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Federal Register / Vol. 86, No. 209 / Tuesday, November 2, 2021 / Proposed Rules
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where In is the RMS value of the nth harmonic of the current signal.
Unit under test UUT is the external power supply being tested.
USB Power Delivery USBPD EPS
means an adaptive EPS that utilizes a USB
Type-C output port and uses a digital protocol to communicate between the EPS
and the end-user product to automatically switch between any output voltage within the range of 3.3 volts to 20 volts. The USB
PD output bus must be capable of delivering 3 amps at the lowest output voltage, and the currents must not exceed any of the following values for the supported voltages:
3 amps at 9 volts; 3 amps at 15 volts, and;
5 amps at 20 volts.
USB Type-C means the reversible 24-pin physical USB connector system that supports USBPD and allows for the transmission of data and power between compatible USB
products.
4. Test Apparatus and General Instructions a Any power measurements recorded, as well as any power measurement equipment utilized for testing, shall conform to the uncertainty and resolution specifications in section 4.4.1, Power measurement uncertainty, as well as Annexes B, Notes on the measurement of low power modes, and D, Determination of uncertainty of measurement, of IEC 62301.
b Carry out tests in a room that has an air speed close to the unit under test UUT
of 0.5 m/s. Maintain ambient temperature at 20 5 C throughout the test. Do not intentionally cool the UUT, for example, by use of separately powered fans, air conditioners, or heat sinks. Test the UUT on a thermally non-conductive surface. Products intended for outdoor use may be tested at additional temperatures, provided those are in addition to the conditions specified and are noted in a separate section on the test report.
c If the UUT is intended for operation on AC line-voltage input in the United States, test it at 115 V at 60 Hz. If the UUT is intended for operation on AC line-voltage input but cannot be operated at 115 V at 60
Hz, do not test it. Ensure the input voltage is within 1% of the above specified voltage and the input frequency is within 1% of the specified frequency.
d The input voltage source must be capable of delivering at least 10 times the nameplate input power of the UUT as is specified in IEEE 15152000. Regardless of the AC source type, the THD of the supply voltage when supplying the UUT in the specified mode must not exceed 2%, up to and including the 13th harmonic. The peak value of the test voltage must be within 1.34
and 1.49 multiplied by its RMS value.

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e Select all leads used in the test set-up with appropriate wire gauges and lengths to minimize voltage drops across the wires during testing. See Table B.2Commonly used values for wire gages sic and related voltage drops in IEEE 15152000 for further guidance.
f Test Load. To load the power supply to produce all active-mode loading conditions, use passive loads, such as rheostats, or active loads, such as electronic loads. Resistive loads need not be measured precisely with an ohmmeter; simply adjust a variable resistor to the point where the ammeter confirms that the desired percentage of nameplate output current is flowing. For electronic loads, adjust the desired output current in constant current mode rather than adjusting the required output power in constant power mode.
g1 Test the external power supply at the end of the wire or cord that connects to an end-use product, regardless of whether the end of the wire or cord is integrated into an end-use product or plugs into and out of an end-use product. If a separate wire or cord is provided by the manufacturer to connect the external power supply to an end-use product, use this wire or cord and perform tests at the end of the cord that connects to an end-use product. If the connection to an end-use product is removable, there are two options for connecting metering equipment to the output connection of the external power supply:
i Cut the cord immediately adjacent to the output connector, or ii Attach leads and measure the efficiency from the output connector itself. If the connection to an end-use product is not removable, cut the cord immediately adjacent to the powered product and connect measurement probes at that point. Connect any additional metering equipment such as voltmeters and/or ammeters used in conjunction with resistive or electronic loads directly to the end of the output cable of the UUT. Conduct the tests on the sets of output wires that constitute the output busses. If the product has more than two output wires, including those wires that are necessary for controlling the product, the manufacturer must supply a connection diagram or test fixture that will allow the testing laboratory to put the UUT into active-mode. Figure 1 of this section provides one illustration of how to set up a single-voltage external power supply for testing; however, the actual test setup may vary pursuant to the type of external power supply being tested and the requirements of this appendix.

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the manufacturers label on the power supply housing or, if absent from the housing, as specified in documentation provided by the manufacturer. For an adaptive external power supply with USBPD ports, the nameplate output power is the product of its lowest nameplate output voltage and 2 amps for each USBPD port and as specified on the manufacturers label or documentation at the highest voltage.
Nameplate output voltage means the voltage output of the power supply as specified on the manufacturers label on the power supply housing either DC or AC.
No-load mode means the mode of operation when an external power supply is connected to the main electricity supply and the output is or all outputs are for a multiple-voltage external power supply not connected to a load or loads for a multiple-voltage external power supply.
Off-mode is the condition, applicable only to units with manual on-off switches, in which the external power supply is:
1 Connected to the main electricity supply;
2 The output is not connected to any load; and 3 All manual on-off switches are turned off.
Output bus means any of the outputs of the power supply to which loads can be connected and from which power can be drawn, as opposed to signal connections used for communication.
RMS means root mean square.
Single-voltage external ACAC power supply means an external power supply that is designed to convert line voltage AC input into lower voltage AC output and is able to convert to only one AC output voltage at a time.
Standby mode means the condition in which the external power supply is in noload mode and, for external power supplies with manual on-off switches, all such switches are turned on.
Switch-selectable single voltage external power supply means a single-voltage ACAC
or ACDC power supply that allows users to choose from more than one output voltage.
Total harmonic distortion THD, expressed as a percentage, is the RMS value of an AC signal after the fundamental component is removed and interharmonic components are ignored, divided by the RMS
value of the fundamental component. THD of current is defined as:

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