FCC Part 15B generally addresses unintentional radiators: digital devices that generate radio-frequency energy internally but do not intentionally transmit it. Examples include computers, power supplies with digital control, display products, and many wired electronic devices. These products are commonly evaluated through Supplier’s Declaration of Conformity (SDoC), although the exact pathway depends on device type and rule classification.
FCC Part 15C addresses many intentional radiators, including common low-power transmitters such as Bluetooth, Wi-Fi, Zigbee, remote controls, wireless sensors, and certain proprietary radios operating in unlicensed bands. Intentional radiators generally require FCC certification through an FCC-recognized Telecommunication Certification Body (TCB).
A wireless product often falls under both categories. The transmitter is evaluated under the applicable intentional-radiator rules, while the host electronics may also require Part 15B testing. A complete compliance plan must account for the radio, host digital circuitry, power adapters, accessories, and all normal operating modes.
The classification decision affects the test plan, documentation package, product labeling, responsible-party obligations, and timing. Identifying the applicable rule parts early prevents unnecessary retesting and helps avoid a product launch based on the wrong authorization pathway.
APEX CS practical takeaway: Confirm the product-specific regulatory pathway before production, testing, labeling, or shipment. Requirements vary by device design, intended use, claims, market channel, and final configuration.