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Why An Open Neutral Kills 120V Devices
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<blockquote data-quote="Langston Holland" data-source="post: 58255" data-attributes="member: 171"><p>School is in</p><p></p><p>Hello boys and girls!</p><p></p><p>I'm having a little bit of difficulty achieving that gleam of understanding in the eyes of my employees in reference to how a grand worth of damage occurred in 2 seconds at a genny powered gig recently. The crew leader (not an employee and never to work for me again) metered the genny as one of my employees watched. The genny then magically decided to send way too much voltage to about half of the small sound and lighting rig the moment he threw the switch to energize the system.</p><p></p><p>He called me in full CYA mode blaming the genny - I was a couple of states away at another gig. This was a very painful event and I'm determined never to allow it to happen again. Contrary to the A1's faulting the genny, no voodoo occurred and I'm convinced the genny was fine.</p><p></p><p>Of course I'm not going to tell you exactly what happened quite yet, I'm going to use you guys as guinea pigs (additional students) to help me figure out how to bring permanent understanding to my employees.</p><p></p><p>In a soon coming post, I'm going to ask some questions that will require you to do a little math just like what you saw in the PDF file linked to in my first post in this thread. The prize for the first one that answers all the questions correctly will be an Extech CT70 circuit analyzer. It's quite good, but not as good as the Suretest 61-164, thus I'm giving this one away with maybe 10 minutes of use. I'll ship anywhere in the US:</p><p></p><p><a href="http://www.extech.com/instruments/resources/datasheets/CT70data.pdf" target="_blank">Extech CT70 Circuit Analyzer Brochure</a></p><p></p><p><strong>To Begin</strong>:</p><p></p><p>I just put together a little high school level (if that) science project to bring it home to my crew. I demonstrated this thing to them today and they got quite a bit further toward the goal of mastery on this open neutral topic, but they're not quite there yet.</p><p></p><p>Here's what it looks like:</p><p></p><p><img src="http://soundscapesweb.com/files/PSW/OpenNeutral/OpenNeutralDemoBoard.jpg" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" /></p><p></p><p>Here's how it works:</p><p></p><p><img src="http://soundscapesweb.com/files/PSW/OpenNeutral/OpenNeutralDemoSchematic.png" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" /></p><p></p><p>To be continued...</p></blockquote><p></p>
[QUOTE="Langston Holland, post: 58255, member: 171"] School is in Hello boys and girls! I'm having a little bit of difficulty achieving that gleam of understanding in the eyes of my employees in reference to how a grand worth of damage occurred in 2 seconds at a genny powered gig recently. The crew leader (not an employee and never to work for me again) metered the genny as one of my employees watched. The genny then magically decided to send way too much voltage to about half of the small sound and lighting rig the moment he threw the switch to energize the system. He called me in full CYA mode blaming the genny - I was a couple of states away at another gig. This was a very painful event and I'm determined never to allow it to happen again. Contrary to the A1's faulting the genny, no voodoo occurred and I'm convinced the genny was fine. Of course I'm not going to tell you exactly what happened quite yet, I'm going to use you guys as guinea pigs (additional students) to help me figure out how to bring permanent understanding to my employees. In a soon coming post, I'm going to ask some questions that will require you to do a little math just like what you saw in the PDF file linked to in my first post in this thread. The prize for the first one that answers all the questions correctly will be an Extech CT70 circuit analyzer. It's quite good, but not as good as the Suretest 61-164, thus I'm giving this one away with maybe 10 minutes of use. I'll ship anywhere in the US: [url=http://www.extech.com/instruments/resources/datasheets/CT70data.pdf]Extech CT70 Circuit Analyzer Brochure[/url] [b]To Begin[/b]: I just put together a little high school level (if that) science project to bring it home to my crew. I demonstrated this thing to them today and they got quite a bit further toward the goal of mastery on this open neutral topic, but they're not quite there yet. Here's what it looks like: [img]http://soundscapesweb.com/files/PSW/OpenNeutral/OpenNeutralDemoBoard.jpg[/img] Here's how it works: [img]http://soundscapesweb.com/files/PSW/OpenNeutral/OpenNeutralDemoSchematic.png[/img] To be continued... [/QUOTE]
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