Everything we sell has been tested for electrical safety. We are working towards becoming a UL shop which would allow us to test and apply UL stickers to our fixtures. Until then we rewire everything to what we understand the UL standards to be and use a Hi-Pot tester to check for crosses and voltage leaks in the wiring. If you or your contractor are concerned about safety feel free to contact us for more info about our in-house testing. Some projects require that the lighting be UL listed. You may want to talk to your electrician or contractor about this. If you do need UL listing, for a fee we are able to send lights to the third party that can test and sticker the lights for UL. Please contact us with any questions.