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8.2 Insulation resistance testing
8.2.1 Testing the insulation resistance of the electrical
installation supplying the charging station
Note: Before starting the test, the charger should be
disconnected from the power supply.
The test should be conducted in three- or five-wire mode, depending
on the type of installation. It is recommended to use insulation re-
sistance measuring equipment that has a valid calibration certificate.
The meter can be connected, for example, to the output terminals of
the overcurrent switch located in the distribution board.
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8.2.2 Insulation resistance testing of the charging station
Measurement combinations
PE- PE- PE-
L1 L2 L3
You can also check the insulation resistance in the station head. The
procedure is the same as in the case of the previous measurement,
which means that the voltage should be disconnected and the five-
-wire mode should be used. It is necessary to use devices designed for
insulation resistance measurements having a current calibration cer-
tificate. The maximum test voltage is 500 VDC. Insulation resistance
must not be less than 1 MΩ, and typically exceeds 100 MΩ.
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8.2.4 Protection against electric shock in TT systems
In TT systems, where loop impedance is high, an RCD can be used as
the sole means of protection against electric shock, in accordance with
standard PN-HD 60364-6:2016 "Low-voltage electrical installations –
Part 6: Verification."
If the charging station has its own protective devices, it is worth con-
sidering an additional RCD at the beginning of the cable line, ensuring
selectivity of protection measures.
8.3.1 RCD Tests
The RCD switch always disconnects charger's power supply, so after each ac-
tivation of this protection measure, the charging process must be restarted.
To perform the test, you need to:
• Ensure access to RCD protection;
• Turn on the station;
• Connect the RCD tester to the vehicle simulator;
• Using the simulator, start the charging process (the LED indicator slowly
pulsates in green);
• Follow the instructions of the RCD tester;
• After each RCD operation, re-engage it, and then begin the charging pro-
cess.
The process should be repeated until the meter completes the measure-
ment. Measurement of actual RCD sensitivity:
RCDA = 0.35IΔn ≤ IΔr ≤ 1.4IΔn
RCDB = 0.5IΔn ≤ IΔr ≤ 2IΔn
where IΔn = 30 mA – device rated sensitivity
Camera tripping time measurement: Normalised, maximum tripping times
[s] for residual-current circuit breakers, RCDA:
N- L1- L1- L2- N-
PE L2 L3 L3 L1
Green-yellow earthing conductor (C)
L1 brown (D)
L2 black (E)
L3 grey (F)
Neutral wire (blue) (G)
The measurement should be carried
out using a meter
allowing work on circuits with an RCD
switch.
8.2.3
Impedance loop measurements can be conducted at the supply junc-
tion or at the energy meter terminals, if present. It is also possible to
perform the test in the charging socket using a suitable tester that
allows the charging process to be initiated.
Another option is to use a measuring device equipped with a function
allowing measurement in a circuit equipped with a residual-current
device without tripping the device. It is necessary to check whether
the fault current at the measurement point will be sufficient to trip
the overcurrent protection within the required time. Another option
is to use a measuring device equipped with a function that allows me-
asurement in a circuit equipped with a residual current device without
triggering the operation of the device. For the assessment of protec-
tion effectiveness, take the most favourable result. Requirement to
N- N-
meet the condition:
L2 L3
8.3
Each Lenergizee station is equipped with an RCMU detector. Thanks to
this, the device is protected on two levels:
• Outside the charging station, in the switchboard, an RCD type A
protecting against AC leakage current and rectified single-phase cu-
rrent should be installed. The device disconnects the power from the
station.
• Inside the station, there is a RCMU DC detector, triggered by a cu-
rrent exceeding 6 mA. This protection measure interrupts charging
the vehicle.
• The two above-mentioned measures ensure compliance with safety
requirements outlined in the above standard. Special attention should
be paid to the names of the devices. The protection test can be con-
ducted when the charging test begins – the voltage is applied to the
charging socket – C status. For this purpose, an appropriate residual
current circuit breaker tester and vehicle simulator/adapter should be
used. RCD and RCMU are tested separately, the sensitivity of protec-
tion and their response time are examined.
IΔn 2IΔn
0.3 0.15
Normalised, maximum tripping times [s]
for residual-current circuit breakers, RCDB:
2IΔn 4IΔn
0.3 0.15
On the RCD switch, you should also confirm the operation of the
"TEST" button with the voltage on and the charging process initiated.
Pressing the button should result in deactivating the RDC protection,
meaning disconnecting the power and changing the lever position to
Off or 0.
Measurement of effectiveness of electric shock protection
Note: The measurement should be carried out in accordance with
the standard: PNHD 60364-6:2016-07, PN-HD 60364-4-41:2017
for all phases supplying the charging point.
Testing the operation of residual-current
devices
Note: According to the standard PN-EN IEC 61851-1:2019-10, each
charging point must be protected against type B residual current
(AC, rectified single-phase, and DC).
5Δn IΔn ≤ 5A
0.04 0.04
10Δn IΔn ≤ 5A
0.04 0.04
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