Posted on Nov 24, 2017
What is a UL listed Current transformer (CT)?
1, Marked with UL Listed Mark;
5, UL Listed CTs can be installed directly in the field and do not need to be packaged as part of a larger system that is co-calibrated in the factory.
What is a UL Recognized Current transformer (CT)?
1, Marked with UL Recognized Mark;
Why UL listed CT?
The new NESC code says: If you are going to field-install current transformers (CTs), they must be certified to the UL2018 (XOBA) standard. This is the UL ¡®Listed¡¯ Mark:
Changes in the new 2017 edition of the National Electrical Safety Code (NESC) calls for the enforcement of the UL2808 standard (Category XOBA). Now is the time get ahead of the coming inventory problems.
If a CT bares the UL ¡®Recognized¡¯ mark, then field installation requires a UL inspection and costly system recertification after installation to retain the UL Listed system¡¯s integrity. This the Recognized mark: