Established in 1894, Underwriters Laboratories (UL) is an organization for testing products.

The UL checks the companies, its products and materials, the components and systems. If the specific requirements are met, the goods may be marked with the chargeable "UL" mark. Underwriters Laboratories has developed more than 1300 safety standards to test products in terms of safety. In addition to electrical safety, the articles are also tested for flammability and mechanical hazards. The UL Listing mark is a proof of representative samples of the corresponding product and compliance with applicable safety requirements.

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