Electrical symbols for solar drawings
Nothing in the NEC says which symbols to draw. What the NEC does say — repeatedly — is that the drawing must be clear enough for the installation to be evaluated. Standard symbols are how you get there, and a reviewer who recognises everything on your sheet reviews it faster and more generously.
The symbols that appear on almost every PV sheet
| Device | Convention |
|---|---|
| PV module / array | Rectangle with diagonal irradiance arrows; dashed boundary around the string |
| Disconnecting means | Break in the line with a hinged blade; add a box for enclosed/fused |
| Fuse | IEEE: rectangle in line. IEC 60617: rectangle with a centre bar |
| Circuit breaker | Contact with a hooked operator; two-pole shown ganged |
| Inverter | Square split diagonally, DC waveform one side, AC sine the other |
| Meter | Circle with M, or kWh for a revenue meter |
| Ground / electrode | Descending horizontal bars; the electrode type stated in text |
| Battery / ESS | Alternating long and short plates |
Where IEEE and IEC differ enough to matter
- Fuses. IEC uses a plain rectangle bisected by the conductor; IEEE tends toward a rectangle or a distinctive s-curve. Both are read correctly by US reviewers, but mixing them on one sheet is not.
- Disconnects. IEC distinguishes isolators from load-break switches more strictly. On a residential PV sheet the distinction rarely changes the review, but labelling the device by function — "AC disconnect, fused, service-entrance rated" — removes any doubt.
- Transformers. IEC's two-circle winding symbol is near-universal now, including in US practice.
A legend is not optional
Whatever you draw, put a legend on the sheet. Reviewers do not memorise your conventions, and a legend converts an ambiguous glyph into a stated fact. It also protects you: if a symbol is unusual but defined, you have documented intent.
Decoration costs you time
Attractive isometric equipment icons look modern and read slowly. A reviewer scanning forty sheets a day is pattern-matching, and anything that breaks the pattern gets a second look — sometimes followed by a comment. Save the illustration for the customer proposal; submit the standard symbols.
This is why OneLine Studio ships an IEEE 315 / IEC 60617 symbol mode alongside its styled view: design in whichever reads better on screen, then flip to standards symbols for the submittal set. Same model, different rendering.
Practical rules
1. One standard per set. Do not mix IEEE and IEC glyphs across sheets. 2. Label by function as well as symbol. "DC disconnect, 600 V, 30 A" beats a glyph alone. 3. Keep line weights consistent. Power heavier than control; comms dashed. 4. Do not invent a symbol for something that has one. 5. Show the ground symbol at the electrode, not floating near the panel.
See also: how to draw a one-line and one-line vs three-line.
> Design aid — a licensed electrician or PE must review and stamp before filing.
FAQ
What symbol standard do solar drawings use?
IEEE 315 in the United States and IEC 60617 internationally. They overlap heavily; the differences that matter on a PV sheet are the disconnect, the fuse and the transformer.
Do I have to use standard electrical symbols on a permit set?
The NEC does not mandate a symbol standard, but plan reviewers read standard symbols instantly and unfamiliar ones slowly. A legend is required either way.
What symbol is used for a PV module?
A rectangle with a diagonal arrow pair indicating irradiance, usually with the array boundary drawn as a dashed enclosure around the string.
Related: Drawings & documentation
Educational reference, reviewed 2026-07. A design aid, not a substitute for a licensed electrician or PE. Confirm the enforced NEC edition and local amendments with your AHJ.
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