Radiofrequency Exposure Assessment for Wireless Products

Identify the radiating structures, users, installation and operating modes. Normal use can involve hand-held, body-worn, desktop, vehicle or fixed arrangements with different distances and conditions. Record the highest relevant output and time-averaged operation supported by the design. A separation distance written in a report should correspond to a credible product installation or use condition rather than an assumption unrelated to the equipment supplied.

Sections 2.1091 and 2.1093 define the respective equipment categories and evaluation framework. Classification depends on how the radiating structure is used relative to people, not merely whether the product can be carried. The appropriate metric and method must follow the relevant provisions. A mobile-device calculation should not be reused for a close-body portable application without examining whether its assumptions remain valid.

Section 1.1310 establishes RF exposure limits, including distinctions relevant to general-population and occupational exposure. The applicable conditions determine which category can be used. A manufacturer's professional or industrial marketing label does not automatically establish controlled occupational exposure. The file should identify the population and conditions supporting the selected limits and keep them consistent with the instructions and installation.

Section 1.1307 provides criteria for exemption from routine evaluation and an evaluation route where applicable. An exemption decision still requires a documented basis tied to the actual source and conditions. The regulation expressly distinguishes exemption from evaluation from exemption from exposure limits or equipment authorization. Preserve the calculations, parameters and assumptions needed to explain the conclusion instead of using an unqualified low-power statement.

Products containing more than one RF source can require assessment of simultaneous operation and combined exposure. Antenna placement, duty cycle, power control and user proximity can affect the result. Adding a certified module does not automatically establish conformity of the combined product. Review changes that alter these conditions before extending the original analysis to a new enclosure, accessory or software configuration.

Link the evaluation to the authorized configuration, installation restrictions and user information. Where compliance depends on separation or operational controls, ensure that the product and instructions preserve those conditions. Keep RF exposure evidence distinct from electrical or functional safety evidence. The acceptance record should explain what was evaluated and how the marketed product remains within that assessment, rather than offering a general claim of harmless radiation.