LED Strip Symbol
Definition: The LED Strip symbol represents a flexible low-voltage tape of series-parallel LED groups — drawn as a long thin rectangle containing LED (diode-with-arrows) marks and dashed cut lines — with two polarity-sensitive terminals (12V+ and GND) fed from a Class 2 LED driver, per IEC 60617 LED symbol conventions and UL 2108 / UL 8750 low-voltage lighting practice.
Also known as: LED tape light, LED ribbon light, strip light, 12V LED strip, 24V LED strip, SMD 5050 strip, COB LED strip, under-cabinet tape light.
What the LED Strip symbol means
The LED Strip symbol denotes a flexible printed-circuit ribbon populated with surface-mount LEDs and current-limiting resistors, powered by low-voltage DC — most commonly 12 V or 24 V. The strip is organized into repeating segments (typically three LEDs plus a resistor per segment on a 12 V strip, six LEDs on a 24 V strip); each segment is an independent series string, and all segments sit in parallel across the strip's + and − rails. This segment structure is why strips can be cut to length, but only at the marked cut lines between segments.
Because the LEDs are diodes, the strip is polarity sensitive: connecting 12V+ and GND backwards produces no light (and no damage on plain single-color strips, since the LEDs simply block). The symbol's dashed cut-line marks and diode arrows communicate the two facts an installer needs from a diagram: where the strip may be cut, and which conductor is positive.
How to identify the LED Strip symbol
In wiring diagrams the LED strip is drawn as a long, thin rectangle with several LED symbols inside — the IEC 60617 diode triangle-and-bar with two small arrows radiating from it — and dashed vertical lines marking the cut points. The two pins exit one end, labelled with the supply polarity (12V+ or 24V+, and GND/−). RGB and RGBW variants are drawn the same way but with 4 or 5 pins (V+, R, G, B, and W), because color strips switch each color channel's cathode line, not the common positive.
There is no dedicated ANSI symbol for an LED strip; both IEC- and ANSI-style diagrams improvise from the standard LED symbol, so the elongated outline, repeated diode marks, and cut lines are the identifying features. Do not confuse it with an addressable strip (WS2812/NeoPixel style), which adds a third Data pin and cannot be dimmed with a simple PWM voltage dimmer.
Live editor identity: Live-library identity: `led-strip`, 70 × 20 canvas units, 2 logical terminals. Match this exact SVG and terminal list when identifying the placeable editor symbol; do not identify a physical package from the schematic outline alone.
Function and usage boundary
The strip converts constant DC voltage into light through parallel banks of resistor-ballasted LED strings. Feed 12 V (or 24 V) across the rails and every segment conducts its designed current — typically about 20 mA per string on classic SMD 5050 strips. Total current scales linearly with length: a strip rated 3 W per foot draws 0.25 A per foot at 12 V, so a 16.4 ft (5 m) reel is roughly 4 A. This is why the power source must be a constant-voltage LED driver sized with 20% headroom, and why long runs are fed from both ends or in a star topology.
Voltage drop along the strip's thin copper rails is the dominant design constraint: past roughly 16 ft at 12 V (or about 32 ft at 24 V for equivalent gauge), the far end visibly dims and shifts color. The fixes are higher voltage strips (24 V or 48 V), heavier feed wire, injection points every 15–30 ft, or COB strips with better rail copper. Dimming is done by PWM on the DC side (a low-voltage PWM dimmer or smart controller), or by a TRIAC-dimmable driver on the AC side driving the strip at full DC.
Usage boundary: Use the LED Strip abstraction only when the intended circuit can be expressed through these logical ports: `pos` (12V+), `neg` (GND). Select a versioned physical profile and exact manufacturer datasheet before assigning package pins, ratings, or fabrication dimensions.
