Quick Hits

Episode 2: Paralleling Restrictions & Mandatory Labeling (721.30(B) – (C))

SLIDE 1 (HOOK / COVER) ⚡ NEC Quick Hit: Class 2 & 3 Labeling & Paralleling (Part 2 - Article 721) ⚡

Can you tie multiple low-voltage power supplies together to increase output? What information must be stamped on your PoE switches? Let's check out Section 721.30! 👇

SLIDE 2 (THE PARALLELING BAN) Output Interconnection Rules:

• No Unauthorized Paralleling: Class 2 or Class 3 power source output connections shall not have their outputs paralleled or otherwise interconnected unless the equipment is explicitly listed for such interconnection.

SLIDE 3 (MANDATORY NAMEPLATE & OUTPUT LABELING) What Must Be Marked on the Gear?

• Durably Marked: Power supply equipment must clearly identify each Class 2 or Class 3 circuit.

• Electrical Ratings: Limited power sources, IT, A/V, and communications power sources must feature a label indicating the maximum voltage and rated current output per conductor for each connection point (e.g., 52V @ 0.433A, 57V MAX for PoE systems).

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

Clear labeling on low-voltage power sources and PoE switches prevents accidental overloading and speeds up troubleshooting during service calls and AHJ inspections. Never peel off those manufacturer specs!

💬 Save this post for your next data closet or low-voltage audit! 🔗

More code breakdowns at www.JoshTheSparky.com

← View Chapter 7 Home

← Back To Article 720 Home

← Back To Quick Hits Home