We use TÜV to certify our products for essentially the same reasons as mcgyvr. We pursue listings year round and have an engineer dedicated to maintaining our file and another one or two who help out when necessary. UL would assign us another engineer every few projects and we would subsequently...
I believe these circuits are generally grounded for electromagnetic compatibility (either immunity or emissions), to prevent shock or fire hazards, or to protect other equipment that might be connected to them. I don't have the standards in front of me but we weren't required to ground our 24V...
Sales.
Liability.
When you have third party certification that you meet the relevant standards, more buyers will likely be interested in your product and, should anything go wrong, a better legal footing to defend yourself in court. If there is minimal risk of litigation, you can also prepare...
