Quick Hits

Episode 3: Placards, Warnings & Power Inlets (702.7 & 702.12)

SLIDE 1 (HOOK / COVER) ⚡ NEC Quick Hit: Warning Signs & Power Inlets (Part 3 - Article 702) ⚡ 

Clear labeling keeps lineworkers and service personnel safe. What warning signs and inlet rules does Article 702 mandate for optional standby systems? Let's break it down! 👇

SLIDE 2 (MANDATORY PLACARDS & GROUNDING WARNINGS) Signage Requirements:

• Dwelling Units: Permanent placards or directories must be installed at the service disconnecting means indicating the location of the optional standby source disconnect or prime mover shutdown.

• Grounding Warning: If removing a normal grounding connection breaks the alternate source's grounded conductor path, a warning sign must warn of shock hazards if the alternate source is energized.

SLIDE 3 (PORTABLE GENERATOR INLET LABELS) Power Inlet Warning Labels:

• Where a power inlet is used for a portable generator, a warning sign must indicate whether the system is wired as a separately derived (bonded neutral) or nonseparately derived (floating neutral) system.

• Power inlets rated at 100A or greater require an interlocked disconnecting means to prevent hot unplugging under load.

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

Pay close attention to generator inlet wiring! Mismatching a bonded-neutral portable generator with a floating-neutral transfer setup (or vice versa) creates dangerous ground loops and neutral-to-ground faults. Always read the inlet warning label!

💬 Save this post for your next generator inlet rough-in! 🔗 

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