## [Follow-Up Services: Ongoing Onsite Certification Inspections](/resources/follow-up-services) ![Depth of field. Great processing photos.Used professional equipment.](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:5623f049-18c6-4631-9fcb-99a31768423b/as/5623f049-18c6-4631-9fcb-99a31768423b.webp?&smartcrop=Square&max-quality=90&width=400) # Follow-Up Services: Ongoing Onsite Certification Inspections Understanding ongoing inspection requirements for your UL Certifications. [ Contact us ](#form) *play\_arrow* *pause* ## Breadcrumb - [ *keyboard\_arrow\_left* Resources ](/resources) - [ Home ](/) *pen\_size\_1* - [ Resources ](/resources) *pen\_size\_1* - Follow-Up Services: Ongoing Onsite Certification Inspections Close *cancel* ### Get connected with our team Thanks for your interest in our products and services. Let's collect some information so we can connect you with the right person. \* By ticking this box, I confirm that I have read and understood the [Online Policy](https://www.ul.com/resources/online-policies) and consent to the processing of my personal data as described therein. \* By ticking this box, I consent to the cross-border transfer of my personal data as described in the [Online Policy](https://www.ul.com/resources/online-policies). I agree to receive UL Solutions marketing communications and understand that I can opt out at any time without affecting other services by visiting our [Preference Center](https://www.ul.com/preference-center). ##### Thank you! One of our team members will respond to your request as soon as possible. Close ## Follow-Up Services program The process of obtaining a certification doesn’t stop when a product leaves our testing laboratories. Once you have completed your project and achieved UL Certification, our ongoing onsite certification inspection, known as the Follow-Up Services program, begins at the locations you identify as authorized to manufacture your product. The Follow-Up Services program is designed to confirm that a manufacturer's UL Certified product continues to comply with the original certification requirements. This work takes place through factory inspections and audits at locations where UL Certified products are manufactured and the UL Mark applied. ### Key elements of onsite certification inspections A key element of our ongoing certification requirement is the factory inspection to confirm the certified product being manufactured is the same (or meets the requirements) as that assessed in the original evaluation. If a product bears a UL Mark, a manufacturer must be able to provide verification that the product is constructed to meet the Follow-Up Service Procedure requirements. This is to be confirmed during the Initial Production Inspection. In addition, a key element in determining compliance with UL Solutions requirements is confirming that materials and components used in UL Certified products are consistent with their descriptions in UL Solutions Follow-Up Services procedures, such as use of UL Listed or Recognized components. This is determined by review of component markings and appropriate component traceability. When construction changes to UL Certified products are necessary you may submit your request to your local UL Solutions field engineer for assistance. Visit our [Customer Guide To Submitting Revisions To UL Solutions](/resources/help/customer-guide-to-submitting-revisions-to-ul) webpage to learn more. ![Shot of two engineers using a digital tablet together in an industrial place of work](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:82876b87-f471-4b68-a3c2-5f8d7f279ef3/as/82876b87-f471-4b68-a3c2-5f8d7f279ef3.webp?&smartcrop=Landscape&max-quality=90&width=400) ## Customer requirements documents There are key documents that are required or can be helpful during inspections. You can find links to them below. PDF ### UL Mark Surveillance Requirements - English Customer Facing Document [ Download PDF *download* ](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:0cf2de14-0fe7-4ce5-a436-fe606e357331/original/as/UL-Mark-Surveillance-ENG.pdf) PDF ### UL Mark Surveillance Flowchart Customer facing document [ Download PDF *download* ](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:b173878f-5faa-4904-ad73-c9af30b8f302/original/as/UL_Mark_Surveillance_Flowchart_May_2025.pdf) PDF ### Guide for legacy, smart and enhanced UL Certification Marks Customer Facing Document [ Download PDF *download* ](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:aa0484a1-6451-41f3-bc66-67dbba862ee5/original/as/Customer-Facing-Document_Infosheet_Printing-Mark_Final.pdf) PDF ### UL Traceability Requirements - ENG Customer facing document [ Download PDF *download* ](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:918289dc-d7ee-4e53-8175-169b426df4c1/original/as/UL_Traceability_Requirements_ENG.pdf) PDF ### Unlisted Component Program Customer Facing Document [ Download PDF *download* ](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:b6876da3-7750-4251-b023-dce18faa0b33/original/as/Unlisted_Component_Program_FINAL.pdf) PDF ### UL Requirements for Dielectric Voltage ENG Customer facing document [ Download PDF *download* ](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:f00e976d-698c-490e-8d9e-ccb09a6ef812/original/as/UL_Requirements_for_Dielectric_Voltage_ENG.pdf) PDF ### UL Calibration and Variation Requirements customer facing document [ Download PDF *download* ](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:7aeebb85-3fea-4112-a706-c82ae04bcdd9/original/as/UL_Calibration_and_Variation_Requirements_ENG.pdf) PDF ### Canadian Certification Requirements for Bilingual Safety, Warning and Caution Markings UL will verify requirements for bilingual safety, warning and caution markings that are required for products certified for Canada. This document applies to all customers of UL’s product certification services for the Canadian markets, i.e., C-UL or ULC Mark certifications. [ Download PDF *download* ](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:bd714651-f2f9-4197-9a16-051d8a7a7973/original/as/Canadian_Certification_Bilingual_Marking.pdf) PDF ### Nonconformance and Corrective Action Report ENG Customer facing document [ Download PDF *download* ](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:123b6d48-db06-4ff0-a448-f2a4bb1eb1c0/original/as/Nonconformance_and_CAR_ENG.pdf) PDF ### UL Mark Surveillance Program - Liquid, powders, gases and hazardous sample shipments for U.S. and Canada Safety Certification Mark Follow-Up Services Customer facing document [ Download PDF *download* ](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:885995fc-901b-4687-b947-f26c3d5f2776/original/as/UL_Mark_Surveillance_Follow-Up_Services_Program.pdf) ## Product specific resources XLSX ### Tank Calculations Double Wall Type I Using S603 Tank Calculations - Using S603 [ Download XLSX *download* ](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:39bcb8ed-ab72-49cd-9a74-c12105ad89d8/original/as/S603-Roark.xlsx) XLSX ### Tank Calculations Double Wall Type I Using UL 58 Tank Calculations - Using UL58 [ Download XLSX *download* ](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:41425358-bd02-4c78-9253-d08c29282922/original/as/UL58-Roark%20%281%29.xlsx) PDF ### UL Solutions requirements for counterchecking knockouts in sheet metal enclosures authorized in the Follow-Up Services Procedure UL Requirements for Knockouts in Sheet Metal Enclosures, Guidelines for counterchecking knockouts [ Download PDF *download* ](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:9fafdd00-a5cd-4e70-bab1-d768090fb10c/original/as/CORP24CS1410929-Counterchecking_Knockouts_FINAL.pdf) ### The value of onsite certification inspections We work with you every step of the way throughout the lifecycle of you product. Our field engineers are able to support your ongoing certification services needs, forging a mutually beneficial relationship. As your needs change, we change with you, providing customized assistance as you navigate new product launches, process adjustments and growth opportunities. Our ongoing involvement helps protect the investment that you’ve made in achieving UL Certification and benefits you by acting as your trusted safety, security and sustainability partner throughout your compliance journey. Our comprehensive ongoing certification services and market surveillance help to drive compliance in the supply chain, reduce risks and costs associated with unsafe products and protect your brand reputation and the integrity of the UL Mark that you have earned. ![Low angle view of technician walks with investor through field of solar panels, Alternative energy to conserve the world's energy, Photovoltaic module idea for clean energy production.](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:25d564d8-be68-4b71-b305-0765044cba20/as/25d564d8-be68-4b71-b305-0765044cba20.webp?&smartcrop=Landscape&max-quality=90&width=400) ### When will onsite certification inspections start? While certification testing in the laboratory provides an initial assessment of compliance, our industry-leading Follow-Up Services program continues to determine compliance long after a product has left our testing facilities. These ongoing certification services take place through inspections and audits at locations where UL Certified products are manufactured, assembled, fabricated, processed, finished, or where products are stored or labeled with UL Marks. Our ongoing certification services focus on examining both completed end products as well as the components that comprise those finished products. Component safety is a foundational element of the overall safety of a finished product and is critical in getting safer, compliant products to market. ![UL certification mark](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:3c028630-69bd-432f-97d7-f299d9f49c8c/as/3c028630-69bd-432f-97d7-f299d9f49c8c.webp?