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<blockquote data-quote="solarnovice" data-source="post: 494081" data-attributes="member: 32510"><p>Thank you ProDave, this confirms what i told the installer, they have come back with suggestion of 6mm steel wired armoured cable as it is the only one suitable for under ground (begs the question as to what sort of 4mm cable was laid initially) and voltage drop calculation as 3.942% (they have changed cable rating to D as i suggested). But surely that voltage drop is still way above the 'solar rise/drop' recommended of 1% and still likely to trip the inverter - the only thing 6mm will appear to do is bring the installer inline with BS7671?</p><p></p><p>Lately i found out about rural areas having unstable voltage and not much supply demand - something which should have been covered at sales/design/installation!</p></blockquote><p></p>
[QUOTE="solarnovice, post: 494081, member: 32510"] Thank you ProDave, this confirms what i told the installer, they have come back with suggestion of 6mm steel wired armoured cable as it is the only one suitable for under ground (begs the question as to what sort of 4mm cable was laid initially) and voltage drop calculation as 3.942% (they have changed cable rating to D as i suggested). But surely that voltage drop is still way above the 'solar rise/drop' recommended of 1% and still likely to trip the inverter - the only thing 6mm will appear to do is bring the installer inline with BS7671? Lately i found out about rural areas having unstable voltage and not much supply demand - something which should have been covered at sales/design/installation! [/QUOTE]
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