Article (5)
Metrological Requirements for EVSE
1. Units of Measurement:
Electrical active energy shall be expressed in one of the following units of measurement:
a. Watt-hour.
b. Kilowatt-hour.
c. Megawatt-hour.
d. Gigawatt-hour (Wh/kWh/MWh/GWh).
2. Operating Conditions:
Operating conditions shall be as specified in Schedule (1) annexed to this Resolution.
3. Accuracy Requirements:
a. General Requirements:
1) The manufacturer shall specify the accuracy class of EVSE, provided that it is one of the
following classes: (A), (B), or (C).
2) EVSE shall be designed and manufactured so that the MPE for the specified class is not
exceeded under operating conditions.
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3) EVSE shall be designed and manufactured to prevent critical failures when exposed to
the disturbances specified in the guide issued by the International Organization of
Legal Metrology (OIML G22).
b. Direction of Energy Flow:
1) Where the manufacturer specifies that EVSE is designed for bidirectional energy
flow, it shall be capable of correctly handling the mean energy flow in both positive
and negative directions and shall comply with the requirements of the guide issued
by the International Organization of Legal Metrology (OIML G22) relating to
bidirectional energy flow. The polarity of the energy flow shall be determined in
accordance with manufacturer’s wiring instructions for EVSE.
2) For alternating current AC EVSE, the mean energy flow shall refer to the sum of
instantaneous power over at least one nominal frequency cycle.
3) EVSE shall fall under at least one of the following categories:
a. Bidirectional (dual-register): Equipment capable of measuring and recording
the mean energy flow in both directions with separate registers.
b. Unidirectional (single-register – positive direction only): Equipment capable of
measuring and recording the mean energy flow in the positive direction only.
This functionality may be integrated into the design so that only positive mean
energy flow is recorded, or the equipment may be fitted with a reverse
operation prevention mechanism, provided that the manufacturer specifies
the approved method in each case.
Note: “Single-register” and “dual-register” referred to in paragraphs (a) and (b)
of this clause refer only to the main energy registers; EVSE may contain
additional registers such as those intended for storing tariff and/or phase
information.
c. Permissible Error Limits According to the Classification of EVSE:
Actual measurement errors shall be within the permissible error limits specified in the
table below for the specified current ranges when energy value is at least equal to the
Minimum Measured Quantity (MMQ) and EVSE is operated under the reference
operating conditions.
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Quantity Base maximum permissible errors (%) for
class
Current,
I Power Factor A (2%) B (1%) C (0.5%)
𝐼𝑠𝑡 ≤ 𝐼 < 𝐼𝑚𝑖𝑛 0.9 ± 25 ± 15 ± 10
𝐼𝑚𝑖𝑛 ≤ 𝐼 < 𝐼𝑡𝑟 0.9 ± 25 ± 1.5 ± 1.0
𝐼𝑡𝑟 ≤ 𝐼 < 𝐼𝑚𝑎𝑥 0.9 ± 2.0 ± 1.0 ± 0.5
Note: Electric vehicles operate in accordance with specified specifications at a power factor
greater than 0.9.
d. Permissible Limits for the Influence Factors Affecting Measurements:
The error deviation resulting from a change in each of the influence factor quantity shall
remain within the permissible error limits specified in Table (4) of the guide issued by the
International Organization of Legal Metrology (OIML G 22), provided that the reference
operating conditions for the remaining factors are maintained, as follows:
1) Temperature influence factor.
2) Self-heating.
3) Voltage variation (for alternating current charging equipment only).
4) Frequency variation (for alternating current charging equipment only).
5) Voltage and current fluctuation (for alternating current charging equipment only).
6) Phase sequence reversal (for three-phase current only).
7) Conducted disturbances (low frequency).
8) Continuous magnetic induction from an external source.
9) Alternating current magnetic field from an external source.
10) Electromagnetic field radiation.
11) Radio frequencies.
12) Auxiliary devices.
e. Permissible Disturbance Influence:
1. Electric Vehicle Supply Equipment (EVSE) shall operate in a manner that enables it
to withstand disturbances under normal operating conditions without producing
critical errors, when subjected to electrical, environmental, and mechanical
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disturbance limit tests specified in Tables (5), (6), and (7) of the guide issued by the
International Organization of Legal Metrology (OIML G 22).
