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<blockquote data-quote="thylantyr" data-source="post: 2223989" data-attributes="member: 560358">Lifting the ground will allow you to debug ground loops. If you lifted the ground using the plug and it fixed the problem, then you now for sure it&#039;s aground loop. Identify the problem first, then try to fix it.When a manufacturers builds a product with a metal chassis and it has high voltage wiring inside, they have to connect the ground wire to the chassiswhich in turn connects to your AC outlet ground. If by any chance in your life,that device you bought had a failure, maybe a hot wire came loose and touched the metal chassis, an ungrounded chassis would cause high voltage on the metal and you can get shocked. If the chassis is grounded, you get an electrical short that trips the breaker or blows a fuse so you don&#039;t get shocked if you touch it.Power tools originally came in metal chassis with 3 prong cords.&nbsp; Now, they&nbsp; are &#039;double insulated&#039; and don&#039;t use the grounding method.There are other appliances in your home that may have plastic chassis andthere is no chance of electrical shock, hence no ground. I&#039;ve seen toasters withmetal chassis, and no ground plug.Most homes in the US built 40+ years ago may only have a few outlets with3 prongs.There is no real danger bypassing the ground, just don&#039;t make a habit of it. Certain items I won&#039;tbypass ground like any machine what works with water that is plugged in to AC, otherwiseaudio gear is no big deal really. I&#039;ve been shocked by 120VAC, no big deal. The bigger demon is 220VAC- 440VAC.There are some tricks to ground isolate equipment which providing ground protection. Lets say youwanted to make a DIY preamp or amp, you can installed a simple bridge rectifier to the chassis toprovide ground loop insolation but in the even that voltage &amp;gt; 1.4v hits your chassis, current conducts toprovide protection. You can also modd existing gear using this trick.</blockquote>

[QUOTE="thylantyr, post: 2223989, member: 560358"] Lifting the ground will allow you to debug ground loops. If you lifted the ground using the plug and it fixed the problem, then you now for sure it's a ground loop. Identify the problem first, then try to fix it. When a manufacturers builds a product with a metal chassis and it has high voltage wiring inside, they have to connect the ground wire to the chassis which in turn connects to your AC outlet ground. If by any chance in your life, that device you bought had a failure, maybe a hot wire came loose and touched the metal chassis, an ungrounded chassis would cause high voltage on the metal and you can get shocked. If the chassis is grounded, you get an electrical short that trips the breaker or blows a fuse so you don't get shocked if you touch it. Power tools originally came in metal chassis with 3 prong cords. Now, they are 'double insulated' and don't use the grounding method. There are other appliances in your home that may have plastic chassis and there is no chance of electrical shock, hence no ground. I've seen toasters with metal chassis, and no ground plug. Most homes in the US built 40+ years ago may only have a few outlets with 3 prongs. There is no real danger bypassing the ground, just don't make a habit of it. Certain items I won't bypass ground like any machine what works with water that is plugged in to AC, otherwise audio gear is no big deal really. I've been shocked by 120VAC, no big deal. The bigger demon is 220VAC- 440VAC. There are some tricks to ground isolate equipment which providing ground protection. Lets say you wanted to make a DIY preamp or amp, you can installed a simple bridge rectifier to the chassis to provide ground loop insolation but in the even that voltage > 1.4v hits your chassis, current conducts to provide protection. You can also modd existing gear using this trick. [/QUOTE]

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