Quick Hits

Episode 2: System Listing & Dependent Active Devices (726.2)

SLIDE 1 (HOOK / COVER) ⚡ NEC Quick Hit: Class 4 Listing Requirements (Part 2 - Article 726) ⚡

Can you mix and match any Class 4 transmitter and receiver on a job site? Section 726.2 outlines strict listing and interoperability rules. Let's check out the gear requirements! 👇

SLIDE 2 (MANDATORY LISTING STANDARDS)

What Must Be Listed?

• Transmitters & Receivers: Power sources must be listed as Class 4 transmitters (evaluated under standards like UL 1400-1).

• Terminals & Hardware: All distribution terminals, active components, and connecting hardware used in Class 4 systems shall be listed.

SLIDE 3 (DEPENDENT ACTIVE DEVICES & INTEROPERABILITY)

Specific System Pairings:

• Interoperability Marking: Listing info must specify compatible devices if an active component relies on specific receivers or controllers for fault monitoring and current control.

• Why? If a transmitter relies on a specific receiver's feedback loop to detect human contact, pairing it with an incompatible device defeats the safety system!

SLIDE 4 (WRAP-UP)

💡 Apprentice Pro-Tip: Always check the manufacturer's compatibility list before staging Class 4 transmitters and receivers. Mixing brands or unlisted hardware will immediately fail your inspection!

💬 Save this post for your next smart building material order! 🔗 

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