Goto Section: 15.205 | 15.209 | Table of Contents
Revised as of February 25, 2020
Goto Year:2019 |
§ 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)
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
(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 § 15.205, § 15.209, § 15.221, § 15.223, or
§ 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
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Goto Section: 15.205 | 15.209
Goto Year: 2019 |
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