Every engineering office uses their own set of electrical symbols; however, the symbols below are fairly common across many offices. Refer to the legend sheet in your set of plans for special symbols used in a particular set.
Power Symbols
Duplex Receptacle
Weatherproof Duplex Receptacle
Ground Fault Circuit Interrupt Duplex Receptacle
Duplex Receptacle - One Receptacle Controlled by Switch
Duplex Receptacle on Emergency Branch
Double Duplex Receptacle (aka Quad Receptacle)
Switch
3-Way Switch
Switch with Built-In Dimmer
Power Panel
Lighting Panel
Junction Box
Recessed Floor Box
Through-Wall Sleeve
Lighting Symbols
2x2 Recessed Light
2x2 Recessed Light on Emergency Branch
2x4 Recessed Light
2x4 Recessed Light on Emergency Branch
Recessed Linear Light
Recessed Linear Light on Emergency Branch
Surface Mounted Utility Light
Track Lighting
Recessed Can Light
Wall Mounted Light
Recessed Wall Wash Light
Fire Alarm Symbols
Fire Alarm Pull Box
Fire Alarm Strobe and Horn Combination
Smoke Detector
Fire Department Key Box
Ceiling Mounted Exit Sign
Arrow Indicates Direction of Egress
Wall Mounted Exit Sign
Arrow Indicates Direction of Egress
Battery Powered Emergency Light
Security Symbols
Panic Button or Distress Button
Card Reader
Magnetic Door Lock
Electric Door Latch
Electric Door Strike
Security Camera
Communications Symbols
Telephone Jack
Data Jack
Data Jack for Wall Mounted Item
Combination Telephone and Data Jack
Ceiling Mounted Speaker
