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When reading circuit diagrams always start on the front page and then fallowed by the table of contents, from there you would have the whole idea of the circuit - section by section. It is common on the early pages you can see the guidance on how to read or navigate on the whole circuit diagrams
Read it from the very first page, start by understanding the table of contents and then move forward to diagram. In the circuit page review each component lying between different phase and neutral and try to understand their purpose. Based upon your analysis you will gain clarity of the circuit.
Observation and paying attention to small details is very important while reading circuit diagrams. Above all having the knowledge of electrical symbols of devices will add to it.
Practice makes perfect. The more you do, the better you'll become.
Knowing The Symbols of Any All Electrical Devices .
Knowing The Basics of Kirchhoff voltage low.
fallowed by the table of contents, from there you would have the whole idea of the circuit - section by section. In the circuit page review each component lying between different phase and neutral
knowing international standards like IEC,IEEE,ANCI etc.