Quick Hits

Episode 3: Surface Markings & Industrial Applications (722.100 – 722.121)

SLIDE 1 (HOOK / COVER) ⚡ NEC Quick Hit: Cable Markings & Industrial Rules (Part 3) ⚡

What do codes like CL3P, OFNP, and FPLP actually mean? How do surface markings protect installers? Let's decode Article 722 cable markings! 👇

SLIDE 2 (DECODING CABLE MARKINGS) Mandatory Surface Markings:

• Fire Rating Hierarchy: Cables must display their type designation descending by fire resistance (e.g., Plenum P, Riser R, General Purpose, and Limited Use X).

• The Voltage Marking Ban: Voltage ratings shall not be marked on limited-energy cables (unless dual-listed). Why? To prevent anyone from accidentally mistaking low-voltage data wire for 600V Class 1 power!

SLIDE 3 (INDUSTRIAL PLTC-ER CABLES) Exposed Runs in Industrial Settings:

• Under Section 722.121, in supervised industrial establishments where only qualified persons service the installation, Type PLTC-ER cable is permitted to be exposed between cable trays and utilization equipment if continuously supported and protected against physical damage.

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

Look for optional surface markings like ST1 for limited smoke or HF for halogen-free when pulling cables through high-occupancy or sensitive environmental spaces!

💬 Save this post for your next material staging and inspection check! 🔗

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

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