Wireless charging complicates US compliance because the product both transfers power inductively and contains electronics that switch. The framework treats inductive equipment under a specific part of the rules, and the rest of the product under the general provisions.
This article explains the distinction, the questions it raises for a product team, and the evidence to keep.
Which FCC rules apply to a wireless charger?
Part 18 with Part 15 elements.
Inductive charging equipment falls under the industrial, scientific and medical equipment provisions, while the product’s other electronics follow the general radio frequency device rules.
The industrial, scientific and medical provisions govern equipment that uses radio frequency energy for non-communication purposes, which is what inductive power transfer is (47 CFR Part 18). The general provisions cover unintentional radiators such as control electronics and switching supplies (47 CFR Part 15).
In practice, a wireless charging product is assessed against both, and the test plan should say which provision each measurement addresses.
How the two paths differ in practice
The difference matters for the test plan, the limits applied and the labelling. Treating a wireless charger purely as a Part 15 device usually produces a report that does not address the inductive transfer, while treating it purely as an ISM device omits the electronics.
| Aspect | Part 18 considerations | Part 15 considerations |
|---|---|---|
| Scope | Inductive power transfer | Control electronics and switching supply |
| Test focus | Field strength and emissions from the transfer | Conducted and radiated emissions |
| Typical evidence | Measurements around the coil assembly | Emissions testing of the electronics |
| Labelling | Statement appropriate to the equipment | Statement appropriate to the device |
RF exposure questions
Exposure assessment depends on the field strength and on how close a person is to the source, which for a charging pad means the normal use position rather than a worst-case one. The assessment belongs in the compliance file with the measurement conditions recorded.
Where a product combines inductive charging with a radio function such as a wireless link, the assessment has to cover both, and the test plan should identify which measurement addresses which function.
Test report contents and laboratory selection
A useful report names the model, describes the test setup, states the limits applied and records the measured values with their conditions. Where a product family shares a platform, the report should explain which configurations were tested and why the untested ones are covered.
Laboratory selection follows the same logic as for other EMC work: an accredited facility with experience of inductive products, and a scope that covers the provisions being tested.
Labelling and user manual statements
Labelling requirements differ between the two provisions, and the user manual carries statements that are not on the label. For a magnetic charging product, the manual also carries the practical instructions about case thickness and object placement, which are useful for support as well as for compliance.
Where a product is sold with an adapter, the adapter has its own compliance position, and the artwork has to reflect both.
Certification versus supplier declaration
Some equipment requires certification through a recognised body, while other categories may be authorised through a supplier’s declaration of conformity. The applicable route depends on the equipment category, so it should be confirmed rather than assumed from a similar product.
Getting the route wrong is expensive in time rather than in testing, because the measurements may be reusable while the authorisation process restarts.
Timeline and cost planning
The two practical variables are the test scope and the authorisation route. A programme that plans both early can reuse measurements from a platform across models, which is why a product line built on one coil design certifies more cheaply than a line of unrelated designs.
WECENT builds wireless charging platforms within its wireless charger range, with sampling, certification planning and batch traceability handled through the OEM/ODM programme, and per-batch inspection records from the quality control gates; the platform range is listed in the product catalogue. Qi-related certification is handled through the Wireless Power Consortium programme in parallel (Wireless Power Consortium) rather than through the EMC route.
What to keep in the compliance file
Keep the test reports with their scope and conditions, the authorisation documentation, the labelling artwork and the batch record for the shipped units. Together they answer a market surveillance query or a retail compliance request without a new test programme.
Transit performance for the packaging can be validated separately against a published protocol (ISTA), so the file ends up covering emissions, safety and packaging in one place.
Programmes in this area are decided by documentation as much as by hardware. The practical discipline is to keep one file per model containing the specification, the test and inspection records and the market documents, and to review it whenever the bill of materials or the production site changes. WECENT produces per-batch inspection records at its quality control gates and provides model-level specifications and certification planning through its OEM/ODM programme, with the platform range listed in the product catalogue.
For wireless charging EMC documentation, the same file answers most questions that arise during qualification, audit or listing review: which standard applies, which model was tested, and which batch the shipped units came from. Reference documents for the relevant requirements are published by the standards and regulatory bodies, including the official text and the related requirement, with the equivalent market rule and https://www.ista.org/ applying where the product is sold into those markets.
Two further habits keep the file usable over time. The first is to record the review date and the reviewer against each document, so that an outdated report is visible rather than assumed current. The second is to keep the commercial documents – quotation, agreed specification and packaging artwork – in the same folder as the technical evidence, because a question about a shipped unit usually requires both.
A further point concerns the production reality behind the paperwork. Claims that survive scrutiny are the ones a factory can reproduce batch after batch, which means the specification, the test method and the acceptance criteria have to travel together with the order. Where they do not, the same product can be built to two different understandings of the same document.
Finally, buyers should decide in advance what evidence they will need if a question arises later, and request it at the sampling stage rather than after the shipment. Requesting records retrospectively is possible, but it is slower and it removes the opportunity to correct a specification before tooling. WECENT supports programmes with model-level specifications and per-batch inspection records produced at its quality control gates, available under NDA through its OEM/ODM programme, with the platform range listed in its product catalogue catalogue.
FAQ
Is a wireless charger tested under FCC Part 18?
Inductive charging equipment falls under the industrial, scientific and medical provisions for the power transfer, while the product’s other electronics follow the general radio frequency device rules. A complete assessment usually addresses both.
Does a wireless charger need certification or a declaration?
The applicable authorisation route depends on the equipment category. Confirming the route before testing prevents a situation where measurements are reusable but the authorisation process has to restart.
How is RF exposure assessed for a charging pad?
By measuring field strength and relating it to the normal use position rather than a worst-case one, with the conditions recorded in the report. Products that also include a radio function need the assessment to cover both functions.
What should a test report contain?
The model, the test setup, the limits applied and the measured values with their conditions, plus an explanation of which configurations were tested and why others are covered by the platform.
How does Qi certification relate to FCC compliance?
They are separate paths. The EMC authorisation covers emissions and the product’s electronics, while the Qi programme addresses the inductive charging function itself, and both belong in the product’s compliance file.
Developing a wireless charging product?
Share the product format, target channels and markets, and WECENT will confirm the test scope, certification route and documentation available for the programme.
