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Electrician Talk Forum
help - so far outside the norm I need a sanity check!
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<blockquote data-quote="opentoideas" data-source="post: 415617" data-attributes="member: 27449"><p>well I have just come across another oddity.</p><p></p><p>for the moment I am wiring up the generator side as a stand alone 3 phase supply and I have come across something interesting...</p><p></p><p>the generator came from a mobile seed dresser (stand alone piece of agricultural equipment) the set and its controls were put together by what looks like a reputable company that specialise in industrial generator supply so I was assuming all would be correct however as I am replacing the engine control system and distribution I have found that there is no N-E link installed.</p><p></p><p>the generator output as supplied went to a 63A MCB then a 30mA RCD then presumably then directly fed the machine possibly through another distribution board.</p><p></p><p>there are bonding links between the engine housing and control panel but no continuity between the N and bonded parts.</p><p></p><p>it is possible that a N-E link was installed downstream but to my mind this would be less than ideal and defeat the point of the fitted RCD.</p><p></p><p>everything I have found points to the system having a N-E link installed as close to the star point as possible and I had expected to find this already in place however not finding it has made me question my logic.</p><p></p><p>as it stands there is no current path for a live to ground fault and given that the generator itself and presumably the machine it was attached to would all be extraneous conductive parts this just seems wrong.</p><p></p><p>how likely would it be that this was installed with a N-E link at the machine side rather than at supply?</p></blockquote><p></p>
[QUOTE="opentoideas, post: 415617, member: 27449"] well I have just come across another oddity. for the moment I am wiring up the generator side as a stand alone 3 phase supply and I have come across something interesting... the generator came from a mobile seed dresser (stand alone piece of agricultural equipment) the set and its controls were put together by what looks like a reputable company that specialise in industrial generator supply so I was assuming all would be correct however as I am replacing the engine control system and distribution I have found that there is no N-E link installed. the generator output as supplied went to a 63A MCB then a 30mA RCD then presumably then directly fed the machine possibly through another distribution board. there are bonding links between the engine housing and control panel but no continuity between the N and bonded parts. it is possible that a N-E link was installed downstream but to my mind this would be less than ideal and defeat the point of the fitted RCD. everything I have found points to the system having a N-E link installed as close to the star point as possible and I had expected to find this already in place however not finding it has made me question my logic. as it stands there is no current path for a live to ground fault and given that the generator itself and presumably the machine it was attached to would all be extraneous conductive parts this just seems wrong. how likely would it be that this was installed with a N-E link at the machine side rather than at supply? [/QUOTE]
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help - so far outside the norm I need a sanity check!
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