Quick Hits

Episode 4: Secondary Circuits, Grounding & Branch Circuits (411.7 – 411.8)

SLIDE 1 (HOOK / COVER)

⚡ NEC Quick Hit: Secondary Circuits & Bare Conductors (Part 4) ⚡

Secondary grounding bans, 7-foot bare conductor heights, and 20-amp branch circuit limits—let's finish Article 411! 👇

SLIDE 2 (SECONDARY CIRCUITS & BARE CONDUCTORS)

Isolating and Grounding Rules:

• Grounding Prohibition: Secondary circuits shall not be grounded (unless supplied by a Class 2 power source specifically listed and identified as suitable for secondary grounding).

• Isolation: Secondary circuits must be insulated from the branch circuit by an isolating transformer.

• Bare Conductors: Exposed bare conductors (like trapeze lights) are permitted for indoor installations only, and must be installed at least 2.1 m (7 ft) above the floor unless specifically listed for a lower height.

SLIDE 3 (BRANCH CIRCUIT SUPPLY)

Feeding the Power Supply:

• Class 2 Supplies: Conductors and equipment supplying Class 2 power sources must comply with Section 725.127.

• Other Power Sources: Non-Class 2 power sources must be supplied from a maximum 20-ampere branch circuit.

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

When installing exposed low-voltage cable systems like cable lights or rail lights indoors, make sure they sit at least 7 feet off the finished floor unless the system listing specifically allows a lower mounting height!

💬 Save this post for your final code review on Low-Voltage Lighting Systems!

🔗 More code breakdowns and study tools at www.JoshTheSparky.com

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