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FCC Part 15 Radio Frequency Devices
Section 15.107

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: 47CFR15.107]
[Page 769]
 
                       TITLE 47--TELECOMMUNICATION
 
              CHAPTER I--FEDERAL COMMUNICATIONS COMMISSION
 
PART 15_RADIO FREQUENCY DEVICES--Table of Contents
 
                    Subpart B_Unintentional Radiators
 
Sec. 15.107  Conducted limits.
    (a) Except for Class A digital devices, for equipment 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 band edges.
------------------------------------------------------------------------
                                        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) For a Class A digital device 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 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.......................  79.................  66
0.5-30.........................  73.................  60
------------------------------------------------------------------------
 
    (c) The limits shown in paragraphs (a) and (b) of this section shall 
not apply to carrier current systems operating as unintentional 
radiators on frequencies below 30 MHz. In lieu thereof, these carrier 
current systems shall be subject to the following standards:
    (1) For carrier current systems 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 [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. 15.109(e).
    (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 provision for, the use of battery chargers which 
permit operating while charging, AC adaptors or battery eliminators or 
that connect to the AC power lines indirectly, obtaining 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 57 FR 33448, July 29, 1992; 
58 FR 51249, Oct. 1, 1993; 66 FR 19098, Apr. 13, 2001; 67 FR 45670, July 
10, 2002]



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