Home wiring has gotten complicated with all the different standards, materials, and opinions flying around. As someone who’s worked with electrical systems in homes ranging from 1920s Seattle bungalows to new construction, I learned everything there is to know about what keeps residential wiring safe and functional. Today, I’ll share it all with you.
The Basics Every Homeowner Should Understand
Probably should have led with this section, honestly — knowing your home’s wiring isn’t just for electricians. Your electrical system has a service entrance, a main panel with breakers, branch circuits running throughout the house, and receptacles and fixtures at the endpoints.
Each component can fail or become outdated. Understanding what’s in your walls helps you make informed decisions about maintenance, upgrades, and when to call a professional.
Old Wiring Types and Their Risks
That’s what makes older Northwest homes endearing but also concerning to us electricians — many still have original wiring. Knob and tube wiring from pre-1950 works fine when undisturbed, but adding insulation around it creates fire risk. Aluminum wiring from the 1960s-70s requires special handling at connections to prevent overheating.
Neither type automatically needs immediate replacement, but both require assessment by someone who understands their specific risks.
Modern Standards and Code Requirements
Current electrical code requires AFCI protection for bedrooms and living areas, GFCI protection near water, tamper-resistant outlets throughout, and larger gauge wiring for modern electrical loads. Homes built decades ago don’t automatically violate code — but updates may be required during renovations.
When to Upgrade
Flickering lights, warm outlets, frequently tripped breakers, and two-prong outlets throughout the house all signal wiring that may need attention. Get an assessment before problems become emergencies.
