The Dangers of Knob and Tube Wiring in Older Homes
By Jesse and Alyshia Camp, JCamp Electric
Published In Northampton Living | February 2026
Knob and tube wiring, commonly found in homes built before the 1950s, poses significant safety risks – especially when paired with modern high-demand appliances like space heaters. This early wiring system used individual conductors supported by ceramic knobs, with rubber insulation around the wires. Over time, that rubber can dry-rot, crack and fall apart, leaving bare conductors exposed. When this happens inside walls or attics filled with insulation or debris, the risk of electrical arcing and fire increases dramatically.
Jesse Camp
Electricians
Alyshia & Jesse Camp
JCamp Electric
413-268-4224
jcampelectric.com
info@jcampelectric.com
One of the biggest dangers occurs when homeowners plug in space heaters. These heaters draw a high amount of current, often more than old circuits were ever designed to handle. A weakened knob and tube system can overheat quickly, trip fuses repeatedly, or fail entirely – potentially igniting surrounding materials.
In contrast, BX cable (also known as armored cable) is a more recent improvement that encloses wires in a flexible metal sheath. This metal armor provides mechanical protection and helps contain heat, making BX far safer than exposed knob and tube conductors. However, even BX has limitations if it’s outdated, improperly grounded or deteriorated.
For anyone living in an older home, having a licensed electrician inspect the wiring is essential. Replacing failing knob and tube with modern, code-compliant wiring greatly reduces fire hazards and ensures your electrical system can safely support today’s appliances. JCamp Electric is here to keep you safe and warm for the rest of the winter. Give us a call today.
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