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Student & Learning Zone - City & Guilds
"Consecutive" Voltage Drops
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<blockquote data-quote="OnOff" data-source="post: 489181" data-attributes="member: 16173"><p>Felt best to post this here. I'm not sure, ran it by 3 sparks at works who all had a stab but weren't sure so here it is:</p><p></p><p>Declared single phase supply voltage can be 230V -6/+_10% so 216.6V at the lower end. Appendix F of the OSG says permissable drop is 3% for lighting &amp; 5% for other uses. But do you assume 3 or 5% below 230V or the actual measured voltage on site at the time of test, the issue then being that that figure can vary?</p><p></p><p>In the case of say a house supplying an outbuilding you would obviously take the origin voltage as being at the house.</p><p></p><p>Assuming then that you've calculated acceptable volt drop at the outbuilding, if at a later point in time you supply a further, remote building from this outbuilding (maybe with a smaller cable) do you take the origin voltage as being at the outbuilding now? I think so but am not sure.</p><p></p><p>Hope this makes sense. Apologies if a numpy question!</p></blockquote><p></p>
[QUOTE="OnOff, post: 489181, member: 16173"] Felt best to post this here. I'm not sure, ran it by 3 sparks at works who all had a stab but weren't sure so here it is: Declared single phase supply voltage can be 230V -6/+_10% so 216.6V at the lower end. Appendix F of the OSG says permissable drop is 3% for lighting & 5% for other uses. But do you assume 3 or 5% below 230V or the actual measured voltage on site at the time of test, the issue then being that that figure can vary? In the case of say a house supplying an outbuilding you would obviously take the origin voltage as being at the house. Assuming then that you've calculated acceptable volt drop at the outbuilding, if at a later point in time you supply a further, remote building from this outbuilding (maybe with a smaller cable) do you take the origin voltage as being at the outbuilding now? I think so but am not sure. Hope this makes sense. Apologies if a numpy question! [/QUOTE]
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"Consecutive" Voltage Drops
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