What does PI stand for?

Paper Insulated

This definition appears very rarely and is found in the following Acronym Finder categories:

Science, medicine, engineering, etc.

Other Resources:

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Samples in periodicals archive:

Asbestos cement was used for roofing and wall-cladding, ducts and soffits were sprayed with asbestos for fire protection, it was packed into ceiling voids as a firebreak and asbestos paper insulated electrical equipment.

Deadly Dust Victims

The company has joined the EPA's National Partnership for Environmental Priorities Program and committed to replacing, on average, 120 miles of paper insulated leaded covered cable (PILC) with non-leaded solid dielectric cable annually.

United States: Con Edison Honored By EPA For Removing Oil Filled Lead ...

The Neptune cable is the first 500kV submarine cable links using mass impregnated, paper insulated technology that has virtually no impact in case of external damage.

New Jersey-New York Undersea High Voltage Transmission Project ...