Factory InspectionsUL Done - N of AFinal SubmittalTesting OptionsOpen ProjectPrep Report - Collect InfoSEL DepositPrelimanary ReviewPreliminary Review

With our thorough knowledge of the various specs and an initial product review, we can recommend design modifications early, to avoid surprises, costly rework down the road, and factory shipment stoppages. There is never a time that is too early in the design process to involve us.

Call Safety Engineering Laboratory at (408) 544-1890, fax us at (408) 544-1899, or email us at info@SELdirect.com with your company information and brief product description, so that we can schedule a preliminary meeting to introduce ourselves to you, become familiar with your products, and assist you in what is often perceived as an overwhelming venture. Or fill out our online form by clicking here to provide the detail.


After meeting with you and becoming familiar with your units, Safety Engineering Laboratory will provide a Budget Proposal that includes our projected costs and estimated agency fees. We require a deposit of 50% of our estimated consulting fee in advance for new accounts with no prior credit history with us. An open Purchase Order for the remaining 50% would be billed at an appropriate time in the process.

A Sample Budget -- More Info on Costs

Prep Draft UL Report; Collect Component Information

With the Purchase Order and deposit taken care of, typically, in just one day, Safety Engineering Laboratory prepares a draft report for your units at your factory, or our lab, summarizing problem areas and potential solutions. As we are collecting information for UL, we are also mindful of the additional information required by CSA, TÜV and CE marking. Our submitted reports incorporate as much flexibility as possible, allowing for alternate vendors and future design variations to avoid repetitious and costly retesting. By essentially handling the UL, CSA and TÜV simultaneously and exploiting any similarities in your various units, we employ a time-reduced, cost-efficient certification method.

Although we have refined the certification process, you are really the key to the success of our program. Our program works most effectively when you supply us with support, such as providing component approval status and possible second sources. In general, all components in the primary circuitry must have approvals, with the power supply (or mains transformer) being the most important. During this stage, most of the constructional and design issues are fleshed out and summarized.

Open Project with ULUp

To open a project with UL, Safety Engineering Laboratory will provide UL with a letter - summarizing the product details - and the following:

An Agent Authorization Form must be signed by a corporate officer in order for SEL to begin dialogue with UL on your company's behalf. SEL will provide you with the Form, after receiving notification that you would like us to proceed with the submittal.

A 100% Deposit for first-time clients is required in advance before opening projects with Underwriters Laboratories (UL) and Canadian Standards Association (CSA). The deposit checks should be made out to the appropriate agency for the amount shown in our budget, and given to Safety Engineering Laboratory for forwarding to the agencies with the letter to open the project. Please note that we cannot set the fees that the agencies charge, but base our estimates on our recent project with the agencies. TUV Rheinland requires a 50% deposit and a copy of the Purchase Order for the remainder. Please provide these deposits to SEL for forwarding to the agencies at the proper time, with other application materials.

After receiving our initial letter requesting the opening of the project and the signed Agent Authorization Form, UL will generate Application Forms (blue pages) and Follow-Up Service (FUS) Agreements (grey pages), which will need to be signed by a corporate officer and given to SEL for forwarding to the agency at the appropriate time.

A Sample Budget -- More Info on Costs

Testing Options

Typically, our policy is to perform the necessary tests at our laboratory. Pretesting in our lab reduces agency engineer on-site time, allows review of multiple clients' units in the same day, and reduces costs considerably. Our ability to accurately pretest makes certification a near certainty -- 'a process, not an experiment', as we like to say. We welcome you to come to our facility and be involved in any phase of the testing, which helps to clarify the design requirements and testing procedures with "hands-on" experience.

The second option is testing at your facility, which is the only possibility for large, complex, or scarce units. It is also a great learning experience for your people, who can gain a better, first-hand understanding of the certification process. History has shown that our role can decrease as the in-house engineer gradually assumes more responsibilities, if he so desires. The main downside to this method are increased costs from the added time to set up the test equipment at your facility and the logistics of coordinating people's schedules, testing space, and sample availability.

The third option -- one we rarely ever use -- is to send the sample directly to the agency, like most companies doing this for the first time on their own. The only reason for us to select this option would be to have the agencies perform a test that we cannot do in our own lab, which is rare. It is a major disadvantage to lose control of the sample, schedule and process in this way, and we recommend it be avoided, if possible.

Final Submittal Package to UL

After successful completion of the testing, collecting the necessary component information (including second sources), printing the photographs, etc., the package is then submitted to UL for a final review. It is at this time where model numbers, ratings, critical components and the like should be finalized.

UL Engineering Review Completed;
Final Report (the UL Procedure) Issued

Once the final package is reviewed and the UL engineers are satisfied that all the information is collected and the testing is completed, they can issue a letter notifying the client that the engineering review is complete. Usually within a couple weeks of the letter's issuance, the final Report, or the UL Procedure is issued to the client. However, for first-time UL clients, a scheduled audit of the factory's production procedures - called an Initial Production Inspection (IPI) -- must take place before units can be shipped with the Listing Mark. We can help train your factory personnel to meet the requirements of these Inspections, which after the IPI, will take place as often as four times per year, unannounced.

On-Going Factory Inspections

We provide support after your product is certified by training your factory personnel to meet the demands of Follow-Up Inspections. Typically, on the production line, AC-powered products are required to be 100% hipot and ground-continuity tested, so plans should be made to procure the testing equipment, if necessary. The agencies confirm, as often as four times per year for each agency, that the units continue to be built at the factory in accordance with the approved construction evaluated. If the UL Field Representatives find a dramatic deviation of the manufactured products from the compliant construction, UL can withdraw the authorization to apply its Mark, take back the Report that normally resides at the Factory, and require re-submittal for the altered construction. Although most attention is typically focused on obtaining the initial Listing, the longer term relationship with UL is through the on-going Follow-Up Inspections.

Safety Engineering Laboratory: 2370-D Qume Drive, San Jose, CA 95131
Phone: (408) 544-1890
Fax: (408) 544-1899 Web: www.SELdirect.com Email: info@SELdirect.com