On Wed, Jun 18, 2008 at 11:41 PM, William Bross wrote: > My big concern is that I have never had any > requirements to hipot test any low voltage equipment - EVER. This is certainly not true. I have run hi-pot tests for all kinds of low voltage device. This depends on the specification of the device. For example, for PLC I/Os, we need to have isolation between the backplane and field side, so we need to do HiPot tests between them even their power supply is normally 24V (10-30V). And if you have uninsulated connectors exposed, you may have to do hi-pot tests as well. > I've done > many mains power driven devices and they usually get a hipot test. > Common sense engineering would lead me to believe that hipot testing low > voltage DC instruments with these levels for 2 seconds would surely > damage parts of the instrument, like the 36V TVS diodes across the power > inputs. Do you have different circuits in your device which need isolation? What is lab say about the HiPot test? You know you can have hi-pot tests between different section of the circuits. You may not need to do Hi-pot tests between the DC voltage (say 24V and return). Xiaofan -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist