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Federal Register / Vol. 86, No. 209 / Tuesday, November 2, 2021 / Proposed Rules
2 An external power supply that is not supplied with a wire or cord must be tested with a wire or an output cord recommended by the manufacturer.
h While external power supplies must be tested in their final, completed configuration in order to represent their measured efficiency on product labels or specification sheets, any functionality that is unrelated to the external power supply circuit may be disconnected during testing as long as the disconnection does not impact the functionality of the external power supply itself. Test the external power supply in its final configuration to the extent possible within its enclosure and with all output cords that are shipped with it. Exclude from testing devices for which the primary load of the converted voltage within the device is not delivered to a separate end use product, i.e., products in which the primary load of converted voltage is delivered within the device itself to execute the primary function of the device. Examples of excluded products may include consumer electronics with USB
outputs, and lighting products with USB
outputs.
i If a product serves one or more other major functions in addition to converting household electric current into DC current or lower-voltage AC current, components of the product that serve other functions may be
disconnected before testing so that test measurements do not include power used by other functions and as long as disconnecting such components do not affect the ability of the product to convert household electric current into DC current or lower-voltage AC
current. For example, consider a surge protector that offers outlets supplying AC
household electric current and one or more USB outputs supplying DC current. If power is provided to the AC outlets through a surge protection circuit, but power to the USB
outlets is not, then the surge protection circuit may be disconnected from AC power during testing. Similarly, if a lighted manual on-off switch disconnects power only to the AC outlets, but not the USB outputs, then the manual on-off switch may be turned off and power to the light disconnected during testing.
5. Test Measurement for all External Power Supplies other than Adaptive External Power Supplies:
a Single-Voltage External Power Supply.
1 Standby Mode and Active-Mode Measurement.
i Place in the on position any built-in switch in the UUT controlling power flow to the AC input, and note the existence of such a switch in the final test report.
ii Operate the UUT at 100% of nameplate output current for at least 30 minutes
immediately prior to conducting efficiency measurements. After this warm-up period, monitor AC input power for a period of 5
minutes to assess the stability of the UUT. If the power level does not drift by more than 5% from the maximum value observed, the UUT is considered stable. If the UUT is stable, record the measurements obtained at the end of this 5-minute period. Measure subsequent loading conditions under the same 5-minute stability parameters. Note that only one warm-up period of 30 minutes is required for each UUT at the beginning of the test procedure. If the AC input power is not stable over a 5-minute period, follow the guidelines established by section 5.3.3 of IEC
62301 for measuring average power or accumulated energy over time for both input and output.
iii Test the UUT at the nameplate output voltages at the loading conditions listed in Table 1, derated per the proportional allocation method presented in section 5a1iv of this appendix. Conduct efficiency measurements in sequence from Loading Condition 1 to Loading Condition 4
as indicated in Table 1 of this section. For Loading Condition 5, place the UUT in noload mode, disconnect any additional signal connections to the UUT, and measure input power.

TABLE 1LOADING CONDITIONS FOR UNIT UNDER TEST
Condition Condition Condition Condition Condition
1 2
3 4
5

The 2% allowance pertains to nameplate output current, not the calculated current value. For example, a UUT at Loading Condition 3 may be tested in a range from 48% to 52% of the derated output current.
A If testing of additional, optional loading conditions is desired, conduct that testing in accordance with this test procedure and
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100% of Derated Nameplate Output Current 2%.
75% of Derated Nameplate Output Current 2%.
50% of Derated Nameplate Output Current 2%.
25% of Derated Nameplate Output Current 2%.
0%.

subsequent to completing the sequence described in section 5a1iii of this appendix.
B Where the external power supply lists both an instantaneous and continuous output current, test the external power supply at the continuous condition only.

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C If an external power supply cannot sustain output at one or more of the Loading Conditions 14 as specified in Table 1 of this section, test the external power supply only at the loading conditions for which it can sustain output.
iv Use the following proportional allocation method to provide consistent
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