UL Testing for Transformers and Power Supplies

contact UL. IIRC, you can use a certified source or you can become yourself certified.

hi,

you first contact UL office in your country or just log on to google and you will find the required contact details.

before doing all this, your product (transformer) must conform to UL standard or IEC standard. you will received UL standard after you conform order with UL only. but IEC standard you can check up at EUROPA site or ask TUV and they will guide you, so you can at least have pre conformity before proceeding to UL testing. UL is required only if you want to sell your product in USA, in EUROPE you need CE.

regards,

alpesh popat

popatalpesh@yahoo.co.in

All the UL Standards are available for purchase. As said the best approach is to contact UL and determine which Standard/s will be applied. Read the Standard and check yourself as far as possible there are no non conformances. If you have failures in UL it can be costly and waste time. As a general rule expect to pay twice as much and is will take twice as long for UL as against testing to the IEC Standard.

If your products are already approved to the IEC Standard there should not be too much engineering required.

UL do offer pre conformance testing looking at the basic clauses such as abnormals which can be very beneficial.

The suggestion to buy a UL Standard is great. Many manufacturers submit their products without first designing and testing in-house, then there can be (expensive) failures at the lab, requiring re-submittal, etc. You can get UL (and other) Standards at globalihs.com, techstreet.com, ili.co.uk.

UL is certainly not the only testing laboratory available, however if that's your choice, I recommend having a private agency review and test your product beforehand, such as certifygroup.com, or any other experienced testing groups if you don't have a product regulatory person on staff.