Common Symbols
Wiring and Conduit
Safety Devices
Panels & Power
Miscellaneous
100

This symbol stands for a light fixture.

What is LT or LUM?

100

Abbreviation for Non-Metallic Sheathed Cable.

What is NM?

100

Circuit Breaker abbreviation.

What is CirBkr?

100

This stands for an electrical panel.

What is PNL?

100

Ground is often abbreviated like this.

What is GND?

200

This is the abbreviation for a wall switch.

What is SW?

200

This abbreviation stands for Electrical Metallic Tubing.

What is EMT?

200

Ground Fault Circuit Interrupter.

What is GFCI?

200

Distribution Panelboard abbreviation.

What is DP?

200

Weatherproof abbreviation.

What is WP?

300

You’ll find this symbol near outlets.

What is REC or R?

300

Refers to Metal-Clad cable.  

What is MC?

300

Arc Fault Circuit Interrupter.

What is AFCI?

300

Transformer abbreviation.

What is XFMR?

300

This abbreviation is for a motion sensor.

What is MS?

400

This abbreviation represents a fuse.

What is F?

400

Flexible Metal Conduit.

What is FMC?

400

Equipment Grounding Conductor.

What is EGC?

400

A subpanel is often abbreviated this way.

What is SPNL or SUB?

400

Recessed Can Light abbreviation.

What is RCL or RLT?

500

Used to show a junction box.

What is JB or J-BOX?

500

This is for Rigid Metal Conduit.

What is RMC?

500

Disconnect Switch abbreviation.

What is DS?

500

Load Center abbreviation.

What is LC?

500

Emergency circuit abbreviation.

What is EM?