15.Electrical legend single line & schematic symbols

electrical schematic symbols
electrical symbol legend
single line
– load break switch
– current transformer
– c/w ratio
– and quantity
– digital metering
– shunt trip circuit breaker
– fused cutout switch
– unfused disconnect switch
– draw out circuit breaker
– circuit breaker
– distribution transformer
– fused disconnect switch
– lightning arrester
– frame size indication
– power circuit breaker c/w
– surge arrester
– transformer
– zero sequence current
– potential transformer c/w
– voltage ratio and quantity
– capacitor c/w kvar rating
– thermal overload device
– contact
– limiters
– circuit breaker c/w current
– fuse
– special outlet
– harmonic filter kw rated
– electric motor c/w kw rating
– stab type disconnect
– terminal
– weatherhead
– cable termination
– bus bar with connection
– conductor
line symbols
– overhead conductor
– key interlocking
– equipment outline
– underground conductor
– tripping or interlocking circuit
– delta
– grounded neutral
– wye or star with solid
– current indicated
– wye or star with resistance
– grounded neutral and maximum
– feeder identification symbol
– 3 phase transformer connection symbols
– thermistor
– resistor
– s – stall. g – ground. t – temperature.
– by a letter suffix. e. g.
– specialized relay function are indicated
– synchronization check relay
– reverse power relay
– ac thermal overload relay
– incomplete sequence relay
– phase sequence relay
– phase balance current relay
– loss of field protection relay
– directional power relay
– ac under voltage
– differential current relay
– lockout relay
– phase angle measuring relay
– ac over voltage relay
– ac circuit breaker
– under frequency relay
– sudden pressure relay
– ac instantaneous overcurrent
– relay
– ac time delay overcurrent relay
– switch gear device number and functions
– schematic
– momentary pushbutton (n.o.)
– momentary pushbutton (n.c.)
– p (pressure), etc.
– fourth letter:
– second letter:
– o (on)
– variable, e.g. l (level),
– h (high) or l (low) optiona
– c (close) or 0 (open)
– switch symbol
– switch function descriptor, placed below
– limit switch (n.o.)
– vibration switch (n.o.)
– temperature switch (n.o.)
– pressure switch (n.o.)
– flow switch (n.o.)
– level switch (n.o.)
– limit switch (n.c.)
– vibration switch (n.c.)
– temperature switch (n.c.)
– pressure switch (n.c.)
– flow switch (n.c.)
– level switch (n.c.)
– time delay close on de-energize
– n.c. contact
– n.o. contact
– time – delay relay (typ.) coil
– motor control relay (typ.) coil
– control relay 284 (typ.) coil
– time delay open on de-energize
– time delay open on energize
– time delay close on energize
– fuse
– field wiring
– anel wiring
– breaker
– control panel terminal
– mcc terminal
– field terminal
– switch gear
– field junction box terminal
– equipment control panel
– 3 position maintained selector switch
– 2 position maintained selector switch
– third letter:
– first letter:

I also suggest downloading Electric Symbols.

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