Quick Hits

Episode 3: Class 4 Loads & Separately Derived Systems (726.122)

SLIDE 1 (HOOK / COVER) ⚡ NEC Quick Hit: Class 4 Loads & Receivers (Part 3 - Article 726) ⚡ 

What happens on the output side of a Class 4 power receiver? Does it count as a separately derived system? Section 726.122 defines output circuit rules. Let's break down the math! 👇

SLIDE 2 (RECEIVER OUTPUTS AS SEPARATELY DERIVED SYSTEMS)

Feeding Branch Circuits & Feeders:

• Separately Derived System: Outputs of a Class 4 receiver and power outputs of utilization equipment shall be considered a separately derived system if used as a supply for a feeder or branch circuit.

• Standard Rule Application: Grounding and bonding requirements for separately derived systems kick in for those output circuits.

SLIDE 3 (THE LIMITED-POWER EXCEPTION)

Feeding Class 2 / Class 3 Loads:

• Article 725 Exception: If a Class 4 receiver converts energy down to supply limited-power circuit outputs (like Class 2 or 3 loads), it is permitted to meet Part II of Article 725 instead!

SLIDE 4 (WRAP-UP)

💡 Apprentice Pro-Tip: Class 4 receivers act as power transformers or converters—taking high-voltage FMPS input and stepping it down or outputting standard branch circuits. Always identify where your SDS boundary starts!

💬 Save this post for your next Class 4 receiver wiring review! 🔗 

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