NEC 690 Reference

ZkDev

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About this app

NEC 690 Reference is a study and field companion for solar PV professionals working under the National Electrical Code Articles 690, 691, 705, 706, and 710. All content is paraphrased educational summary, designed for quick lookups, exam preparation, and inspection support — fully offline.

# Library (v1.1.0)

- 60 NEC section summaries across Articles 690 (PV Systems), 691 (Large-Scale PV), 705 (Interconnection), 706 (Energy Storage), and 710 (Stand-Alone Systems)
- 31 plain-language definitions of NEC terms: PV source circuit, PV output circuit, MPPT, rapid shutdown, AHJ, NRTL, qualified person, listed, labeled, and more
- 10 step-by-step worked examples with numbers and conclusions
- 25 NABCEP-style practice quiz questions with explanations and NEC citations
- 3 inspection checklists with 16+ checkpoints each (pre-install, mid-install, final)
- 4 quick reference tables: standard breaker sizes, copper ampacity, aluminum ampacity, and conductor resistance
- 13 code-change entries between NEC 2017, 2020, and 2023 for solar-related sections

# 5 in-app calculators

- Cold-Temperature Voc (NEC 690.7) — adjusts module Voc and reports max modules per string
- PV Source Circuit Current (NEC 690.8 and 690.9) — applies the 1.25 x 1.25 factor for conductor and OCPD sizing
- Voltage Drop — AC single phase, AC three phase, and DC; copper or aluminum; AWG 14 to 4/0
- Conduit Fill — EMT, RMC, and PVC Schedule 40; THWN-2, XHHW-2, and PV Wire; warns on > 40 percent fill
- Breaker Size — picks the next standard NEC 240.6 rating

# Designed for

- Solar PV installers and electricians
- Electrical engineers and PV designers
- Building inspectors and plan reviewers
- Apprentices and NABCEP candidates in study

# Important

All content is paraphrased educational summary. The app is not a substitute for the official NEC or any certification exam materials. Always consult the latest published NEC and the local Authority Having Jurisdiction for legal requirements.

# Optional Pro upgrade — $2.99 one-time

The following items require a separate one-time in-app purchase. They are not required to use any of the calculators or content:

- Unlimited article views, no daily limit
- Dark theme
- Ad-free experience

Contact: [e-mail]

What’s new

v1.1.0
- 60 NEC section summaries (Articles 690, 691, 705, 706, 710)
- 31 NEC term definitions with cross-links
- 10 step-by-step worked examples
- 25 NABCEP-style practice quiz questions
- 3 inspection checklists (pre, mid, final)
- 4 reference tables (breakers, ampacity, resistance)
- 13 code-change entries (NEC 2017, 2020, 2023)
- 5 in-app calculators (Voc, PV current, voltage drop, conduit fill, breaker size)
- New bottom navigation: Browse, Tools, Study, Settings