What is FCC Part 15B?

Part 15B is an electromagnetic compatibility (EMC) testing standard established by the U.S. Federal Communications Commission (fcc) regarding Unintentional Radiators. Simply put, it tests the electromagnetic radiation inadvertently generated by electronic devices during operation, ensuring that this radiation does not interfere with other radio communication services.

Scope of Application

It includes non-wireless electronic products such as household appliances (e.g., refrigerators, washing machines), IT equipment (e.g., computers, printers), and audio/video equipment (e.g., televisions, speakers). Although these devices do not actively transmit wireless signals, they must ensure that their electromagnetic radiation does not cause interference with other devices.

Core Requirements

Limit the electromagnetic interference (EMI) generated by the device, ensure its radiation level complies with the limits stipulated by the FCC, and avoid causing harmful interference to surrounding radio communications or other electronic devices.

Certification Method

Adopting the fcc sdoc (Supplier's Declaration of Conformity) mode, enterprises must complete product testing themselves, draft a declaration of conformity after ensuring compliance with the standards, and keep technical documents on file for inspection, without requiring direct review by the FCC.

Test Items

They primarily include conducted emissions (150kHz–30MHz frequency band) and radiated emissions (30MHz–1GHz or higher frequency bands; some products need to be tested up to 40GHz). The test results must comply with the limits stipulated by the FCC.

Test Purposes

• Protect Public Communications: Prevent electronic devices from interfering with normal communications such as television, radio, and mobile phones.

• Product Compliance: Passing the test is a mandatory requirement for products to enter the U.S. market.

Differences Between Part 15B and Part 15C

fcc part 15 is divided into multiple subparts, the most common being B and C:

Part 15B

Targets unintentional radiators and controls the spurious interference they generate.

Products or devices include:

• Non-wireless A/V products and home appliances: Televisions, radios, mini audio systems, DVDs, MP3 players, etc.

• Non-wireless IT products: Personal computers, mice, monitors, digital cameras.

• Non-wireless commercial equipment: Corded phones, fax machines, office computers, etc.

Part 15C

Targets intentional radiators, namely devices that actively transmit radio signals. It not only limits interference but also specifies parameters such as transmission power and frequency.

Products or devices include:

• Radio-controlled toys, telephones, radio receiving and transmitting equipment, communication terminal equipment, etc.