MEASUREMENTS AND CALCULATIONS
ANNEX IVSupplementary provisions
ANNEX IV MEASUREMENTS AND CALCULATIONS 1. For the purposes of compliance and verification of compliance with the requirements of this Regulation, measurements and calculations shall be made either using harmonised standards whose reference numbers have been published for this purpose in the Official Journal of the European Union or using other reliable, accurate and reproducible methods that take into account the generally recognised state-of-the-art methods. 2. Where a parameter is declared pursuant to Article 4 its declared value shall be used by the manufacturer, importer or authorised representative for the calculations in this Annex. 3. Without prejudice to point 1 of this Annex, measurements and calculations as part of any reliable, accurate and reproducible method used, shall be made in accordance with the following provisions: (a) Output measurements of USB Type-C and USB-PD ports of EPS shall be made at their output receptacles using for each such port a test-fixture with a Type-C plug, regardless of whether or not the EPS is supplied with a cable. A correction factor accounting for a round-trip cable resistance of 0,130 Ω shall be applied if the maximum nameplate output current of that port is not higher than 3 A, otherwise a correction factor accounting for a resistance of 0,100 Ω shall be applied. The resistance of the contact between the output receptacle and the Type-C plug of the test-fixture is included in the correction factors. (b) Output measurements of EPS at power outputs other than USB Type-C or USB-PD ports shall be made at the product-load side of the output cable supplied with the EPS by the manufacturer, its authorised representative or the importer. If the EPS is supplied with more than one cable the longest output cable shall be used. If the EPS is not supplied with a cable it must be tested with a 1 m long output copper wire or cable with a conductor cross-sectional area: (i) equal to 0,519 mm 2 (AWG 20), if I ≤ 3 A, (ii) equal to 0,653 mm 2 (AWG 19), if 3 A < I ≤ 5 A, (iii) not higher than mm 2 , if I > 5 A, where I is the maximum nameplate output current (A) at that port. For AC/AC EPS I represents the root mean square current. (c) ‘Proportional allocation method’ means a set of rules for EPS with shared capacity ports, for determining the load condition of each power output when the sum of the nameplate output power of the individual power outputs is greater than their total maximum combined output power when operated simultaneously, at a specific testing condition. The derating factor is the ratio between the total maximum combined output power and the sum of the nameplate output power of the individual power outputs of the shared capacity ports. The derated output current of each power output is the product between the derating factor and its nameplate output current. (d) If an EPS fulfils other main functions in addition to converting mains electricity into DC or AC power, components of the EPS that fulfil these functions may be disconnected or disabled before testing so that the test measurements do not include the additional power used by them, as long as disconnecting or disabling such components does not affect the power conversion ability of the EPS, and as long the housing of the EPS is closed before the test. (e) A dynamic EPS shall be tested at load conditions based only on the guaranteed power. (f) Regardless of the AC source type, the total harmonic distortion of the supply voltage of an EPS shall not exceed 2 %, up to and including the 13th harmonic. (g) For the surge test for interoperable EPS: For a Class I interoperable EPS the surge test consists of 10 alternating ± surges applied at its AC mains power connection between line and line, and line and earth (ground) respectively, in the form of combination waveforms with rise and hold times Tr/Th of 1,2/50 μs for the open circuit voltage and Tr/Th of 8/20 μs for the short circuit current, at a test level of 2,5 kV. For a Class II interoperable EPS the surge test consists of 10 alternating ± surges applied at its AC mains power connection between line and line, in the form of combination waveforms with rise and hold times Tr/Th of 1,2/50 μs for the open circuit voltage and Tr/Th of 8/20 μs for the short circuit current, at a test level of 2,5 kV. The test is considered passed if the tested unit complies after the test with the requirements in Annex II point 4. Otherwise the test is considered failed. (h) The measurement of the standby mode power consumption of wireless chargers with the power supply integrated into the same unit and of wireless charging pads connected with the EPS by a DC cable hard-wired at both ends shall be made in accordance with standardised methods of measurement of electrical power consumption in standby mode(s) for household electrical appliances. (i) The measurement of the standby mode power consumption of wireless charging pads which are not connected with the EPS by a DC cable hard-wired at both ends, shall be made in accordance with the following requirements regardless whether they are supplied or not with an EPS: (i) the device shall be measured in the condition as delivered to the end-user (factory setting) without any object placed on it; (ii) the power consumption shall be determined at the DC input. Depending on the EPS connection the measurement shall be at the receptacle or at the plug of the hard-wired power supply cable; (iii) the power source shall be able to supply the DC input voltage and power specified for the wireless charging pad; (iv) if the wireless charging pad can be powered by adaptive EPS at different DC voltages, it shall be powered by such an EPS supporting all specified voltage levels. The measurement shall be at the input voltage set by the wireless charging pad; (v) the standby mode power consumption shall be the average power determined for a duration of not less than 10 minutes. (j) If a wireless charger with the power supply integrated into the same unit or a wireless charging pad fulfils other main functions in addition to transmitting power by inductive coupling, components of the product that fulfil these functions may be disconnected or disabled before testing so that the test measurements do not include the additional power used by them, as long as disconnecting or disabling such components does not affect the power transmission ability of the product. 4. Until the publication of the references of the relevant harmonised standards in the Official Journal, use shall be made of the transitional testing methods set out in point 5, or of other reliable, accurate and reproducible methods, which take into account the generally recognised state-of-the-art methods. 5. For adaptive EPS, EPS with multiple power outputs and user-selectable EPS, the test procedure of the Department of Energy of the United States of America, laid down in Appendix Z to Subpart B of Part 430 of Title 10, Chapter II, Subchapter D of the Code of Federal Regulations, 87 FR 51221, in its version applicable on 19 August 2022, may be used as a transitional test method, using mains electricity.