http://www.ul.com/About Certification
Underwriters Laboratories Inc. (UL) is an independent, not-for-profit
product-safety testing and certification organization. We have tested products
for public safety for more than a century.
The UL Mark on a product means that UL has tested and evaluated representative
samples of that product and determined that they meet UL's requirements. Under
a variety of our programs, products are periodically checked by UL at the manufacturing
facility to make sure they continue to meet UL requirements.
About CE
CE Marking is the symbol 
as shown on the top of this page. The letters "CE"
are the abbreviation of French phrase "Conformite Europeene"
which literaturely means "European Conformity". The term initially
used was "EC Mark" and it was officially replaced by "CE Marking"
in the Directive 93/68/EEC in 1993. "CE Marking" is now used in all
EU official documents. "CE Mark" is also in use, but it is NOT the
official term.
CE Marking on a product is a manufacturer's declaration that the
product complies with the essential requirements of the relevant
European health, safety and environmental protection legislations, in practice
by many of the so-called Product Directives.*
*Product Directives contains the "essential requirements" and/or "performance
levels" and "Harmonized Standards" to which the products must
conform. Harmonized Standards are the technical specifications (European Standards
or Harmonization Documents) which are established by several European standards
agencies (CEN, CENELEC, etc).
CEN stands for European Committee for Standardization.
CENELEC stands for European Committee for Electrotechnical
Standardization.
1. CE Marking on a product indicates to governmental officials that the product
may be legally placed on the market in their country.
2. CE Marking on a product ensures the free movement of the product
within the EFTA & European Union (EU) single market (total 28 countries),
and
3. CE Marking on a product permits the withdrawal of the non-conforming
products by customs and enforcement/vigilance authorities.