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FCC Part 15 Radio Frequency Devices
Section 15.207

The Federal Communications Commission (FCC) is the authority in the United States of America that creates and enforces the use of airwaves throughout the entire radio frequency spectrum. This group of documents contains the entirety of the FCC Part 15 regulations that concern unlicensed radio frequency devices. As with all government documents, this material is in the public domain and may be freely copied so long as the content is not changed. This copy is provided as a convenience for RF Cafe visitors. 

Click here for the Table of Contents.

[Code of Federal Regulations]
[Title 47, Volume 1]
[Revised as of October 1, 2008]
From the U.S. Government Printing Office via GPO Access
[CITE: 47CFR15.207]
[Page 804-805]
                       TITLE 47--TELECOMMUNICATION
                     Subpart C_Intentional Radiators
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 [mu]H/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 (dB[mu]V)
  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.
[[Page 805]]
    (2) For all other carrier current systems: 1000 [mu]V within the 
frequency band 535-1705 kHz, as measured using a 50 [mu]H/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]

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