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1. I want to install water heater 8kW, separate circuit. Do I need put a switch between Fuse board and water heater? 2. another problem - 14kW water heater 3 phase, this is 21A, how to find right fuse? in 17Th edition there are values for U=230V,where to find max earth fault loop...

Can I put cable above doorway in wall between 150mm from ceiling? regards