Exactly the issue that UL brought up to me. Actually, for US where its polorized, it is permitted but its an issue for european where there is no real polarization (thus the requirement to switch both lines with a breaker, rather than just the hot). So, given the fact that it will be wired up correctly, will a MOV just across the line and return provide at least some protection? >From: Spehro Pefhany >Reply-To: pic microcontroller discussion list >To: PICLIST@MITVMA.MIT.EDU >Subject: Re: [EE]:proper use of MOV's >Date: Wed, 21 Jan 2004 10:05:29 -0500 > >At 06:36 AM 1/21/2004 -0800, you wrote: >>In most cases, I've seen MOV's just line to line >> >>But in doing some research, I've also seen in mentioned that for full >>protection, you want to place a MOV from hot to neutral/return (line to >>line), hot to chassis gnd and return/neutral to chassis gnd >> >>Any comments? > >I don't think this would be permitted by UL or CSA. It's unsafe. > >Best regards, > >Spehro Pefhany --"it's the network..." "The Journey is the >reward" >speff@interlog.com Info for manufacturers: >http://www.trexon.com >Embedded software/hardware/analog Info for designers: >http://www.speff.com > >-- >http://www.piclist.com hint: To leave the PICList >mailto:piclist-unsubscribe-request@mitvma.mit.edu _________________________________________________________________ Rethink your business approach for the new year with the helpful tips here. http://special.msn.com/bcentral/prep04.armx -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu