Some graphics, characters, symbols, codes, functions and functions in the complete power distribution system
Relevant national standards meaning:
In the complete power distribution system, the working and control voltages are distinguished by alternating current (AC) direct current (DC), "J, Z", AC, DC, (+, -), the AC rated voltage is 380V, 220V, 10KV, 6KV, referred to as low pressure and high pressure. Circuit diagrams include primary system diagrams, electrical plane layout diagrams, control protection diagrams (also called schematic diagrams), and secondary wiring installation diagrams. As those who participate in production and install complete sets of products, we should know, understand, and be familiar with most graphics, text, Symbol, code, function and function, meaning.
The meaning of symbols commonly used in electrical construction drawings:
U: voltage, unit "V"
I: current, unit "A"
R: resistance, unit "Ω"
U: rated voltage
UE: rated operating voltage
UI: rated insulation voltage
UC: rated auxiliary circuit voltage
IE: rated working current
I: instantaneous current value
ICW: rated short-time variable current
COSΦ: power factor
IP: enclosure protection level
PE: protective conductor
N: neutral conductorPEN：