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Power cables for street lighting installations
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<blockquote data-quote="apprentice87" data-source="post: 457839" data-attributes="member: 13534"><p>Ok. well here is what i would be thinking, but i am no electrician!!</p><p></p><p>Now, you will have two big problems with TNCS in such situations..</p><p></p><p>1, The "perceived shock" thingy.. This could be dealt with by lots of rods, close enough together so that their areas overlap [or mesh in the ground, even better].. What i mean is, so as to ensure that all the ground area around any exposed conductive parts, is all at the same earth potential, as the exposed parts, which, as the supply is TNCS, might be quite different to "true" earth potential..</p><p></p><p>2, Next problem is a lost supply neutral. It would be nice to think that with all these rods/mesh whatever, that in the event of a lost neutral, that the combined effect of all the rods, would drag the touch voltage down to a safe level, but i doubt that very much.</p><p></p><p>Ok, stand by to laugh....Could not a device be rigged up, that measures, or monitors any PD between neutral, and say "true" earth, like a rod 100 yards away, and, if this PD rises to more than a few volts, cuts off the both the phase conductor AND the neutral... Hmm, oh yes, i do believe there already is one, an ancient VOELCB only one that worked with a difference of about 5 or 6 volts..</p><p></p><p>john..</p></blockquote><p></p>
[QUOTE="apprentice87, post: 457839, member: 13534"] Ok. well here is what i would be thinking, but i am no electrician!! Now, you will have two big problems with TNCS in such situations.. 1, The "perceived shock" thingy.. This could be dealt with by lots of rods, close enough together so that their areas overlap [or mesh in the ground, even better].. What i mean is, so as to ensure that all the ground area around any exposed conductive parts, is all at the same earth potential, as the exposed parts, which, as the supply is TNCS, might be quite different to "true" earth potential.. 2, Next problem is a lost supply neutral. It would be nice to think that with all these rods/mesh whatever, that in the event of a lost neutral, that the combined effect of all the rods, would drag the touch voltage down to a safe level, but i doubt that very much. Ok, stand by to laugh....Could not a device be rigged up, that measures, or monitors any PD between neutral, and say "true" earth, like a rod 100 yards away, and, if this PD rises to more than a few volts, cuts off the both the phase conductor AND the neutral... Hmm, oh yes, i do believe there already is one, an ancient VOELCB only one that worked with a difference of about 5 or 6 volts.. john.. [/QUOTE]
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