Trinity-Bellwoods Knob & Tube Rewiring: Ensuring Your Home’s Electrical Safety

Understanding Knob & Tube Wiring

Knob & tube wiring, also known as K&T wiring, was a common electrical installation method used from the late 19th century until the mid-20th century. It consists of two insulated copper wires (the “knobs”) wrapped around porcelain or clay insulators to support them, with occasional metal tubes or “knob” supports to keep the wires secure. The original purpose of this wiring was for lighting and low-power applications.

Identifying Knob & Tube Wiring in Your Home

In homes built between 1880 and 1940, K&T wiring is a likely discovery. These types of homes often feature:

A mix of two-wire and three-wire circuits
No grounding system (bare or uninsulated neutral wire)
Unprotected switches and outlets
Visible knob & tube wiring throughout the home

Risks Associated with Knob & Tube Wiring

Using a K&T electrical installation poses several risks:

Fire hazard: The lack of grounding and insulation can cause sparks, igniting flammable materials.
Electrical shock: Unprotected switches and outlets increase the risk of electric shock.
Reduced power capacity: K&T wiring typically has limited amperage, making it difficult to support modern electrical demands.