Every hazardous panel type has a real, documented story behind it: a design decision, a cost shortcut, a testing result, a code change. These guides go deeper than a warning label so you can understand exactly what you're dealing with.
The History of Split-Bus Panels
Where the "six disconnect rule" came from, why it was a cost shortcut, and the real reason the 2020 NEC closed the loophole.
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Zinsco Panels: What Actually Goes Wrong
The aluminum bus bar flaw that welds breakers into the "on" position, who actually determined these panels are risky, and a real recall that's often confused with them.
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Federal Pacific Stab-Lok: The Full Story
The CPSC investigation, the independent testing, the court findings, and why these panels were never actually recalled.
Read the guide →The Open Neutral: A Dangerous Fault
When a split-phase system loses its neutral, the two 120V legs stop acting independently and start fighting each other for voltage, while nothing looks obviously wrong.
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Knob-and-Tube: When It's Actually Dangerous
What knob-and-tube wiring is, how it evolved into modern Romex, and the specific conditions, like insulation buried on top of it, that turn it from old into hazardous.
Read the guide →Hot Tub & Spa Electrical Clearances
The distances a hot tub install has to meet: no receptacles within 6 ft, switches and disconnect 5 ft away, GFCI, #8 copper bonding, and 22.5 ft below overhead lines.
Read the guide →Panels are only part of the story. These guides step back to explain the physics and the history behind the power running through them, from how a generator works to the rivalry that decided which kind of current would run the modern grid.
What Is Electricity, Really?
Why electrons vibrate instead of flowing, why a motor and a generator are the same machine, and how Tesla turned that principle into the modern power grid. With animated diagrams.
Read the guide →Why North America Runs 120/240V
Where the 120-volt standard came from, how one transformer delivers two voltages to the same house, and why the whole country never switched to 230V.
Read the guide →What Is a Transformer?
How two coils that never touch can move electricity between them, and why the whole trick only works with AC.
Read the guide →The War of the Currents: Why AC Won
Edison backed DC, Westinghouse and Tesla backed AC, and the fight got genuinely ugly. What actually happened, and what the popular version gets wrong.
Read the guide →Who Brought Us Electricity: A Who's Who
Short profiles of the scientists and businesspeople behind the grid, the famous names and the ones who deserve to be.
Meet them →Hands-on explainers with animated diagrams you can click. Flip a switch and watch the live wires light up, or tap any part of a panel to see what it does.
How Light Switches Work
Build it up from a single-pole switch to a 3-way, then drop a 4-way in the middle. Flip them and watch the live path light up. Plus real NM-B wiring, the California/coast method, and the neutral-in-box code rule.
Open the animation →Anatomy of an Electrical Panel
Click any part of the panel, main breaker, bus bars, neutral and ground bars, bonding jumper, to see what it does.
Explore the panel →The apprenticeship standards, safety training, and working conditions this trade runs on today didn't happen automatically. They were organized for, decade by decade, and it's part of our history worth knowing.