Sec. 15.207  Conducted limits.

    (a) For an intentional radiator which 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 450 kHz to 30 MHz shall not exceed 250 microvolts. 
Compliance with this provision shall be based on the measurement of the 
radio frequency voltage between each power line and ground at the power 
terminals.
    (b) The following option may be employed if the conducted emissions 
exceed the limits in paragraph (a) of this section when measured using 
instrumentation employing a qusi-peak dectector function: If the level 
of the emission measured using thr quasi-peak instrumentation is 6 dB, 
or more, higher than the level of the same emission measured with 
intrumentation having an average detector and a 9 kHz minimum bandwidth, 
that emission is considered broadband and the level obtained with the 
quasi-peak detector may be reduced by 13 dB for comparison to the 
limits. When employing this option, the following conditions shall be 
observed:
    (1) The measuring instrumentation with the average detector shall 
employ a linear IF amplifier.
    (2) Care must be taken not to exceed the dynamic range of the 
measuring instrument when measuring an emission with a low duty cycle.
    (3) The test report required for verification or for an application 
for a grant of equipment authorization shall contain all details 
supporting the use of this option.
    (c) 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 uV within the 
frequency band 535-1705 kHz.
    (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.
    (d) 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]

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