Standards: IEC vs ANSI
| IEC 60617 | IEC 60617 supplies the LED symbol (diode with radiating arrows) used within the strip outline. Strip and driver safety in IEC territory falls under IEC 60598 (luminaires) and IEC 61347-2-13 (DC/AC electronic control gear for LED modules); SELV limits from IEC 61140 keep 12/24 V strips in the safety-extra-low-voltage class. |
|---|---|
| ANSI/IEEE 315 | In North America, LED strips ('LED tape light') are listed to UL 2108 (low-voltage lighting systems) with drivers under UL 8750 (LEDs in lighting products). Installation follows NEC Article 411 (low-voltage lighting, 30 V or less) and NEC 725 Class 2 circuit limits — 60 W maximum at 12 V, 100 VA at higher Class 2 voltages — which is why large installs are split across multiple Class 2 driver outputs. |
| Key difference | There is no drawing difference of substance — both systems improvise the strip from the standard LED symbol. The practical difference is regulatory: US practice leans on NEC Article 411/Class 2 power limits (driving the multi-output driver architecture), while IEC practice classifies the same strips as SELV LED modules under IEC 61347/60598. Symbol-wise, always check pin count: 2 pins = single color, 4 = RGB, 5 = RGBW, 3 = addressable data strip. |
The displayed SVG is the live editor implementation, not a licensed reproduction or certification of an IEC or IEEE database glyph. Verify the exact official entry and project edition before issuing work.
Variant availability
- Editor implementation (available): This is the exact SVG and terminal geometry placed by the CircuitDiagramMaker editor.
- IEC 60617 (reference only): IEC 60617 is the official international source. This page does not present the editor SVG as a licensed or certified IEC reproduction.
- ANSI/IEEE 315 (reference only): IEEE 315 is the North American reference listed by IEEE as inactive-reserved; use the edition required by the project.
Logical terminals
The live editor exposes `pos` (12V+), `neg` (GND). These are stable logical terminal IDs for diagram connectivity, not a promise that they equal physical package pin numbers.
| Logical ID | Editor terminal name |
|---|---|
| pos | 12V+ |
| neg | GND |
Polarity and direction
Polarity or supply meaning is encoded on `neg` = GND. Do not reverse these logical connections, and verify the physical package pin number in the exact device datasheet.
Reference designator
Project-defined: No single reference letter is asserted for this broad symbol. Apply the project standard and equipment-classification rules consistently.
Where the LED Strip symbol is used
- Under-cabinet task lighting in kitchens, fed from a driver in an adjacent cabinet or above the wall cabinets
- Cove, toe-kick, and tray-ceiling accent lighting in living spaces, usually on a PWM or smart dimmer
- Closet and pantry lighting, often switched by a door contact or PIR motion sensor
- TV/desk bias lighting and gaming setups (single color, RGB, or addressable variants)
- Vehicle, RV, and marine 12 V accent lighting running directly from the battery bus through a fuse
- Retail displays, shelving, and signage, where aluminum channel with a diffuser doubles as a heatsink
Key facts
- LED strips are polarity-sensitive DC loads: reversed + and − simply produces no light on single-color strips because the LEDs block.
- Strips can only be cut at the marked cut lines (every 3 LEDs on 12 V strips, every 6 on 24 V), because each segment is a complete series string with its own resistor.
- Current scales with length — about 0.25 A per foot at 12 V for a 3 W/ft strip — so size the constant-voltage driver with at least 20% headroom.
- Voltage drop limits a single 12 V feed to roughly 16 ft (5 m); go to 24 V, heavier feed wire, or inject power at multiple points for longer runs.
- Pin count identifies the type: 2 pins = single color, 4 = RGB (common anode V+), 5 = RGBW, 3 pins (V+, GND, Data) = addressable (WS2812/SK6812 class).
- US installs fall under NEC Article 411 and Class 2 limits (max 60 W per output at 12 V), which is why big projects use multi-output drivers.
- Dim single-color strips with a DC-side PWM dimmer or a TRIAC-dimmable driver — never a standard AC wall dimmer directly on a non-dimmable driver.
- COB (chip-on-board) strips give a continuous dot-free light line and generally tolerate longer runs than discrete SMD 5050/2835 strips.
Common interpretation mistakes
- Treating the LED Strip drawing (70 × 20 canvas units) as a physical footprint. The schematic outline expresses electrical intent; package and panel dimensions come from the selected physical profile.
- Copying `pos`, `neg` directly to a wire marker or manufacturer package pin number. These are logical LED Strip port IDs and require an exact ordered-part terminal map.
