What characteristic defines an 'Independent Laboratory' in the context of electrical equipment testing?

An 'Independent Laboratory' is characterized by its engagement in performing periodic inspections and tests that are unbiased and not influenced by manufacturers or vendors. This independence is crucial for ensuring that the testing process is objective, providing credible results that can be trusted by consumers and industry professionals alike. Such laboratories are typically accredited and comply with national and international standards, which underpins the reliability and quality of their testing services.

In contrast, being owned by the manufacturer, providing testing at no cost, or being controlled by a vendor of similar equipment would compromise the laboratory's independence. If a laboratory is owned or controlled by a manufacturer or vendor, there is a risk that the results could be biased or skewed in favor of a product to meet commercial interests. Therefore, the independence of the laboratory is essential for maintaining the integrity of electrical equipment testing and certification.