Peter, I suspect nobody knows for sure. I should do, but... It is many years since I used my electrical training and I have forgotten much. I would think that there is a voltage surge upon switch off where the load is removed. I cant see why this would trip anything, but it obviously does. A capacitor across the input may cut down on spikes. Other than that, one of the computer spike eliminating sockets would do it and be better. They are now so cheap that I doubt one could make anything for the same price. (Of course, a 110 volt transformer would be even easier.) As for the off-topic, I have mentioned this before, but obviously to no avail. Alan ----- Original Message ----- From: "The Sheppard Residence" <peter@xxxxxxxxxxxxxxxxxxx> To: <modeleng@xxxxxxxxxxxxx> Sent: Tuesday, December 28, 2004 6:35 PM Subject: [modeleng] Re: Electrical Problem ..and a great shame that again the original question was ignored. I think I'll give up asking questions that's twice that there has been no serious answer to a real question. In fact, I may give up the list. Cheers Peter Jeff Dayman wrote: > We are getting very chatty and OT here folks. Hope our list server doesn't > cut the whole list off. > MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line. -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.298 / Virus Database: 265.6.4 - Release Date: 22/12/2004 MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.