I agree with you 100% about your design approach with relays. I took the same approach. I see the same issues with out sourced and China designs. In addition, US management has said to their engineering staff, if they can do it then you do it. I fought this battle at numerous design reviews. Therefore, I am not surprised that this Smart Fortwo? burn to a crisp. As far as UL, UL is not what they used to be. Things changed when the US changed to NRTLs. In order to compete for business, the labs have gotten cozy with businesses.
________________________________ From: Lee Hart <leeah...@earthlink.net> Sent: Wednesday, July 12, 2017 2:28 PM To: ROBERT Subject: Re: [EVDL] ? Is this really a Smart Fortwo ED EV that burnt to acrisp ? ROBERT wrote: > Lee, you are correct. I agree; however, I would never use a relay on an EVSE. > But that just me. I have a motor control (with correct size heater) on my > outside fountain pump (1/6 HP). Hi ROBERT, All I can say is that both Nissan and Toyota used relays in their 120vac EVSEs, and both are UL listed. That means they satisfied UL that they are safe. I worked for Robertshaw and Honeywell for well over a decade, designing controls for large home appliances and furnaces. In all but the highest power ones, we used relays. But they weren't your run-of-the-mill cheap relays; they were ones with a long list of safety approvals and testing. And, we often had backup systems in place to detect a welded relay contact and stop operation some other way. For example, TWO relays in series, with logic that tested each one individually before closing both to energize the load. One thing that saddens me is that large amount of such "intrinsically safe" design has gone out the window as companies weaken the regulations and outsource everything to countries where safety testing is weak or nonexistent. Manufacturers now get controls from China that do things that would NEVER be tolerated in a US product. -- Where ignorance is our master, there is no possibility of real peace. -- Dalai Lama -- Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com<http://www.sunrise-ev.com> The Sunrise EV2 Project<http://www.sunrise-ev.com/> www.sunrise-ev.com The Sunrise EV2 Project Homepage. Welcome! We are a group of dedicated electric vehicle enthusiasts whose goal is to create an affordable, high performance electric ... -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20170712/1d22627c/attachment.htm> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)