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NEC 690
Validated against the standard.
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How it works
Enter your values
Type in your inputs — the app fills code tables and constants for you, so there's nothing to look up.
Get a code-checked result
Instant answer with a clear PASS / FAIL and the exact NEC 690 reference behind every number.
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What this reference does
NEC Article 690 governs solar PV systems, and the key sections come up on every job. This app is a quick, offline reference to the Article 690 rules installers reach for most — no flipping through the code book on a roof.
Sections it covers
- 690.7 — maximum PV system voltage (cold-temperature Voc correction).
- 690.8 — circuit current and conductor sizing (the 1.25 and 1.25 factors).
- 690.12 — rapid shutdown of PV systems on buildings.
- 690.13 / 690.15 — disconnecting means.
- 690.31 — wiring methods and conductor types.
- 690.41 / 690.43 — system grounding and equipment bonding.
Why it helps
When an inspector asks where you got a 156% conductor factor or a rapid-shutdown boundary, you can point to 690.8(B) or 690.12 directly — the reference keeps the article numbers at hand.
Related calculators
Apply the rules with the solar wire sizing and inverter sizing calculators.
NEC 690 reference FAQ
What does Article 690 cover?
It is the NEC article specific to solar photovoltaic systems — voltage, current and conductor sizing, disconnects, rapid shutdown, wiring methods, and grounding.
What is rapid shutdown?
NEC 690.12 requires a way to quickly de-energize PV conductors on or in a building so firefighters are not exposed to live conductors. The reference summarizes the boundary and voltage limits.
Is it a substitute for the code book?
It is a fast field reference to the most-used sections; always confirm against the adopted NEC edition and local amendments for final design.
Does it work offline?
Yes, it runs 100% offline with no account. Free with rewarded ads; a one-time $2.99 Pro unlock adds PDF export and saved history.
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Free with rewarded ads · $2.99 lifetime Pro · iOS & Android. Works 100% offline on the job site.