Breadcrumb Home UL UL STAMFORD and AvK products are certified by Underwriter’s Laboratories as UL Listed product across the range from smallest to largest product, up to 13,800 VAC. Low voltage product utilises an in-house insulation system approved to UL-1446. The products below 1000VAC are approved against UL 1004-1 and UL 1004-4. High Voltage Products can utilize an in-house insulation system approved to UL-1446. The products from 1000VAC up to 13,800VAC are approved against UL1004-9 and the applicable parts of UL1004-1 and UL1004-4. Further details of the UL approvals can be found that the following links with no registration required: Low Voltage Insulation System UL Listed Products For more information, you can register for a free UL account. “UL Listed” means that the STAMFORD and AvK products have been certified as fully compliant to the UL standards, and can be incorporated to your UL genset with the minimum level of testing necessary to certify that genset to the relevant UL standard. Contact the applications team