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.

------------------------------------------------------------------------
                                          Conducted limit (dBmV)
  Frequency of emission (MHz)   ----------------------------------------
                                      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]