2. Electric Vehicle Supply Equipment (EVSE) shall be designed to maintain sufficient
stability of its metrological characteristics throughout the reverification period
determined by the Ministry, or for a period of eight (8) years where no such period
is specified, provided that it is installed, maintained, and used correctly in
accordance with the manufacturer’s instructions and within the environmental
conditions for which it was designed.
4. Charging System Requirements
a. Markings:
1) Each Electric Vehicle Supply Equipment (EVSE) shall clearly bear the following
essential information:
a. Type approval mark.
b. Approval number or identifier.
c. Manufacturer’s name.
d. Year of manufacture.
e. Model.
f. Serial number.
g. Electrical voltage range (minimum and maximum voltage).
h. Electrical current range (starting current / minimum / transitional / maximum
current).
i. Frequency.
j. Temperature range.
k. Accuracy class.
l. Minimum Measured Quantity (MMQ).
m. Charging modes.
2) All markings shall be distinct, clearly legible, indelible, and capable of withstanding
environmental factors, particularly exposure to sunlight.
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3) Where the serial number is affixed to a detachable part, it shall also be affixed at
another location in such a manner that it cannot be separated from the parts
determining the metrological characteristics.
4) Symbols or similar markings may be used where necessary, provided that they are
acceptable to the Ministry.
b. Fitness for Use:
1) Electric Vehicle Supply Equipment (EVSE) shall comply with all requirements set out in
this Resolution, including all metrological requirements and any requirements relating
to software and the internal clock (where applicable).
2) The accuracy class shall be determined at the connection point to the vehicle.
3) For Electric Vehicle Supply Equipment (EVSE) applying a correction mechanism to
compensate for energy losses introduced by parts (such as cables), compliance with
the relevant requirements shall be verified in accordance with the guide issued by the
International Organization of Legal Metrology (OIML G22, 4.2.1.3).
5. Tariff Requirements:
a. Electric Vehicle Supply Equipment (EVSE) that enables the application of multiple
tariffs during an energy transfer session shall meet the following requirements:
1) The applied price shall not be changed during the transaction unless prior approval
has been obtained by the user through the device or through an application linked
thereto.
2) Electric Vehicle Supply Equipment (EVSE) shall be able to measure and store all
billing-related data.
3) The sum of all energy recorded in the multiple tariff registers shall be equal to the
total energy transferred during the transaction.
4) Only one register may be active at any time during the transaction.
5) The following information shall be clearly identifiable for each part of the
transaction:
a. The amount of energy transferred.
b. The time interval over which the energy was transferred.
c. The direction of energy transfer, where applicable.
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d. The unit price applied; and, in the case of multiple tariffs, such tariffs shall be
clearly visible to the customer as part of the variable pricing applied through
interaction with the Electric Vehicle Supply Equipment (EVSE).
b. In the event of a power outage, the transaction shall be temporarily suspended at the
time of the outage.
c. Upon restoration of power following a power outage affecting Electric Vehicle Supply
Equipment (EVSE), the following provisions shall apply:
1) Where the Electric Vehicle Supply Equipment (EVSE) is able to determine that it is
connected to the same vehicle before and after the power outage, charging may be
resumed without additional approval, and the ongoing transaction may be
completed normally.
2) Where the Electric Vehicle Supply Equipment (EVSE) is not able to determine that
it is connected to the same vehicle before and after the power outage, the
transaction shall be terminated at the point at which the power outage occurred.
3) Where resumption of the transaction is not possible following a power outage, all
information relating to the last transaction shall be available for a period of no less
than fifteen (15) minutes upon restoration of power.
4) The charging process may be cancelled without charging any fees to the customer,
or the Electric Vehicle Supply Equipment (EVSE) operator may complete the
transaction and charge the customer solely for the services provided up to the
moment of the power outage, provided that all requirements relating to a
completed transaction are fulfilled.
6. Access to Data:
a. The end user shall be able to access data through the data display or user interface.
b. The following requirements shall apply to all client interface:
1) Electric Vehicle Supply Equipment (EVSE) shall be able to display all data relevant
for billing purposes in a clearly readable manner.
2) The amount of energy being transferred shall be displayed either continuously or
on demand.
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3) A means shall be provided enabling the user to enter any data relevant to the
transaction.
4) For multi-tariff devices, data relating to each applied tariff, including any decimal
fractions, shall be displayed in a manner that ensures such data is not significantly
affected by exposure to Operating Conditions throughout the service life of the
charging equipment.
