Sec.  15.207   Conducted limits.

   (a)  Except as shown in paragraphs (b) and (c) of this section, for an
   intentional radiator that is designed to be connected to the public utility
   (AC) power line, the radio frequency voltage that is conducted back onto the
   AC power line on any frequency or frequencies, within the band 150 kHz to 30
   MHz, shall not exceed the limits in the following table, as measured using a
   50 μH/50 ohms line impedance stabilization network (LISN). Compliance with
   the provisions of this paragraph shall be based on the measurement of the
   radio frequency voltage between each power line and ground at the power
   terminal. The lower limit applies at the boundary between the frequency
   ranges.
   Frequency of emission (MHz) Conducted limit (dBμV)
                               Quasi-peak   Average
   0.15–0.5                    66 to 56*  56 to 46*
   0.5–5                       56         46
   5–30                        60         50

   *Decreases with the logarithm of the frequency.

   (b) The limit shown in paragraph (a) of this section shall not apply to
   carrier current systems operating as intentional radiators on frequencies
   below  30 MHz. In lieu thereof, these carrier current systems shall be
   subject to the following standards:

   (1) For carrier current system containing their fundamental emission within
   the frequency band 535–1705 kHz and intended to be received using a standard
   AM broadcast receiver: no limit on conducted emissions.

   (2) For all other carrier current systems: 1000 μV within the frequency band
   535–1705 kHz, as measured using a 50 μH/50 ohms LISN.

   (3) Carrier current systems operating below 30 MHz are also subject to the
   radiated emission limits in  Sec. 15.205,  Sec. 15.209,  Sec. 15.221,  Sec. 15.223, or  Sec. 15.227,
   as appropriate.

   (c) Measurements to demonstrate compliance with the conducted limits are not
   required for devices which only employ battery power for operation and which
   do not operate from the AC power lines or contain provisions for operation
   while  connected  to the AC power lines. Devices that include, or make
   provisions for, the use of battery chargers which permit operating while
   charging, AC adapters or battery eliminators or that connect to the AC power
   lines indirectly, obtainig their power through another device which is
   connected to the AC power lines, shall be tested to demonstrate compliance
   with the conducted limits.

   [ 54 FR 17714 , Apr. 25, 1989, as amended at  56 FR 373 , Jan. 4, 1991;  57 FR 33448 , July 29, 1992;  58 FR 51249 , Oct. 1, 1993;  67 FR 45671 , July 10, 2002]