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Switching_PSU_CB_Multi_Market
Edit: ANCI 2026-07-20 107
Switching power supplies — from enclosed adapters to open-frame industrial modules — serve a global market where UL (North America), CE/ENEC (Europe), CCC/CQC (China), and KC (Korea) each impose independent certification requirements. The IECEE CB Scheme provides the most efficient multi-market pathway: one set of tests at a CBTL produces a CB Test Report, which can be converted into UL Recognition, ENEC certification, and CQC voluntary marking. However, the practical success of a CB-based strategy depends on three pre-certification design decisions: component selection for multi-market approval coverage, the inclusion of all target-market National Deviations in the CB test scope, and the output SELV/non-SELV classification that will be declared in each market's certificate. This article details the CB Scheme strategy for switching power supplies targeting UL, CE, and CCC markets simultaneously.
CB Report Structure for Multi-Market Coverage
A CB report targeting North America, Europe, and China must include the following National Deviation (ND) sections:
- US ND (UL/CSA differences): 120V/60Hz nominal mains, OVC II (2.5 kV), UL 94 V-0 PCB substrate required. UL-specific requirements: transformer insulation system must have OBJY2/OBJY8 UL file number, fuse must have UL 248-14 listing, optocoupler must have UL 1577 recognition. The CB report must explicitly reference these UL file numbers for each critical component.
- EU ND (EN differences): 230V/50Hz nominal mains, EN 62368-1 Annex Zx deviations. EN-specific: the output accessibility assessment — open terminals must be classified as either "tool-accessible only" or "user-accessible" based on the end-equipment's enclosure design. The power supply's installation manual must clearly state the accessibility classification.
- CN ND (GB differences): 220V/50Hz nominal mains, GB 4943.1 deviations from IEC 62368-1 — primarily in the mains voltage tolerance range and the overvoltage category applied to power distribution circuits within the equipment.
The CB Report + CB Test Certificate serve as the single-source technical document for all subsequent national certifications. A switching PSU CB multi-market ND coverage audit before testing submission verifies that all target-market deviations are captured in the test plan.
Critical Component Selection — The Pre-Certification Bottleneck
The single most common reason CB-to-national-certification conversions fail is critical components lacking the required approvals in the target market:
- Transformer: UL requires OBJY2/OBJY8 recognized insulation system; ENEC/VDE requires EN 61558 or IEC 62368-1 Annex G compliant insulation. The solution: specify triple-insulated wire (TIW) with dual UL+VDE certification (Furukawa TEX-E, Rubadue Wire, etc.) from the design stage.
- Optocoupler: Needs UL 1577 + EN 60747-5-5 (VDE 0884-10) dual certification. Medical/industrial-grade optocouplers (Broadcom, Toshiba, Vishay) typically carry both.
- X/Y capacitors and fuses: UL (UL 1414/UL 248-14) and ENEC (EN 60384-14/EN 60127) standards are highly harmonized — selecting components with dual UL+ENEC marks eliminates the need for component substitution between markets. This is the simplest and most cost-effective multi-market strategy.
A component-level compliance matrix — listing each safety-critical component with its UL, VDE/ENEC, and CQC file numbers — should be maintained as a living document and verified at every design review milestone.
CB to National Certification — The Conversion Process
- ①CB → UL: UL reviews CB report + US ND section. If all ND items are covered and component UL file numbers verified, UL issues UR certificate. Factory IPI inspection follows — UL inspector visits the manufacturing site to verify production line testing.
- ②CB → CE/ENEC: CB report serves as the LVD Technical File. For ENEC (premium mark), an ENEC-certification body (VDE, Nemko, IMQ) reviews the CB report and conducts factory inspection.
- ③CB → CQC/CCC: CQC reviews CB report + CN ND. For PSUs not in CCC mandatory catalog (open-frame modules), CQC voluntary certification is the recommended path — provides a recognized safety certificate for end-equipment CCC submission.
Frequently Asked Questions
Q1 How long does CB-to-UL conversion typically take?
UL document review of a well-prepared CB report (with all ND items covered and component UL file numbers verified) typically takes 2-3 weeks. If the CB report has missing ND items or unverified component UL numbers, UL may request supplementary testing or component documentation — extending the timeline. Pre-submission component verification is the key efficiency lever.
Q2 Can a single CB test report cover both 120V and 230V rated PSUs?
Universal-input PSUs (85-264VAC) are tested at both voltage extremes in a single CB test campaign. Temperature rise is measured at both 120V/60Hz and 230V/50Hz — the higher of the two measurements is reported. Dielectric withstand is tested at the worst-case voltage (typically 120V results in higher currents through the primary circuit, testing protection devices at higher thermal stress).
Q3 Does CB certification cover EMC or just safety?
CB Scheme covers safety only (IEC 62368-1 / IEC 61010-1). EMC compliance must be tested and certified separately per jurisdiction: FCC Part 15B (US), EN 55032/55035 (EU), GB/T 9254.1 (China). EMC test reports are bundled with the CB safety report into the complete certification package for each market.
Q4 What is the cost advantage of CB vs. testing separately in each market?
CB testing at one CBTL replaces three separate safety test campaigns (UL lab + EU lab + China lab). The testing cost itself is reduced because one set of samples, one test setup, and one report generation serve all markets. The incremental cost is the CBTL's ND documentation fee and the national certification body's review fee. For ≥3 markets, CB provides clear ROI compared to independent testing in each market.
Q5 Can a CB report be issued by any ISO 17025 lab?
No — CB Test Reports can only be issued by IECEE-accepted CBTLs (CB Testing Laboratories). The CBTL must be designated for the specific product category (e.g., OFF for IT/AV power supplies). An ISO 17025 accreditation alone does not authorize a lab to issue CB reports. Always verify the lab's current CBTL scope on the IECEE website before commissioning testing.
This content is for informational reference only. For inquiries, please contact us.
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