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Low Earth Orbit
Lighting & Electrical
Why An Open Neutral Kills 120V Devices
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<blockquote data-quote="TJ Cornish" data-source="post: 57458" data-attributes="member: 162"><p>Re: Why An Open Neutral Kills 120V Devices</p><p></p><p></p><p>You do have a neutral path - through the device on the other leg. When the neutral wire is correctly attached to the service, it holds the voltage at 120 volts from either hot to ground. If the neutral wire is disconnected, the entire 240 or 208 volts are divided between the relative loads on the two phases. A large load like an amp or lightbulb on one side and a small load like a mixer or rack device on the other side will cause the voltage across the large load to drop well below 120 volts, and the voltage across the lightly loaded side to rise potentially well above 120 volts. In an extreme case of a near short circuit on one side will cause the load on the other side to see basically the entire 240 or 208 volts from hot to "neutral", causing equipment death.</p></blockquote><p></p>
[QUOTE="TJ Cornish, post: 57458, member: 162"] Re: Why An Open Neutral Kills 120V Devices You do have a neutral path - through the device on the other leg. When the neutral wire is correctly attached to the service, it holds the voltage at 120 volts from either hot to ground. If the neutral wire is disconnected, the entire 240 or 208 volts are divided between the relative loads on the two phases. A large load like an amp or lightbulb on one side and a small load like a mixer or rack device on the other side will cause the voltage across the large load to drop well below 120 volts, and the voltage across the lightly loaded side to rise potentially well above 120 volts. In an extreme case of a near short circuit on one side will cause the load on the other side to see basically the entire 240 or 208 volts from hot to "neutral", causing equipment death. [/QUOTE]
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Why An Open Neutral Kills 120V Devices
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