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Low Earth Orbit
Lighting & Electrical
Why An Open Neutral Kills 120V Devices
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<blockquote data-quote="Kevin Graf" data-source="post: 59104" data-attributes="member: 1897"><p>Re: Why An Open Neutral Kills 120V Devices</p><p></p><p></p><p></p><p>In real life a single 8 foot ground rod could have an impedance of 100 Ohms or more!</p><p>In the NEC rule, if a single ground rod has a measured impedance of under 25 Ohms then it's permitted otherwise a second ground rod must be driven. But it requires a special meter that cost's about $2500 and takes a skilled technician about 1/2 hour to complete the test. So almost all residential and small business electricians skip the test and just drive a second ground rod.</p></blockquote><p></p>
[QUOTE="Kevin Graf, post: 59104, member: 1897"] Re: Why An Open Neutral Kills 120V Devices In real life a single 8 foot ground rod could have an impedance of 100 Ohms or more! In the NEC rule, if a single ground rod has a measured impedance of under 25 Ohms then it's permitted otherwise a second ground rod must be driven. But it requires a special meter that cost's about $2500 and takes a skilled technician about 1/2 hour to complete the test. So almost all residential and small business electricians skip the test and just drive a second ground rod. [/QUOTE]
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Why An Open Neutral Kills 120V Devices
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