Skip to main content

Better Safe Than Sorry

In this episode - Better Safe Than Sorry . . .

Can you identify the device in the photo? Here's a clue: it's the size of your thumbnail and functions as a safety device that shields an electrical circuit from excessive current flow. Often found in modern-day furnaces, this device is a 3-amp fuse. Fuses are essential components in electrical systems to protect equipment and wiring from overcurrent conditions that can cause electrical fires or damage other electrical components.

We recently had our home repainted and had to remove all the light fixtures, electrical outlet covers, heater grates, and the thermostat that manages our HVAC system. An electrician advised me that it's important to unplug your furnace from its electrical outlet, cover exposed wires with electrical tape or wire nuts, or shut down the power from the circuit breaker panel box before starting any electrical work. Why? Because the thermostat, connected to the furnace, is powered by a DC transformer that is commonly damaged if not protected by a fuse. The "3" on this fuse indicates its current rating. This means the fuse will allow up to three amperes (or three amps) of electrical current to flow without blowing or "tripping" a circuit. If the current exceeds three amps due to a short circuit (wires touching) or some other fault in the circuit, the fuse will heat up and melt, breaking the circuit and cutting off the flow of electricity. This action protects the connected devices and prevents potential damage or fire.

Fuses are available in various sizes and current ratings, the appropriate rating depends on the specific electrical circuit and the devices connected. Using a fuse with too high a current rating for a circuit can lead to inadequate protection while using one with too low a rating can result in frequent, unnecessary fuse blows. Selecting the right fuse for a given application is essential to ensure safety and proper circuit protection.

A qualified electrician would easily recognize this particular fuse. However, you might need help to identify this one if you have never seen the various shapes, sizes, and capabilities of different fuses. 

Historically, (1950s & 60s) fuse panels had round fuses roughly the size of a quarter. They had a glass window that allowed you to see if the fuse was blown and the connection severed. In the movie Christmas Vacation, a modern breaker box with built-in circuit breakers acted as fuses to protect the circuits.

Also, if you have ever browsed Home Depot's electrical department, you may have seen fuses that looked like large lipstick tubes with copper ends.

Once the painting project was finished we reconnected the Nest Thermostat to its backplate, an error message appeared, "No power to the unit." We tested the power wire using an AC voltage meter, but that didn't work. You see, the thermostat operates from a DC transformer, which can easily burn out without proper protection from a fuse. Your doorbell may also use a DC transformer - on a different circuit.

When asked to check if the furnace fuse was blown, I realized I had no idea what to look for. If you are facing a similar problem, check the fuse first. Remember, electricity can be dangerous, and it's always best to call a qualified electrician if you have any doubts.

My friends, it's better to be safe than sorry.

I'm Patrick Ball; thanks for listening. See you in the next episode.

Labels:

Comments

Post a Comment

Most Popular of All Time

Resurrecting the '90s Graphite

Let’s face it, there’s a certain danger in reading John Gierach's Trout Bum . His wit, self-deprecation, and sharp, effortless satire are entirely infectious. If you aren't careful, his words will inspire you to drop everything, wade into a freezing river, and try to outsmart a creature with a brain the size of a lentil. In my case, re-reading Gierach recently didn't send me straight to the river. It sent me digging through the dusty, spider-guarded corners of my garage. In the early 1990s, seeking a natural escape from Manhattan's concrete canyons, I decided to learn to cast a fly rod. I bought an Orvis Rocky Mountain —eight-and-a-half feet, three ounces, built for a five-weight line—and had absolutely no idea how to use it. To avoid aimlessly whipping the water like scrambling eggs, I took fly-fishing lessons from Al Cucci, co-author of Hatches , on the Delaware River. With his guidance, I fished renowned waters: the AuSable in New York and Michigan, and New Jersey...
Post a Comment
Read more

A B+ Kind of Life

Welcome back to this week's On the Fly . Retirement has taught me something unexpected: life gets a lot more enjoyable when you stop chasing perfection. Lately, I've been having an absolute blast playing executive par-3 courses like Rancho Carlsbad . A short iron, a sunny morning, and nowhere to be except the next tee—that's my kind of day. This Thursday, though, I'm raising the stakes. I'm heading to The Links at Lakehouse in San Marcos, a full-size par-71 course with enough water hazards to keep the local fish well-stocked with my golf balls. After shooting a 64 on a par-3 course, I've set myself a new goal: shoot an 89 before my birthday next August. Why 89? Because on a par-71 course, that's bogey golf—one extra stroke per hole. For non-golfers, think of it this way: par is like earning 100% on a final exam. Bogey golf is a solid B+. You got the job done, learned something, and probably had a lot more fun getting there. The older I get, the more I appre...
Post a Comment
Read more

From Mailbox to Microphone

In this episode, catching up with Sierra . What happens when you combine a little imagination, modern digital tools, and the willingness to make a glorious, muddy mess? You get our guest’s latest project. I’m Patrick Ball. Welcome back to On the Fly . Today, we are diving into the world of native plants and guerrilla gardening with twelve-year-old creator Sierra. After watching her impressive, self-produced tutorial on how to make ‘Seed Balls,’ I had to know how she did it. It’s incredibly inspiring to watch Sierra evolve from a young artist wielding crayons and stationery into a savvy digital creator. She’s writing scripts, mastering voiceovers, and editing—all to make a positive, green impact on her local community. “She shoots, she scores, and she’s here to tell us all about it.” Please welcome Sierra to On the Fly ! Let’s get into it. Audio interview . . . For more blog posts showcasing Sierra’s talents, see: The Mailbox Surprise . . . and The Summer Surprise I’m Patrick Ball. Sta...
Post a Comment
Read more

The AI Debate Was Settled in 1954

In this episode, what a 70-year-old sci-fi mystery teaches us. Welcome back to On the Fly. I’ve been looking for a clear way to explain how we should be handling Artificial Intelligence today. I finally found the answer hidden in a book I just finished. The twist? It was written more than seventy years ago. Isaac Asimov's The Caves of Steel was published in 1954, when a computer filled an entire room, consumed enough electricity to dim the neighborhood, and had roughly the computing power of today's microwave. Yet Asimov set his story nearly 3,000 years in the future—a world where humanity lives in sprawling enclosed cities (New York) and depends on advanced technology for nearly every aspect of daily life. The remarkable part isn't how much of the technology he imagined. It's how accurately he predicted us. In Asimov's future, society struggles with the introduction of highly sophisticated humanoid robots powered by "positronic brains." Naturally, a lou...
Post a Comment
Read more