⚡ Trade Discussion of the Day / Answer Revealed — Listed vs. Labeled ⚡ ✅ Correct Answer: B. A nameplate or product sticker alone does not establish that equipment is listed. LISTED: The equipment appears in a published list from a product-evaluation organization acceptable to the authority having jurisdiction—the AHJ. The listing establishes that it meets designated standards or has been evaluated for a specified purpose. The organization also maintains ongoing production oversight. LABELED: The equipment carries that type of organization’s identifying label, symbol, or mark. Under its program of periodic production inspections, the mark indicates compliance with appropriate standards or specified performance. 📘 Code reference: NEC Article 100 — “Listed” and “Labeled.” 💡 Think of it this way: Listed = the certification record. Labeled = the identifying mark attached to the equipment. These often go together. But a manufacturer’s sticker showing 120 volts, 15 amps, or a model number is not, by itself, a certification mark. 🔎 What should you check? Look for the certification organization’s mark, verify the exact product in its certification directory, and confirm what use the certification covers. A sticker provides information. A certification mark has an evaluation program behind it.

⚡ Trade Question of the Day / Answer Revealed — The Meter Reads Zero… Is the Circuit Dead? ⚡ ✅ Correct Answer: A. Approximately 0 volts. You got it, Reed! Thanks for jumping in. 👍 With the switch closed and functioning properly, its contacts provide a very low-resistance path. Both sides are at nearly the same electrical potential, so a voltmeter connected across the switch reads approximately 0 volts. The lamp still has approximately 24 volts across it, and current continues flowing through the circuit. 🔎 Does that zero reading alone mean the circuit is de-energized? Absolutely not. A voltmeter measures the difference in electrical pressure between its two leads. Two points can have essentially no difference between them while both are energized relative to another reference point. 💡 The takeaway: Where you place your meter leads matters just as much as the number on the display. Zero volts across a closed switch does not prove the circuit is dead.

@Tara Johnston Welcome to The Junction Box, Tara! ⚡ Great to have another Northern Californian here! Running a contracting business takes teamwork, and learning more about the work in the field can make that partnership even stronger. My wife, Lisa, is part of this community too, so it’s great to see other husband-and-wife teams here. You don’t have to be an electrician to belong here. Ask questions, join the conversations, and share your perspective on the business side—we can all learn from each other. Glad you joined us!

@Reed Gary Welcome Reed. Thanks for joining the group. 👍