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– lower case letter indicates control circuit switch leg – branch circuit conduit concealed in slab, underground or under floor. conduit shall include phase, neutral and ground conductors as required for circuits (unless otherwise noted). – branch circuit conduit concealed above ceiling or in wall. – branch circuit panelboard, over 250 volts, flush mounted – branch circuit panelboard, over 250 volts, surface mounted – branch circuit panelboard, under 250 volts, flush mounted – branch circuit panelboard, under 250 volts, surface mounted – combination magnetic motor starter, size as noted 3 pole unless otherwise noted – non-fused disconnect switch, size as noted nf denotes non-fused – magnetic motor starter or contactor size as noted – shunt-trip button – flush mounted unless otherwise noted nema 3r for exterior locations – plug-in strip with receptacles, 18″ o.c. – tick marks shown on any device represents receptacle connected to the emergency circuit (red device) typical for any device in legend – isolated ground duplex receptacle, (orange device) – two duplex receptacles with common cover mounted above counter coordinate with ewc installer for mounting height) – simplex receptacle (ewc denotes electric water cooler. – duplex safety receptacle mount coverplates with spanner head screws – duplex receptacle with each half on separate circuit (breaker shall be two pole with common trip) – floor outlet box with two duplex receptacles and one combination w/ voice/data outlet – floor outlet box and duplex receptacle with appropriate flange. – surge protection type (tvss) duplex receptacle – dimmer switch (1500 watts unless otherwise indicated) – manual motor starter with overload heaters and pilot light – single pole switch with weatherproof locking cover – single pole switch with weatherproof cover – single pole switch (subscript indicates item controlled) – fire alarm annunciator panel – flush mounted – pipe clamp for plumbing vent thru roof. – fluorescent, or incandescent wall washer. – hid, fluorescent, or incandescent fixture – manual motor starter with overload heaters – single pole switch with security locking key – duplex receptacle mounted above counter – duplex receptacle with top half switched – two duplex receptacles with common cover – photocell, mounted on roof facing north – special purpose receptacle, rating as noted – motor connection, number denotes horsepower 55.Electrical symbol legend AutoCAD Blocks 55.Electrical symbol legend AutoCAD Blocks