Vintage Thomas Porcelain Cable Insulator

Description :
This is a vintage brown-glazed porcelain cable insulator, embossed with the “THOMAS” maker’s mark. Manufactured by Thomas, a well-known American producer of high-voltage insulators, this type was typically used for electrical distribution lines or substation equipment. The rich mottled brown glaze not only offered weather protection but also reduced dust accumulation on the surface. The bottom features a threaded mounting hole and a glazed skirt to improve insulation performance in outdoor settings. Today, these pieces are prized by collectors of industrial artifacts and can also be repurposed for creative decor projects.

Era
Mid-20th century

Style
Industrial Utility

Technique
High-voltage porcelain casting with brown mottled glaze firing

Tools Used
Slip casting molds, high-temperature kiln, glazing equipment

History
Thomas produced heavy-duty porcelain insulators for electrical infrastructure across the U.S. from the early 1900s onward, known for their durability and distinctive brown glaze.

Manufacturer / Maker
Thomas (Thomas Electric Porcelain Co., later Thomas & Betts)

Suggested Weight
~1.5–2 lbs

Item Number : P14225

Category : Electrical

Brand : Thomas (Thomas Electric Porcelain Co., later Thomas & Betts)