boom-vitt/kicad-thai/thai-pcb-compliance

Thai compliance for electronics (มอก. / กสทช. / mains safety)

Reply in Thai when the user writes Thai. You are giving engineering guidance, not legal advice: state which facts are verified (with the source from the references) and which are not, and point to the regulator or a test lab for the final answer. Never invent a มอก. number, a fee, a deadline or an NBTC rule — if it's not in references/standards.md, say you don't know and how to find out.

1. Classify the product (ask or infer)

Then produce a short table: requirement → applies? → why → next step → who to contact. Mark each fact verified (source) or check with regulator.

2. Radio (กสทช.)

Key facts (sources in references/standards.md):

• WiFi/BLE 2.4 GHz at ≤ 100 mW e.i.r.p. (20 dBm including antenna gain):

licence-exempt, SDoC to กสทช. มท. 1035. From 1 Feb 2026 the SDoC is reported to need an electrical safety report too — confirm with NBTC.

• LoRa AS923 (920–925 MHz): ≤ 50 mW e.i.r.p. → SDoC; above → Class A testing.
• Using a pre-certified module (ESP32-WROOM, etc.) helps with testing, but

assume the finished product still needs its own SDoC under its brand/model.

• Design consequences to check in KiCad: antenna keep-out per the module

datasheet, RF power configured in firmware so e.i.r.p. stays within the limit with the antenna actually used (e.g. ESP-IDF esp_wifi_set_max_tx_power(), units of 0.25 dBm), and a label space for the NBTC marking.

3. Mains on the board (ไฟบ้าน 220 V)

Read references/mains-pcb.md for definitions, starting values and layout rules. In KiCad 9+:

1. Put every mains net in a net class named Mains; nets above 250 V (rectified

DC bus ~325 V, switcher primary) in Mains_HV (6.4 mm reinforced creepage).

1. Append the mains rules to the project's rules file: from the kicad-check

skill, tail -n +2 "<kicad-check>/assets/rules/mains-220v-addon.kicad_dru" >> <project>.kicad_dru, or copy the rule block from references/mains-pcb.md.

1. Run kicad-check; clearance and creepage violations on mains nets are blocking.

KiCad 8 has no creepage check: measure creepage by hand (measure tool along the board surface, around slots) and tell the user to upgrade if possible.

Push the user toward the simplest safe architecture: an external certified adapter keeps their own board SELV-only, which is cheaper to certify. If mains must be on the board, use certified building blocks at the barrier (AC-DC module with a CB report, relay with reinforced coil–contact insulation) and never a non-isolated supply when anything is touchable.

4. Materials and environment

• RoHS: Thailand's มอก. 2368-2564 is voluntary; EU exports need EU RoHS. Order

lead-free HASL or ENIG and lead-free assembly by default.

• WEEE/EPR: still a draft law in Thailand — mention it for product planning only.
• Climate: hot and humid; consider conformal coating, higher creepage

margins (pollution degree 3 in dirty/condensing locations), and 40 °C+ ambient derating inside enclosures.

5. Where to test

EEI (Samut Prakan) and PTEC/NSTDA (Pathum Thani) do safety and EMC testing in Thailand; details and links in references/standards.md. Suggest a pre-compliance scan before the formal test for anything with switching supplies or radios.

Output

End with: "Verified" facts (with links), "Check with regulator/lab" items, and the concrete KiCad changes (net classes, rules, keep-outs, slots, silkscreen warnings and label areas) — so the engineering work can start today.