Control Devices and Disconnecting Means
Where Every Disconnect Goes and How It Is Rated
NFPA 70 National Electrical Code, 2023 edition · Reviewed 2026-09-21
This is a synthesis area — the Florida exams pull disconnect questions from Articles 110, 225, 230, 404, 422, 424, 430, 440, 445 and 450. This lesson collects every disconnect rule in one place and adds the control-circuit rules that ride with them. All numbers are cross-referenced to the lessons where the primary text was read. Written from the 2023 text.
1. Two definitions the whole area depends on
- In Sight From / Within Sight (110.29 — moved out of Article 100 in 2023): visible and not more than 50 ft (15 m) from the other equipment.
- Lockable open (110.25): where the Code requires a disconnect to be lockable in the open position, the provisions for locking remain in place with or without the lock installed (portable means such as a lock-off clip that stays on the breaker qualify; a cord-and-plug connection is the one exception). Most "within sight" rules have an exception that accepts a lockable disconnect instead — but not 440.14 for HVAC in general occupancies and not 430.102(A) for controllers.
Preview
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