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Electrical Inspection & Testing Forum
High and low voltage 3 phase system
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<blockquote data-quote="apprentice87" data-source="post: 541442" data-attributes="member: 13534"><p>If the neutral is faulty, everything will SEEM fine until you apply a load. You would get 230 with everything disconnected You need to do a loop test from each phase to neutral and see what you get. If not about 0.2 or 0.3 you have a supply neutral fault.</p><p></p><p>Turn on the "faulty" circuit. Now go and measure all the phase to phase voltages and phase to neutral voltages at the board cutout and post back what you get. If the readings are not normal at the cutout, then it is obviously a problem with the supply..</p><p></p><p>I do not understand what you mean about the current running between two phases.. If you had that, the voltage across the load would be 415 or thereabouts, instantly destroying the load..</p><p></p><p>john..</p></blockquote><p></p>
[QUOTE="apprentice87, post: 541442, member: 13534"] If the neutral is faulty, everything will SEEM fine until you apply a load. You would get 230 with everything disconnected You need to do a loop test from each phase to neutral and see what you get. If not about 0.2 or 0.3 you have a supply neutral fault. Turn on the "faulty" circuit. Now go and measure all the phase to phase voltages and phase to neutral voltages at the board cutout and post back what you get. If the readings are not normal at the cutout, then it is obviously a problem with the supply.. I do not understand what you mean about the current running between two phases.. If you had that, the voltage across the load would be 415 or thereabouts, instantly destroying the load.. john.. [/QUOTE]
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