Article 369 Insulated Bus Pipe IBP/ Tubular Covered Conductors (TCC) Systems.

IBP is a cylindrical solid or hollow conductor with a solid insulation system, having a grounding layer and conductive grading layers imbedded in the insulation, and provided with an overall covering of insulating or metallic material.
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IBP is a cylindrical solid or hollow conductor with a solid insulation system, having a grounding layer and conductive grading layers imbedded in the insulation, and provided with an overall covering of insulating or metallic material.

Code Change Summary: New Article on Insulated Bus Pipe (IBP).

New Article 369 covers Insulated bus pipe (IBP), also known as Tubular Covered Conductor (TCC).

According to the Article 100 definition, Insulated Bus Pipe (IBP), also referred to as tubular covered conductor (TCC), is a cylindrical solid or hollow conductor with a solid insulation system, having a grounding layer and conductive grading layers imbedded in the insulation, and provided with an overall covering of insulating or metallic material.

IBP has been used for many years in Europe in industrial and utility applications, in Naval shipboard applications, and in utility applications throughout the United States.

Highlights from new Article 369 include:

Insulated bus pipe is certified (listed) using UL 1366 under UL Product Category CVZL.

According to the UL Guide Info for Product Category CVZL, IBP may be provided with an overall metal covering for each individual bus, but is not provided with an overall enclosure that encloses all phases of the IBP system.

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Article 369 Insulated Bus Pipe IBP/ Tubular Covered Conductors (TCC) Systems.

Below is a Real Question from our Electrical Continuing Education Courses for Electrical License Renewal:

Based on the 2023 NEC, which of the following is true?

A: IBP systems must be listed.
B: IBP systems are permitted to be used on systems rated 50,000 volts or more.
C: IBP systems shall NOT be run through walls.
D: IBP systems shall be concealed by the building structure.
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