NBTC Certification Process in Thailand
All telecommunications and RF equipment sold or imported into Thailand must obtain NBTC approval before entering the market. The NBTC certification process follows one of three pathways — SDoC, Class A Registration, or Class B Certification — depending on the device type and frequency band. This guide explains how each pathway works and what to expect at every stage.
The Three Certification Pathways
The applicable pathway is determined by the device's frequency band, transmit power, and applicable NBTC technical standard — not by the product category. Some devices require more than one approval if they operate across multiple bands.
Supplier's Declaration of Conformity
The lowest-friction pathway. The manufacturer or their authorised representative self-declares conformity with the applicable NBTC technical standard. No NBTC trade license or supplier code is required at submission.
Registration
A formal registration with NBTC review. The application must be filed by a Thai juristic person holding an NBTC trade license and supplier code — either Zergo's in-house local representative or the client's own appointed local representative.
Certification
The most rigorous pathway, required for cellular devices and base station equipment. NBTC conducts a full technical review of the submitted test reports and documentation before issuing approval.
Timelines are estimates from date of submission. Additional time may be required if NBTC requests supplementary documents during review.
Not sure which pathway applies to your product? See the full guide to NBTC certification types or use the NBTC Certification Checker.
How the Certification Process Works
Zergo manages every stage of the NBTC certification process on the client's behalf — from document review through to delivery of the final approval. The steps below reflect how Zergo works with overseas manufacturers and certification agencies.
Document Preparation
The client provides technical specifications, product photos, and test reports from an accredited laboratory. Zergo reviews the documents for completeness and alignment with the applicable NBTC technical standard before submission. Clients requiring a structured review prior to this stage can request a Pre-Submission Review.
Local Representative Assignment
Class A and Class B applications require a Thai juristic person — holding an NBTC trade license and supplier code — to act as the local representative for filing. Zergo's in-house local representative fulfils this role by default. Clients who have their own appointed Thai entity may use that representative instead; Zergo continues to manage all preparation and NBTC communication regardless.
SDoC applications do not require an NBTC trade license or supplier code at submission.
Submission to NBTC
Zergo submits the complete application to NBTC on the client's behalf. Submission is made through the appropriate channel for the certification type and includes all required documentation in the format specified by NBTC procedures.
NBTC Review & Communication
NBTC reviews the submitted application. If NBTC raises queries or requests supplementary information, Zergo handles all communication directly — the client is notified and involved only where a substantive response requires their input. This applies at every stage of review, including any requests for additional testing documentation.
Approval & Delivery
Upon NBTC approval, Zergo provides the client with the official approval document and all reference numbers required for product labelling and import compliance.
- SDoCSDoC document with reference number
- Class ACertificate of Registration with Registration Number
- Class BApproval Certificate with Approval Number
Required Documents
The following documents are required for all NBTC certification applications. No physical sample submission is required — the process is documentation-based.
Technical Specification or Datasheet
Including wireless communication details: frequency band, transmit power, modulation, and antenna specifications.
Product Photos
Exterior views of the product, including any markings, labels, and interfaces.
Test Reports
RF, Safety, and EMF/SAR test reports (as applicable) from an ISO/IEC 17025-accredited laboratory. Foreign test reports from recognised accreditation bodies are accepted.
ISO/IEC 17025 Accreditation Certificate & Lab ScopeClass A & Class B only
Accreditation certificate of the testing laboratory and the relevant scope of accreditation covering the test standards applied.
Authorised Declaration
A declaration from the manufacturer or their authorised representative confirming accuracy of the submitted information.
After Certification: Labelling & Compliance
Approval is not the final step. Products must carry the correct markings before they can be sold or imported into Thailand.
SDoCConformity Statement
Products approved under SDoC must carry a conformity statement referencing the applicable NBTC technical standard. The statement can appear on the product, its packaging, or accompanying documentation.
Class AClass BNBTC Label
Products approved under Class A or Class B must display the official NBTC label, purchased directly from NBTC. The label format differs by certification type and includes the registration or approval number and the supplier code. To purchase labels, the approval document and an invoice indicating the quantity required must be submitted to NBTC.
Zergo's scope covers the certification process through to delivery of the approval document and reference numbers. Post-certification compliance — including label procurement and product marking — is the responsibility of the operator or importer.
Ready to Start Your NBTC Certification?
Zergo handles every stage of the NBTC certification process — document preparation, submission, NBTC communication, and approval delivery. See what's included in our NBTC Certification Service.