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Do-It-Yourself (DIY) Question & Answer Forum
Help to Interpret a Regulation ?
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<blockquote data-quote="apprentice87" data-source="post: 484473" data-attributes="member: 13534"><p>Ok, here is one for all you proper electricians to ponder over..</p><p></p><p>The RCD compares what goes down the phase conductor and compares it to what is flowing in the neutral. [Given that this is the case then, God knows how three phase ones work as neutral current could vary from nothing to lots depending on phase loading..]</p><p></p><p>Anyway, say the "old" sort of welder with the earthed secondary. At a guess, i would think they would be fine with an RCD, as that is on the supply side, but if mr welder left the welding return lead off, would not the old type of VOELCB trip instantly?? I presume it would depend on the impedance of the earthing arrangements and the magnitude of the welding current that flowed down them, [before they fried!!] Ohms law and all that!!</p><p></p><p>john..</p></blockquote><p></p>
[QUOTE="apprentice87, post: 484473, member: 13534"] Ok, here is one for all you proper electricians to ponder over.. The RCD compares what goes down the phase conductor and compares it to what is flowing in the neutral. [Given that this is the case then, God knows how three phase ones work as neutral current could vary from nothing to lots depending on phase loading..] Anyway, say the "old" sort of welder with the earthed secondary. At a guess, i would think they would be fine with an RCD, as that is on the supply side, but if mr welder left the welding return lead off, would not the old type of VOELCB trip instantly?? I presume it would depend on the impedance of the earthing arrangements and the magnitude of the welding current that flowed down them, [before they fried!!] Ohms law and all that!! john.. [/QUOTE]
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Help to Interpret a Regulation ?
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