)The DNO application only

Q5. An open-PEN detection device inside a charge point disconnects. What has it most likely detected?

• a)Excessive earth leakage current
• b)A line-to-neutral voltage outside its permitted window, indicating a lost supply neutral
• c)DC residual current above 6 mA
• d)An arc fault in the vehicle lead