This material is a reference aid that helps locate regulations. It is not legal or engineering advice and does not replace the official document. Only the official source in its language of adoption is authoritative; in case of any discrepancy, that source prevails. This is an unofficial translation from Persian: Iranian regulations have no official English edition. We strive for accuracy and currency but do not guarantee them, and errors or outdated provisions are possible. Verify against the official source before acting, and consult a specialist where needed. To the extent permitted by law, ptwhub is not liable for any loss arising from the use of this material. Last reviewed: 17.07.2026.