&smartcrop=Landscape&max-quality=90&width=400) ## Get your start with FUStart FUStart is a resource to help you prepare for factory inspections and audits by our field engineering team. You can review the FUStart overview on your own, or you can review it with the UL Solutions field engineer assigned to your account. This tool is an important training resource to help you seamlessly implement our follow-up requirements and to maintain ongoing compliance and certification after successfully completing your UL Solutions product certification testing. Reviewing the FUStart tool with your own manufacturing team will help you understand our policies and requirements for manufacturing UL Certified products and plan your production and documentation. **Download a copy of the FUStart tool** PDF #### FUStart ENG FUStart [ Download PDF *download* ](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:85ab0153-dbff-4beb-9d08-330337317e71/original/as/FUStart_Overview_-_Feb_2025_ENG.pdf) PDF ### FUStart FRE FUStart [ Download PDF *download* ](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:6662c919-3806-49f0-adf8-9c825420a2ff/original/as/Revised_FUStart_Overview_-_Feb_2025_FR-FR.pdf) PDF ### FUStart FRE CAD FUStart [ Download PDF *download* ](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:6249f6ec-f8a3-49a0-a56f-7a6e66010b00/original/as/FUStart_Overview_-_Feb_2025_FR-CA.pdf) PDF ### FUStart GER FUStart [ Download PDF *download* ](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:ed422cf9-a9ef-4702-aa10-b2c89606768b/original/as/FUStart_Overview_-_Feb_2025_GER.pdf) PDF ### FUStart - ITA FUStart [ Download PDF *download* ](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:a2c2530b-506d-4eb3-a1b7-0fd846225614/original/as/FUStart_Overview_-_Feb_2025_IT-IT.pdf) PDF ### FUStart JAP FUStart [ Download PDF *download* ](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:7eb5328f-7013-48a6-9bae-55e9a565c1b3/original/as/FUStart_Overview_-_Feb_2025_JA-JP.pdf) PDF ### FUStart KOR FUStart [ Download PDF *download* ](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:288becd8-dfe8-4305-a374-8404cfd9c0fb/original/as/FUStart_Overview_-_Feb_2025_KO-KR.pdf) PDF ### FUStart POR Fustart [ Download PDF *download* ](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:db52a5a7-c384-4e1c-86bd-66b103124b6e/original/as/FUStart_Overview_-_Feb_2025_PT-PT.pdf) PDF ### FUStart POR LATAM FUStart [ Download PDF *download* ](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:2663bca2-565f-44ba-a2a6-9e3cc4081302/original/as/Revised_FUStart_Overview_-_Nov_2024_PT-BR.pdf) PDF ### FUStart SIMP CHI FUStart [ Download PDF *download* ](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:d7c4987e-373a-4bc9-bb8e-49e47a22e0c2/original/as/FUStart_Overview_-_Feb_2025_Simplified_Chinese.pdf) PDF ### FUStart SPA FUStart [ Download PDF *download* ](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:a4776cc4-979d-403f-b6a3-237c857d55f0/original/as/FUStart_Overview_-_Feb_2025_ES-ES.pdf) PDF ### FUStart SPA LATAM Fustart [ Download PDF *download* ](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:e956058f-1ad1-46c7-ab6f-61a4da016bb2/original/as/FUStart_Overview_-_Feb_2025_ES-LA.pdf) PDF ### FUStart TRAD CHI FUStart [ Download PDF *download* ](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:619ec8ea-df66-4a07-bbae-4b24f2999269/original/as/FUStart_Overview_-_Feb_2025_Traditional_Chinese.pdf) ![Car Factory: Female Automotive Engineer Wearing Hard Hat, Standing, Using Laptop. Monitoring, Control, Equipment Production. Automated Robot Arm Assembly Line Manufacturing Electric Vehicles.](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:a5ab846e-0c77-4f3f-9c7a-6fffec5d483d/as/a5ab846e-0c77-4f3f-9c7a-6fffec5d483d.webp?&smartcrop=Portrait&max-quality=90&width=400) ![UL Solutions](/modules/custom/ul_component/components/brand_element/assets/brand-element-positive/mobius.svg) ![UL Solutions](/modules/custom/ul_component/components/brand_element/assets/brand-element-reverse/mobius.svg) ## Let's start a conversation To learn more, please contact us or speak directly to your local field engineer. [ Contact us ](#form) ## Additional resources ![UL certification mark](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:3c028630-69bd-432f-97d7-f299d9f49c8c/as/3c028630-69bd-432f-97d7-f299d9f49c8c.webp?&max-quality=90&width=400) ### Marks and Labels UL Solutions is a global leader in testing, inspection, certification, auditing and validation. UL Solutions is a global leader in testing, inspection, certification, auditing and validation. Our UL Mark is recognized as a symbol of trust, appearing on billions of products globally. [ Learn more ](https://markshub.ul.com/) ![Mature businesswoman leading team meeting in office conference room](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:7cd698d0-c7de-45c2-847b-b5cc25cc531e/as/7cd698d0-c7de-45c2-847b-b5cc25cc531e.webp?&max-quality=90&width=400) ### Customer Center As a customer of UL Solutions, we want to provide you with the knowledge needed to navigate your journey with us – providing you the expertise and insights necessary to solve your critical business challenges. [ Learn more ](/resources/customer-center) ![Person giving help and support ona a laptop.](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:28be5b3d-8df0-4732-b27a-29a3a93df514/as/28be5b3d-8df0-4732-b27a-29a3a93df514.webp?&max-quality=90&width=400) ### Help and Support Answers to your frequently asked questions, report revision submissions and contact information for customer support. 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