The SmartPlug 30 Amp Inlet and Connector have passed all required testing for product safety certification by Intertek Testing Services and are now listed as ETL-certified products.  Intertek is the leading international provider of independent inspection, testing, and certification services.  The ETL Listed Mark is proof of a product’s compliance to meet US and Canadian safety standards. A common misconception among manufacturers in the United States is that their choice for compliance testing is limited to the UL Listed Mark.