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⚡ Code Corner: Don’t Skip the Disconnect – NEC 422.31(B)

Sharpen your knowledge with a quick dive into the NEC.

Author

Chris Martinez
June 16, 2025

📘 What NEC 422.31(B) says:

What it says:
For permanently connected appliances over 1/8 horsepower, there must be a means to disconnect them from all ungrounded conductors. This disconnect must be within sight of the appliance or be lockable if located remotely.

Why it matters:
This protects personnel working on appliances by ensuring they can disconnect power safely. "Within sight" means visible and not more than 50 feet away, while a lockable disconnect allows flexibility without sacrificing safety.

💡 Pro Tip:
If your disconnect is in the panel across the room and out of sight, you must add a lockable breaker or a local disconnect to comply.

❓ Quick Code Quiz: Chapter 4 – Equipment for General Use

Choose the correct answer:

Question:
You’re installing a hardwired water heater rated at 2 HP. Which of the following is required?

A) A plug and cord connection
B) A disconnecting means within sight or lockable
C) No disconnect needed if the breaker is labeled
D) Only an equipment grounding conductor

Answer below 👇

🧠 Think It Through:
Imagine a tech working on a 1/2 HP motor under a sink while the breaker is across the house. Would they feel safe? Probably not—especially if someone else can flip the breaker back on. That’s why NEC insists on sight or lockability—it’s about protecting real people, not just checking boxes.

✅ Answer: B) A disconnecting means within sight or lockable

🔎 Code Reference:
NEC 422.31(B) – 2023 Edition

"A means shall be provided to disconnect appliances... The disconnecting means shall be within sight from the appliance or shall be capable of being locked in the open position."