Quick Hits

Episode 4: Connections, Warning Signage & Disconnecting Means (426.78 – 426.91)

SLIDE 1 (HOOK / COVER)

⚡ NEC Quick Hit: Connections, Signage & Disconnects (Part 4) ⚡

Exothermic welding, metal penetration warning signs, lockable simultaneous disconnects, and controller switching rules—let's finish Article 426! 👇

SLIDE 2 (CONNECTIONS & MANDATORY SIGNAGE)

Secure Terminations and Safety Warnings:

• Electrode Connections: Electrical connections within conductive pavement must use exothermic welding or listed irreversible crimp-type terminals installed with stainless steel hardware.

• Warning Signage: Systems must feature permanent warning signs stating: "WARNING - RISK OF FIRE AND/OR ELECTRIC SHOCK. Conductive pavement installed. Do not penetrate pavement with any metal components.".

SLIDE 3 (DISCONNECTING MEANS & CONTROLLERS)

Simultaneous Disconnection:

• Disconnect Requirements: All fixed outdoor deicing and snow-melting equipment must be provided with a means for simultaneous disconnection from all ungrounded conductors.

• Indicating & Lockable: The disconnecting means must be of the indicating type and be lockable open in accordance with Section 110.25.

SLIDE 4 (WRAP-UP) 💡 Apprentice Pro-Tip: 

Never skip posting the mandatory "Do not penetrate pavement with any metal components" warning signs on conductive pavement installations—those signs protect future maintenance crews from fatal electric shock!

💬 Save this post for your final code review on Outdoor Deicing and Snow-Melting Equipment!

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