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  • ⚡ Code Corner: 🔸 NEC 600.5(A) – Branch Circuits for Signs

⚡ Code Corner: 🔸 NEC 600.5(A) – Branch Circuits for Signs

Sharpen your knowledge with a quick dive into the NEC.

Author

Chris Martinez
June 22, 2025

📘 What NEC 600.5(A) – Branch Circuits for Signs:

What it says:
NEC 600.5(A) states that each electric sign or outline lighting system must be supplied by a dedicated branch circuit, and there must be a disconnecting means within sight of the sign or accessible to authorized personnel.

Why it matters:
Signs often operate on timers or photocells and may be mounted in hard-to-reach areas. A dedicated circuit prevents overloads from other equipment, and the local disconnect provides a safe way to perform maintenance or shut the sign off in emergencies — especially in commercial settings where signage is often serviced while energized.

💡Pro tip: Plan for signage early in the project. NEC 600.5(A) requires a dedicated circuit, so don’t let the sign be an afterthought. Running the circuit during rough-in avoids costly surface-mounted conduit later — especially on finished facades or storefronts where aesthetics matter.

Also: Label the circuit clearly in the panel. Sign contractors often come in late, and clear labeling helps everyone avoid guesswork (and phone calls)..

❓ Quick Code Quiz

Choose the correct answer:

❓ Question: You're wiring a new wall-mounted electric sign for a retail store. According to NEC 600.5(A), how must the sign be supplied?


A. The sign must be hardwired only — cord-and-plug connection is not permitted
B. It must have a dedicated circuit and be controlled by a switch located within sight
C. The sign must be connected to the nearest general-purpose lighting circuit
D. It can share a circuit with outdoor lighting as long as it’s less than 20 amps

Answer below 👇

🧠 Think it through:

NEC 600.5(A) requires that each sign and outline lighting system be supplied by a dedicated branch circuit. Additionally, the code mandates a disconnecting means within sight of the sign, and cord-and-plug connections are allowed under specific conditions (see 600.10).

✅ Answer: B) It must have a dedicated circuit and be controlled by a switch located within sight

📘 Reference:
📘 National Electrical Code (NEC) 2020, Article 600 – Electric Signs and Outline Lighting

  • NEC 600.5(A) – Branch Circuit Required - "Each commercial occupancy accessible to pedestrians shall have at least one outlet installed at each entrance to each tenant space for a sign or outline lighting system. The outlet(s) shall be supplied by a branch circuit rated at least 20 amperes that supplies no other loads."

  • NEC 600.6(A)(1) – Disconnect Required - "Each sign and outline lighting system, or section thereof, shall be controlled by an externally operable switch or circuit breaker that opens all ungrounded conductors and is located within sight of the sign."

  • NEC 600.10 – Portable Signs - Allows cord-and-plug connections only for portable or mobile signs, not for fixed wall-mounted signs.