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Lighting & Electrical
AC line loss causes hum
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<blockquote data-quote="Othmane Alaoui" data-source="post: 83350" data-attributes="member: 1864"><p>Re: AC line loss causes hum</p><p></p><p>When you have an unbalanced 3 phase network, it does happen that you get zero sequence issues, this imply the presence of the third harmonic at a certain level, 180Hz. The hum is not only at 60Hz but go very often higher. Even when we connect our stuff directly to 120Vac, the line (120ac) is part of either 240V LL or 208, 3 phases. its very important to always make sure your loads ( amps, lights, smoke machines ... ) are equally spread on you distribution network. </p><p></p><p>an overvoltage of less than 10% normally should not affect our equipment, they are and should withstand 10% of overvoltage. Ground loops are an other common issue, people sometime lift the ground so we do not loop ...</p></blockquote><p></p>
[QUOTE="Othmane Alaoui, post: 83350, member: 1864"] Re: AC line loss causes hum When you have an unbalanced 3 phase network, it does happen that you get zero sequence issues, this imply the presence of the third harmonic at a certain level, 180Hz. The hum is not only at 60Hz but go very often higher. Even when we connect our stuff directly to 120Vac, the line (120ac) is part of either 240V LL or 208, 3 phases. its very important to always make sure your loads ( amps, lights, smoke machines ... ) are equally spread on you distribution network. an overvoltage of less than 10% normally should not affect our equipment, they are and should withstand 10% of overvoltage. Ground loops are an other common issue, people sometime lift the ground so we do not loop ... [/QUOTE]
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