Quick Hits

🎬 NEC 2026 ARTICLE 120 SERIES
PART 7 OF 30 — NEC 120.7(C)(1)(2) | PCS MONITORS CONTROLLED + NONCONTROLLED LOADS

NEC 120.7(C)(1)(2) EXPLAINED ⚡
WHEN A PCS MONITORS EVERYTHING
joshthesparky4 · Josh The Sparky

⚡ OPENING HOOK

When a PCS monitors everything...

The calculation method changes again. ⚠️

🧠 CORE IDEA

⚡ Some Power Control Systems don’t just monitor controlled loads.

They monitor:

🟢 Controlled Loads
🔵 Noncontrolled Loads

When a PCS is watching the entire system, the NEC does NOT allow the same simplification used in controlled-only systems.

⚡ CODE CONNECTION

When a PCS monitors BOTH controlled and non-controlled loads:

❌ You do NOT use the PCS control setting

Instead:

⚡ The controlled loads are calculated using their MINIMUM OPERATING CURRENT

⚡ Noncontrolled loads are still calculated using standard NEC Article 120 methods

This ensures the calculation reflects real operating conditions while still protecting system limits.

🧠 WHY THIS MATTERS

Because the PCS is monitoring the entire system—not just selected loads—the NEC requires a more conservative approach.

The system is still controlled...

But not simplified.

📌 CORE TAKEAWAY

⚡ Controlled-only PCS → use control setting
⚡ Full-system PCS → use minimum operating current

⚡ Noncontrolled loads are always calculated normally

⚡ FINAL LINE

The more the system watches...

The less you can simplify the math. ⚡

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