Your device finished its testing. In the configuration section of the report, the AC adapter is listed by model, and the setup photos show it plugged into the unit. Two months later your sales team lists the same adapter as a spare part on your own webstore, and the first serious buyer replies with a question the device report cannot answer: please send the compliance documents for the adapter itself.
This feels like it should have a simple answer - "it was already tested" - and it does not, because the adapter that ships inside your box and the adapter sold on its own product page are two different compliance cases. Which one applies depends entirely on how the item reaches the customer.
The short answer
Compliance obligations attach to what is placed on the market, not to what is packed in a carton.
- Adapter in the box only. It is part of a configuration. Your device's report and declaration describe the device, and the adapter appears as auxiliary equipment - named, but not the item under test. Nothing separate is required, as long as the adapter is never offered on its own.
- Adapter offered for sale on its own. A spare-part listing, a replacement SKU, an upsell on the product page. From the moment it can be bought separately, it is a product in its own right. Products need their own compliance evidence, their own declaration, and a responsible party who signs it - regardless of the fact that the identical model was tested as part of a larger device.
The distinction is not paperwork for its own sake. When the adapter is sold alone, the buyer is relying on the adapter itself to be safe and non-interfering. The tests your device went through measured the pair working together; they were not designed to demonstrate the adapter's standalone compliance.
Why the device report cannot stretch to cover the separate sale
A report describes the item that was tested. Your device's report says: this configuration - this device, with this adapter, these cables - was tested against these standards, and these were the results. The adapter is inside that sentence, but the subject of the sentence is the device.
Three consequences follow, and each one shows up in real rejections:
- The report's item under test is the device. A vendor-onboarding team at a retail chain, or a marketplace compliance review, reads the identification page first. When the document they asked for is for the adapter, a report whose specimen is a different product does not pass - even though the adapter's model appears in the configuration table.
- The adapter was tested as part of a system. EMC emissions were measured with the adapter feeding your device; radio tests ran with the adapter powering the transmitter. Nothing in that data shows how the adapter behaves on its own, feeding someone else's device or idling on its own standby circuitry.
- The device's declaration of conformity identifies the device. There is no declaration anywhere in the file that names the adapter as the product being declared. Buyers who ask for an accessory "certificate" usually mean the report plus declaration pair - and neither exists for the accessory alone. That distinction between the documents is worth being clear on before you answer them.
How you sell it decides what you need
| How the accessory reaches the customer | What it is in regulatory terms | What evidence is needed |
|---|---|---|
| In the box only, never offered separately | Part of the device's tested configuration | The device's report and DoC, with the accessory model named in the configuration |
| In the box, plus sold as its own SKU under your brand | Two separate placements of goods | Device documents as they are, plus the accessory's own evidence and a DoC in your name |
| Sold only on its own (spares, replacements) | A product in its own right | Full own evidence per market and its own DoC; factory documents can be reused where they genuinely fit |
| Plain cable with no active electronics | Generally not an apparatus subject to EMC emission testing | No emission test as a rule, but buyers still ask for construction and material documentation |
What "its own report" means, market by market
An AC adapter or charger sold on its own is not a grey-zone product. It is one of the most clearly regulated categories there is, because it connects to the mains.
European Union. The adapter is apparatus with a direct function, so the EMC Directive (2014/30/EU) applies, and because its input sits within the Low Voltage Directive range of 50-1000 V AC, the LVD (2014/35/EU) applies too, alongside RoHS. The evidence set is a test report per applicable standard, a declaration of conformity naming the adapter, and a technical file kept for ten years. Whoever places the adapter on the market under their own brand signs that declaration - more on that below.
United States. A mains adapter is an unintentional radiator under FCC Part 15 Subpart B, normally handled through the Supplier's Declaration of Conformity route rather than an FCC ID. Separately from federal law, when a charger or power adapter is listed on its own on the US marketplace, Amazon asks for a safety report to UL 62368-1 - the standard that replaced UL 60950-1 at the end of 2020 - issued by an accredited laboratory.
