These are pictures I took from our room during our recent Hawaii visit — daytime, nighttime, and even a thermal view. The pool was drained and crews were working below. I'm always looking for trade or code related question even while on vacation. 🌴 Under 2023 NEC 680.26, what is the main purpose of equipotential bonding around a swimming pool? A. Make the pool equipment use less electricity B. Reduce voltage differences between conductive parts and surfaces in the pool area C. Replace the need for GFCI protection D. Send all electricity directly into the earth Scroll down for the answer. 👇 👇 👇 👇 👇 👇 👇 👇 👇 👇 👇 👇 👇 👇 👇 👇 👇 👇 Answer: B. Reduce voltage differences between conductive parts and surfaces in the pool area Here’s why: Voltage is a difference in electrical potential. If someone contacts two surfaces at different potentials, current can flow through their body. Equipotential bonding connects the required conductive parts together to reduce those differences—and help reduce shock risk. Think about someone standing barefoot on a wet pool deck while grabbing a metal handrail. The voltage difference between those contact points matters. Why the other answers are incorrect: • A: Bonding is a safety measure, not an energy-saving feature. • C: Bonding and GFCI protection perform different jobs. One does not replace the other. • D: The purpose is to reduce voltage differences around the pool—not simply send electricity into the dirt. Code reference: NEC 680.26 — Equipotential Bonding. A lot of the electrical safety work around a beautiful pool is hidden beneath the finished surfaces. Discussion: If a pool had no electrically powered lights or pump, would equipotential bonding still matter? Explain your thinking.

A circuit has a 10Ω resistor in series with two 20Ω resistors connected in parallel. What is the circuit’s total resistance? - A. 10Ω - B. 20Ω - C. 30Ω - D. 50Ω Scroll down for the answer. . . . . . . . . . . . . . . . . . Answer: B. 20Ω First, solve the two equal parallel resistors: 20Ω ÷ 2 = 10Ω Then add that equivalent resistance to the series resistor: 10Ω + 10Ω = 20Ω total resistance If this circuit were connected to 120 volts, the total current would be: I = E ÷ R = 120V ÷ 20Ω = 6A Discussion question: Why must you simplify the parallel section before adding the series resistance?

You have a 20 amp branch circuit feeding a load that will run continuously for 3 hours or more. What is the maximum continuous load you should place on that 20 amp circuit? A. 12 amps B. 16 amps C. 20 amps D. 25 amps Here’s the important part: continuous loads are not treated the same as short-term loads. If a load is expected to run for 3 hours or more, the circuit has to be sized so it is not loaded beyond 80% of the breaker rating. Scroll down to see the answer. Click see more. So for a 20 amp circuit: 20 amps x 0.80 = 16 amps That means the correct answer is B. 16 amps. This is one of those details that shows up on code tests, apprenticeship tests, journeyman tests, and in real-world design. The math is simple, but missing the word “continuous” changes the answer. Drop a comment: Have you ever missed a test question because of one word in the problem?

I spotted this armored cable installation at a local public building. Take a close look at the routing, support, ventilation opening, and the bend above the doorway. What problems do you see—and how would you have installed it differently? Drop your observations in the comments before looking too closely at the callouts.

Welcome to our new members. Glad to have you inside The Junction Box. Quick update on the Thermal Imaging course: the first three lessons are already done and posted: - What This Course Is and Isn’t - How a Thermal Camera Actually Works - Red Doesn’t Mean Fire: Reading the Thermal Color Scale I’m currently working on the next section, which is the Cup Test Lab. The goal is to have that lab finished and posted sometime Sunday or Monday this week. I’ve also been building and editing the videos that will be embedded throughout the course. If you want a sneak peek at the kind of demonstrations coming into the program, you can check out the YouTube channel here: https://www.youtube.com/channel/UC8YjTaytUYEN3sVZORh4RfA Quick question for everyone: Have you ever used a thermal camera before? Yes or no? Drop your answer in the comments. This is also a good way to start engaging in the community and building points toward unlocking future content. Welcome again to the new members.