UL variation notice and corrective action requirements: UL/C-UL/ULC Mark Follow-Up Services
UL defines minimum requirements for actions by manufacturers in response to UL variation notices for nonconformances to UL requirements.
When a product does not comply with the follow-up service procedure, applicable standard or other UL requirements, UL representatives document the nonconformance on a variation notice (VN). A variation notice is a channel of communication between UL and a manufacturer and creates a record when nonconformances are discovered.
View the Variation Notice Corrective Action requirements document.
Visit UL University to search for available corrective action training.
