Rewiring a home can seem like a daunting task, but with some simple historical wiring methods, it is entirely possible to do it safely without risking electrocution. In this article, I will walk you through the step-by-step process I followed to rewire my 100 year old home using techniques from the early 20th century.

Understanding Historical Wiring Methods

Before attempting to rewire a home, it is crucial to understand the wiring methods used in the past.

Knob and Tube Wiring

The earliest electrical systems used knob and tube wiring. This involved running wires through ceramic knobs tacked to walls and ceilings, with air gaps between wires. This method provided insulation and cooling.

Armored Cable (BX)

In the 1920s, armored cable, also known as BX wiring, became popular. This uses metal sheathed cables instead of bare wires. The metal sheathing acts as a ground wire.

Electrical Conduit

By the 1930s, most wiring used electrical conduit - metal or plastic tubing that houses wires. Conduit protects wires and provides flexibility in routing.

Creating a Rewiring Plan

With an understanding of historical wiring methods, I was ready to plan my rewiring project.

Circuit Mapping

First, I mapped out all the existing circuits in my home. This involved locating the main service panel, identifying each circuit by flipping breakers, and labeling lights and outlets corresponding to each circuit.

Load Calculations

Next, I did load calculations to determine the required capacity of the rewiring job. This included tallying the wattages of all lighting fixtures and appliances on each circuit.

Layout Planning

I drew up a floorplan showing proposed new circuit routes and locations of outlets and switches. For safety, circuits require GFCI protection near wet areas like kitchens and bathrooms.

Installing New Wiring

With my rewiring plan complete, I was ready to safely install the new wiring.

Turning Off Power

Safety first! I shut off power at the main breaker before touching any wiring. I also used a contactless voltage tester to doubly ensure power was off.

Running Cables

I drilled holes to route new cables between floors and through framing. I used metal clad cables for safety and flexibility. I stapled the cables to secure them neatly in place.

Outlets and Switches

I wired new outlets and light switches, being sure to match hot and neutral wires correctly. I used twist-on wire connectors to join wires securely.


Proper grounding is essential, so I made sure all new wires were properly grounded through attached metal boxes and conduit. I also added ground rods outside.

Testing Circuits

With the new wiring installed, I turned the power back on and tested every outlet and switch with a circuit tester. This ensured all wiring was safe and functional before reconnecting appliances.

Helpful Historical Rewiring Tips

Throughout my rewiring journey, I discovered some helpful tips:


While rewiring a home seems intimidating, it can be done safely using common sense precautions and simple, effective historical wiring techniques. Always turn power off, wear protective gear, follow codes, and test your work. With adequate planning and care, you can rewire your home without tragedy, just like the old days. My home now has a sparkling new electrical system providing safe, modern power throughout, thanks to the ingenious methods pioneered almost a century ago.