- Reversing a polarity-marked LED Strip terminal because the symbol was rotated or mirrored on the sheet.
Frequently asked questions
What does the LED strip symbol look like in a wiring diagram?
A long thin rectangle containing repeated LED symbols — the diode triangle-and-bar with two small radiating arrows from IEC 60617 — plus dashed vertical lines marking the cut points. Two labelled pins (12V+/24V+ and GND) exit one end. RGB versions show 4 pins and RGBW 5; a third 'Data' pin means it is an addressable strip, which is a different animal electrically.
Can I cut an LED strip anywhere?
No — only at the marked cut lines (usually a dashed line with scissor icon and solder pads). Each segment between cut lines is a complete series circuit of LEDs plus a resistor; cutting mid-segment kills that segment's LEDs. Cut intervals are typically every 3 LEDs (about 2–4 inches) on 12 V strips and every 6 LEDs on 24 V strips.
What is the difference between 12V and 24V LED strips?
24 V strips run half the current for the same wattage, so they suffer less voltage drop and support runs about twice as long (roughly 32 ft vs 16 ft from a single feed) with finer-looking results at the far end. 12 V strips have shorter cut intervals (every 3 LEDs vs 6) and suit vehicles and battery systems. Never connect a 12 V strip to a 24 V supply — it will burn out the LEDs.
Why does my LED strip get dimmer at the far end?
Voltage drop in the strip's thin copper power rails. Every foot of strip carries the current of all the segments beyond it, so the voltage sags along the run and the far LEDs receive less than rated voltage. Fixes: feed the strip from both ends, add power-injection feeds every 15–30 ft, use heavier feed wire, or switch to a 24 V or 48 V strip.
What power supply do I need for an LED strip?
A constant-voltage DC driver matching the strip voltage (12 V or 24 V), rated at least 20% above the strip's total wattage. Compute wattage as the strip's W-per-foot (or W-per-meter) times the run length — e.g. 13 ft of 3 W/ft strip = 39 W, so use a 50–60 W driver. For US installs, a UL-listed Class 2 driver keeps the wiring under NEC low-voltage rules.
What is the difference between an LED strip and an addressable (WS2812) strip?
A standard strip lights every LED identically from a constant-voltage supply and dims via PWM on the whole rail. An addressable strip has a driver IC per LED (or per group) and a third Data pin carrying a serial protocol from a microcontroller, letting every pixel show a different color. Addressable strips usually run at 5 V or 12 V and cannot be controlled by a simple analog/PWM dimmer.
Sources and verification
- IEC 60617:2026 DB — Graphical symbols for diagrams (International Electrotechnical Commission) — The current official IEC graphical-symbol database and the electrotechnical areas it covers. Exact symbol identity data requires IEC access.; claim scope: standards
- IEEE/ANSI 315-1975 — Graphic Symbols for Electrical and Electronics Diagrams (IEEE Standards Association) — The official catalogue record for North American diagram symbols and reference-designation letters; IEEE lists the standard as inactive-reserved.; claim scope: standards, reference_designator
- IEC 61666:2010+AMD1:2021 — Identification of terminals within a system (International Electrotechnical Commission) — General principles for identifying terminals within systems; it does not replace the exact ordered-device datasheet.
- IEC 81346-2:2019 — Object classes and reference-designation codes (International Electrotechnical Commission) — The official classification scheme used to form reference designations across technical disciplines.; claim scope: reference_designator
- IEC 61082-1:2014 — Preparation of documents used in electrotechnology (International Electrotechnical Commission) — General presentation rules for electrotechnical diagrams, drawings, and tables.; claim scope: standards, usage
Geometry fingerprint: 5d98befff6acc77d. A changed SVG, canvas size, or terminal definition invalidates the recorded review.
Related symbols
- DC Barrel Jack symbol
- LED symbol
- Low Voltage Transformer symbol
- RGB LED (4-pin) symbol
- Under-Cabinet Light symbol
- WS2812 Addressable LED symbol
Physical breadboard, PCB, and panel mapping
No universal physical profile is published for this symbol yet. Create a versioned custom part from the exact manufacturer dimensions and terminal map before fabrication.
Place the LED Strip symbol directly on a wiring diagram or schematic in the free online editor — no download required.