<https://at3w.com/en/blog/atcontrol-lp-p-b-plus-protection-against-permanent-over-and-undervoltage-for-two-phase-power-lines/#primaryimage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://at3w.com/en/blog/atcontrol-lp-p-b-plus-protection-against-permanent-over-and-undervoltage-for-two-phase-power-lines/>