Testing Lab of Power Supply/ IT / AV Products

Switching power supplies shipped to North America or listed on Amazon US commonly need UL 62368-1 safety compliance. This guide explains the process, documentation, cost and timeline factors, and marketplace risks in plain language.Anci Lab supports power supply makers with UL testing from sample submission to certification.

What is UL certification for switching power supplies

UL (Underwriters Laboratories) is a widely recognized North American safety system. Switching power supplies are generally evaluated to UL 62368-1 (safety for AV, IT and communication equipment); some classes may reference UL 1310 or UL 1012. UL recognition helps products enter the North American market.

Common products　open-frame, enclosed, DIN-rail, and desktop switching power supplies

Core standard　UL 62368-1 as primary; UL 1310 / UL 1012 for specific classes

Switching power supply UL certification process

1. 1Define model specs: input/output rating, insulation class, and enclosure material.
2. 2Design review: check creepage, clearance, and protection circuits against the standard.
3. 3Sample testing: submit representative samples for safety tests.
4. 4Run safety tests: dielectric strength, temperature rise, abnormal conditions, fire enclosure.
5. 5Follow-up inspection and certification: UL programs typically include follow-up factory inspection.

Documents you need to prepare

• Product specification and nameplate parameters
• Schematic, PCB layout, and critical component list
• Enclosure and insulation material flame-rating data
• Representative samples
• Company documents and power of attorney (if applicable)

What drives the certification cost

UL cost depends on power rating, output class, and number of test items. Anci power supply UL certification Pre-design review, corrective support, and follow-up inspection arrangements also affect the total. Share the spec sheet for a tailored quote.

What drives the timeline

Timeline is set by sample compliance, document completeness, and test rounds. Products designed with insulation and thermal margin pass faster; temperature-rise or dielectric failures need extra verification. Plan ahead with buffer time.

Cross-border marketplace and export risk

Amazon US often asks for a UL report or UL recognition for power supplies; missing it blocks listing. Beyond UL, the US also requires FCC EMC compliance. Anci testing and certification service recommends planning safety and EMC together to avoid customs or review delays.

Q1　Is UL mandatory for power supplies in the US?

UL is not a single federal legal threshold, but Amazon and channel partners widely require a UL report or recognition, making it a de facto North America market gate.

Q2　What is the difference between UL 62368-1 and older standards?

UL 62368-1 is the hazard-based successor that replaced UL 60950 and UL 60065. New designs should follow 62368-1 directly.

Q3　Does a switching power supply also need FCC?

As a component of electronic equipment, it generally also needs FCC EMC compliance for the US market, depending on the end use.

Q4　Does UL require factory inspection?

Yes. UL programs typically include follow-up inspection (factory check) to maintain certificate validity, which is characteristic of the UL model.

本文内容仅供行业交流与信息参考，不构成任何形式的认证约定、检测建议或法律意见。文中涉及的认证要求、流程及标准信息可能随法规更新而变化，请以国家相关部门现行公告为准。检测认证的具体要求、周期及费用需根据实际产品由专业工程师评估确定，如有需求请致电咨询。

联系电话：18826804895　邮箱：net01@gtggroup.com

了解更多：https://www.anci.com