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Do-It-Yourself (DIY) Question & Answer Forum
Low Mains Voltage (~190-220v) - How to resolve?
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<blockquote data-quote="SPECIAL LOCATION" data-source="post: 503765" data-attributes="member: 250"><p>{ You answered whilst I was doing some corrections to my calculations.. (reading wrong lines off the volt-drop tables).. }</p><p></p><p>Anyway..</p><p></p><p>I think you need full review of all of your circuits..</p><p></p><p>cable sizes..</p><p></p><p>expected loads etc..</p><p></p><p>As there are tables in the wiring regs where the expected volt-drops can be calculated..</p><p></p><p>Once you know what your expected volt drops for each circuit are..</p><p></p><p>You can then assess if the voltages you are actually reading are within spec..</p><p></p><p>Without that actual info and calculations you have very little ammunition to get the DNO to do anything..</p><p></p><p>It sounds to me like a classic problem of various bits being added or uprated over the years without an accurate re-assessment of loading and volt-drop effects on the overall installation.</p><p></p><p>e.g. Two circuits run over long cables may be ok in themselves.. but if both are on together the combined load also increases the volt drop at the supply cable coming to your meter..</p><p></p><p>You almost need to treat this like a reverse design exercise..</p><p></p><p>taking loads and distances from source to see what cable sizes should be needed to comply with BS7671 volt-drop regulations.</p></blockquote><p></p>
[QUOTE="SPECIAL LOCATION, post: 503765, member: 250"] { You answered whilst I was doing some corrections to my calculations.. (reading wrong lines off the volt-drop tables).. } Anyway.. I think you need full review of all of your circuits.. cable sizes.. expected loads etc.. As there are tables in the wiring regs where the expected volt-drops can be calculated.. Once you know what your expected volt drops for each circuit are.. You can then assess if the voltages you are actually reading are within spec.. Without that actual info and calculations you have very little ammunition to get the DNO to do anything.. It sounds to me like a classic problem of various bits being added or uprated over the years without an accurate re-assessment of loading and volt-drop effects on the overall installation. e.g. Two circuits run over long cables may be ok in themselves.. but if both are on together the combined load also increases the volt drop at the supply cable coming to your meter.. You almost need to treat this like a reverse design exercise.. taking loads and distances from source to see what cable sizes should be needed to comply with BS7671 volt-drop regulations. [/QUOTE]
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Low Mains Voltage (~190-220v) - How to resolve?
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