Circuit Diagram Symbols and Common Electrical Faults
For the measurement of current, voltage, etc., many people know that a multimeter should be used. Generally, a multimeter can measure DC current, DC voltage, AC voltage, resistance, and audio level, etc. Some can also measure AC current, capacitance, inductance, and some parameters of semiconductors. It is a very practical tool, but for beginners, how to use a multimeter is a difficult problem. Below, the editor will talk about the usage methods and precautions of the multimeter.
If you want to learn electrical knowledge, you must read the most complete common electrical circuit symbols and common electrical circuit faults introduced below, hoping to help you.
1. Common electrical circuit symbols
Ammeter PA
Voltmeter PV
Active energy meter PJ
Reactive energy meter PJR
Frequency meter PF
Phase meter PPA
Maximum demand meter (load monitor) PM
Power factor meter PPF
Active power meter PW
Reactive power meter PR
Reactive current meter PAR
Audible signal HA
Visual signal HS
Indicator light HL
Red light HR
Green light HG
Yellow light HY
Blue light HB
White light HW
Connecting piece XB
Plug XP
Socket XS
Terminal board XT
Wire, cable, busbar W
DC busbar WB
Plug-in (feed) busbar WIB
Power branch line WP
Lighting branch line WL
Emergency lighting branch line WE
Power main line WPM
Lighting main line WLM
Emergency lighting main line WEM
Trolley wire WT
Closing small busbar WCL
Control small busbar WC
Signal small busbar WS
Flash small busbar WF
Accident sound small busbar WFS
Warning sound small busbar WPS
Voltage small busbar WV
Emergency lighting small busbar WELM
Fuse FU
Fast fuse FTF
Drop-out fuse FF
Voltage limiting protection device FV
Forward rotation button SBF
Reverse rotation button SBR
Stop button SBS
Emergency button SBE
Test button SBT
Reset button SR
Limit switch SQ
Proximity switch SQP
Manual control switch SH
Time control switch SK
Liquid level control switch SL
Humidity control switch SM
Pressure control switch SP
Speed control switch SS
Temperature control switch, auxiliary switch ST
