What is FCC Standard?

What Are FCC Requirements?

Understanding which rules apply to a device for the US market

FCC stands for the Federal Communications Commission. It regulates communications and radio-frequency devices in the United States. “FCC standard” is a common informal expression; technically, it refers to different rules under 47 CFR rather than a single standard. For a product, the key questions are which part applies, how electromagnetic interference is limited, and which equipment authorization procedure is required.

The difference between Part 15 and Part 18

Part 15 covers RF devices that can operate without an individual radio license under the applicable conditions. Wi-Fi and Bluetooth transmitters are examples of intentional radiators. Digital electronics that generate high-frequency signals internally without intending to transmit radio communications may be classified as unintentional radiators. There is also an incidental radiator category for sources such as motors or mechanical switches that generate RF energy unintentionally during operation.

Part 18 addresses industrial, scientific and medical (ISM) equipment that generates and uses RF energy for purposes other than communications. Examples include microwave heating equipment and certain industrial process devices that use RF energy. Being used in an industrial or medical setting does not, by itself, put a device under Part 18; the purpose for which RF energy is used is decisive.

Emission assessment applies the relevant limits and measurement methods to conducted and radiated disturbances. References to CISPR 32, EN 55032, the 55014 family or the 61000 family in European reports provide useful technical context. However, whether a report satisfies FCC requirements must be checked separately.

Class A and Class B are not quality ratings

Under Part 15, Class A digital devices are marketed for commercial, industrial or business environments, excluding devices marketed to the general public or for use in the home. Class B digital devices are marketed for residential use, although they may also be used in commercial environments. Class B emission limits are generally stricter. The classification is not determined by product price or quality; intended use and how the device is marketed matter.

Certification, SDoC and FCC ID

Certification is an equipment authorization based on application information and test data. It may also be issued by a Telecommunication Certification Body (TCB) acting under FCC authority. Most intentional radio transmitters require this procedure. An FCC ID identifies equipment covered by certification.

Supplier's Declaration of Conformity (SDoC) relies on the responsible party ensuring compliance through measurements and appropriate evidence. SDoC is more than a signed document with no supporting test evidence. The required compliance information must accompany the product, and the responsible party for SDoC must be located in the United States. Equipment subject only to SDoC does not require an FCC ID; use of the FCC logo under this procedure is voluntary.

The required procedure depends on the product type, applicable rule and relevant exceptions. For certification testing, FCC recognition of the laboratory and its scope are important. ISO/IEC 17025 accreditation and FCC recognition and testing scope are distinct information that should be reviewed together.

Editor's note: The absence of an FCC ID does not indicate noncompliance when a product is subject only to SDoC. Equally, an FCC ID does not authorize every possible use of a product. Read the authorization procedure and conditions of use together.

Electrical safety and immunity require separate assessment

FCC compliance does not establish that a product has completed all safety assessments for electric shock, fire or mechanical hazards. Appropriately scoped safety certifications such as UL or ETL, along with applicable workplace requirements, may also be relevant. RF sources must also be assessed against applicable FCC requirements for human exposure to radio-frequency energy.

Noise immunity is also different from compliance with emission limits. Part 15 devices must not cause harmful interference and must accept received interference as required by the applicable rules. Meeting the limits does not guarantee interference-free operation in every installation. Following notification of harmful interference by an FCC representative, operation may have to stop until the problem is corrected.

What to check with radio modules and design changes

Installing an FCC-approved radio module in a controller does not automatically complete the assessment of the whole product. Antenna, power supply, enclosure, layout and RF exposure conditions must meet the module's approval conditions. Any required assessment of the host product's digital electronics must also be addressed.

An EMC filter, EMI filters or RFI filters can improve a design's interference performance, but adding a filter alone is not evidence of compliance. The tested product configuration must be consistent with the device being manufactured. Hardware, antenna or software changes should be reviewed for their effect on retesting and authorization requirements.

Other FCC parts and different markets

Part 22 covers public mobile services, Part 24 personal communications services (PCS), Part 25 satellite communications and Part 27 various wireless communications services. Part 68 concerns terminal equipment connected to the telephone network; Part 90 addresses private land mobile radio services; and Part 95 covers personal radio services. Equipment authorization and a service or operating license are separate matters.

CE marking and ETSI standards relate to European assessments, while RCM and the former C-Tick scheme belong to the Australian and New Zealand context. FCC compliance does not automatically satisfy requirements in these markets. Each assessment must consider the product's actual function, target market and current rules.