UR is an American part certification. Finished product certification is the symbol of UL.

1, UL certification CRUUS mark or RUCRU mark.

2.RUUS marking: used to mark parts approved by Canada and the United States. This is a new UL approved part mark, which came into effect on April 1998. According to the requirements of Canada and the United States, it can be used for UL certified parts.

3. Originally, UL did not intend to introduce the mark of combination approval, but because UL certificate users whose products are sold to Canada and the United States like the Canadian/American list and grading mark very much, this new mark was introduced.

4.RUCRU mark: approved component mark and Canadian approved component mark.

Extended data:

Authentication function:

DOT certification in the United States and EEC certification in the European Union are completely different certification systems. The United States is actually a developing market, and Europe belongs to type approval. In contrast, DOT authentication mainly has the following characteristics:

1. The United States publishes all its standards, regulations and bills free of charge;

2. It is a self-certification procedure, and the manufacturer determines whether the product meets the standards according to the laws and regulations published by it;

3. Enterprises are responsible for their own data in the authentication process, and DOT does not supervise the whole detection process;

4. The Ministry of Communications will not issue any certificates to the applicants;

5. lenient entry and strict exit: annual compliance test is a powerful means to check the effectiveness of manufacturer's self-certification;

6. Market supervision is very strict. Relevant American institutions conduct spot checks in the market every year. Once found unqualified, the punishment is quite severe.

7. The contact between the Ministry of Communications and the manufacturer is realized through the manufacturer's agent in the United States. For more information, please consult Hangzhou Weiwo Engineer.

Baidu encyclopedia-American dot certification