US Market Electronics Compliance from China
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Selling electronics into the US from China centers on two marks: FCC for radio and EMC (Part 15 SDoC for unintentional radiators, full TCB certification for wireless), and UL for product safety. Modular approval matters in practice — using a pre-certified ESP32 or nRF52 module lets you inherit its FCC grant instead of running a costly full-radiated test from scratch. UL adds the safety layer, with chargers tested to UL 62368-1.
When you source for the US from China, the two failure modes are an intentional radiator shipped without a TCB grant, and a forged UL file number. We confirm the FCC ID is live in the FCC database and the UL file matches the product before goods leave the factory.
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FAQ
Do I need both FCC and UL to sell electronics in the US?
FCC is legally required for anything that emits RF or could cause EMC interference. UL is not federally mandated but is demanded by retailers, marketplaces, and insurers, so in practice most products need both.
Can I reuse a module's FCC certification?
Yes. A pre-certified wireless module (ESP32, nRF52) carries a modular FCC grant you can inherit, provided you follow the module's integration and antenna conditions. This avoids a full intentional-radiator test.
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