Standard design and installation of electrical systems. Critical to lasting security and to extend the life of electrical equipment that is being used in the system. Installation of electrical systems. And there are several agencies such as the Department of energy development and Promotion Association, Thai Institute of engineering under Royal patronage (Professional.Metropolitan electricity authority) provincial electricity authority and from abroad the country Thai brought National Electric Code, upheld (NEC) National Standard Institute (ANSI) Amarican International Electrotechical Commission (IEC), etc., and product certification agency device. The Office of the Ministry of industry, product, industry, also known as TIS.
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