Radio accessories. A replacement remote control, a USB Bluetooth dongle, a wireless charging pad: once these are sold as products, they carry the same radio requirements as any wireless device - radio equipment rules in the EU, certification with an FCC ID in the US. A radio accessory is the case where "it was tested with my device" is furthest from enough, because the radio evaluation belongs to the accessory itself.
United Kingdom. The same logic applies under UKCA, module by module, with the UK's own declaration and responsible-party requirements.
Three situations we see repeatedly
The distributor who onboarded your device wants per-SKU documents. Your adapter ships in the box and has never had a file of its own. The retail chain's vendor system requires a report and declaration per SKU. The device report is submitted, rejected, and the listing deadline moves closer. The fix is real testing of the adapter against its own standards - there is no administrative shortcut, because the evidence genuinely does not exist yet.
The marketplace listing for the replacement adapter is suspended. A compliance notice asks for safety documentation for the adapter as a listed product. The bundle certification does not satisfy the request, and stock is already sitting in the fulfilment centre. This is the most expensive version of the problem, because the evidence has to be produced under time pressure with the product already in the market.
The "same" accessory is not actually the same across markets. The adapter shipping with your EU devices has a Type C plug and a 230 V input; the version offered as a spare in the US has a Type A plug and a 120 V input. These are two different products with two different configurations. A report for one does not describe the other - a point that applies equally to the configuration you send for testing.
When you genuinely do not need new testing
Separately sold does not always mean tested from zero. The most common shortcut is a legitimate one: the adapter's own factory already had the adapter certified on its own, because it sells that adapter to other customers. In that case you need the adapter's own report, its own declaration, and a check that the tested configuration matches what you are selling - the same three checks that apply to reusing a supplier's test report.
If the factory's report is current, covers the exact adapter model and configuration you ship, and the factory is willing to support the file, you can build your compliance position on it without retesting. If the report is old, or the adapter has since been redesigned - a new PCB, a USB-C Power Delivery upgrade, a different enclosure - the report no longer describes the product, and the position is the same as if no report existed.
Who signs the declaration for the accessory
If you sell the accessory under your own brand, you are its manufacturer in the regulatory sense, even though a factory in another country makes it. The declaration of conformity for the adapter carries your name, and the technical file obligation sits with you. This surprises brands that assumed the factory "holds the certification" - the factory may hold the report, but the declaration for a product placed on the market under your brand is yours to sign.
If instead you import a factory-branded adapter and resell it unchanged, your role is closer to that of a distributor or importer, with its own set of obligations - different, but not zero.
When we would tell you not to list the accessory yet
- No evidence exists and the factory cannot provide any. Hold the listing until the accessory's own testing is done. A listing suspended after the first compliance check costs more than the report would have.
- Only one market version is documented. If the EU-plug adapter has a report and the US-plug version does not, the US spare-part listing waits.
- The adapter changed since its report. A redesign invalidates the old evidence; the new configuration needs its own evaluation before it becomes a standalone SKU.
- You have no way to be the responsible party in that market. If you cannot sign the declaration or appoint the required representative, you are not ready to place the accessory on that market - and that is a company-structure problem, not a paperwork problem.
What this comes down to
An accessory sold separately is a product. The box it used to ship in does not carry its compliance with it. Whether you need new testing depends on whether evidence for the accessory as its own product already exists somewhere - your own file, or the factory's - and whether that evidence still describes the adapter you are selling today. Check that before the listing goes live; it is the cheapest moment to find out.
We test adapters, chargers and other accessories as standalone products, and we review factory documents and provide EMC, RF and safety testing for accessories sold on their own. When a buyer's document request arrives for an accessory you have only ever shipped in a box, send us the accessory model and the market - we will tell you whether an existing report can carry it, or what a fresh scope would involve.
Send the list of accessories you plan to sell separately, the markets for each, and whether they currently ship only in the box. We will tell you which of them are already covered by an existing report, which need their own evidence, and what can be reused from your factory's documents.