This is common practise. Pretty much every desktop computer is wired this = way. dwayne At 09:29 AM 7/11/2014, Justin Richards wrote: >Basically my question is, Is it standard practice to tie the SMPS DC groun= d >to the mains earth? > >I am re-using a metal case and its built in SMPS from a faulty digital TV >decoder to house the PI(D) oven controller. > >The chassis was connected to a 2 pin AC plug and as such was not earthed >and the 0V/GND of the SMPS was tied to the chassis. (I thought such a >device either has to be earthed or double insulated.) > >I have installed an IEC socket and IEC plug and about to connect all the >earths to the metal chassis but noticed the DC ground is currently also >tied to the chassis. I assume this is standard practice but cant >definitely recall if I have seen a device wired this way. > >Justin >-- >http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive >View/change your membership options at >http://mailman.mit.edu/mailman/listinfo/piclist --=20 Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax www.trinity-electronics.com Custom Electronics Design and Manufacturing --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .