What are the differences between 220VAC, 230VAC and 240VAC Mains Supplies and what voltage equipment should I use?. Schneider Electric [online]. 2018-05-04 [cit. 2019-09-25]. Dostupné online.
tzb-info.cz
energetika.tzb-info.cz
Elektrické sítě pro přenos energie. energetika.tzb-info.cz [online]. 2010-07-18 [cit. 2022-05-09]. Dostupné online.