The only device connected to the ac mains is the inverter. That would probably
be tested on a C63.4-compliant test fixture. I am not sure whether they would
use a panel and optimizer or simulate them with a supplied voltage. The
inverter would be connected to a LISN grounded to the ground plane that is part
of the test fixture, typically with 3 feet of AC wiring.
If they tested in-situ, the LISN would still be connected to the inverter with
about 3 feet of wiring, so pickup would be minimal. From the S-meter readings,
these systems operate at a radiated level that is at least 10 dB below the
levels that would be permitted for an intentional emitter or carrier-current
system, so it is my estimation that any noise radiated by the system and then
picked up on 3-feet of AC mains would be below the conducted-emissions limits.
Ed Hare, W1RFI
From: RFI <email@example.com> On Behalf Of Tony
Sent: Wednesday, December 18, 2019 4:04 AM
To: Rfi List <firstname.lastname@example.org>
Subject: [RFI] Question: Conducted vs. Radiated Emissions
I have a question regarding FCC limits on conducted emissions that relates to
If a solar panel system produces electromagnetic energy that finds its way onto
the mains and then onto the power lines which then radiates over the air, that
device would be subject to the limits imposed on conducted emissions.
If the same solar panel system radiates the same energy over the air through
the cables that make up the system without reaching the mains, FCC regulations
would not apply since there are no limits on radiated emissions.
In a situation where both cases produced the same high level of RFI, what
course of action would the FCC take? Would they simply dismiss the radiated
emissions case and enforce the conductive case simply because of route the
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