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Zero break in three-phase installations can cause burning of electrical consumers due to an increase in voltage on them. That is why it is desirable to install a protective device that will prevent this. ELECTRICIAN 1 BOOKS Electrician 1 - manual for students and masters - 1,300 din - basic and necessary topics from the world of electricity https://goo.gl/gHYEfD Sketches and diagrams - 1,300 din - the most important circuit diagrams for practical application of knowledge Delivery to home address , cash on delivery payment. Ordering via email [email protected] Link for donations: https://www.paypal.me/SreckoAndrijanic Visit my Facebook page for more details: / elektricar1 Subscribe to my YouTube channel, to be notified immediately about new video material: / @elektricar1 Danko Andrijanic, ing. el. teacher of practical classes of electrical department First Technical School Kragujevac phone: 064/146-145-8 e-mail: [email protected]