Another reply listed UL www.ul.com approval. Here is a brief synopsis of the hundreds of pages of gobbledygook that you'll need to understand: UL Spacing (A.K.A.Creepage) for any 120VAC circuit minimum 1.58mm(0.062") UL open-shorted component test - major 120V components must not cause catastrophic failure if opened or shorted UL temperature ratings of plastic for any elevated temperature area Spacing from any arcing part to any plastic part depends on plastic temperature rating, usually 12.7mm(1/2") for low temperature plastics You will have to send the following to UL or an approved UL certified lab such as ETL: Samples of the unit (usually 3) Schematic diagrams of PC boards PC board trace diagram Wiring diagram showing connections between modules, motors, etc. Don't write any more information on the schematic than you need to. We typically delete component values, manufacturers, and almost everything except the symbols and a revision date. UL can make you stick to anything you send them, and changing resistor suppliers can then turn into a huge paperwork mess. If you have a microprocessor you are supposed to get FCC type approval as well. -- Lawrence Lile ----- Original Message ----- From: To: Sent: Tuesday, October 31, 2000 2:50 AM Subject: [EE]: Safety regulations for the american market Hi I'm currently involved in the design of a product that will probably be sold in the USA. What regulations apply if the product has a built-in switch mode power supply? Where can i find/buy information on these issues? The product is probably in the "consumer electronics" category. If you have much info that is too off-topic, please contact me privately. Regards Niklas Carlin -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details. -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.