Safer Buildings Coalition Code Topic: Defining Backbone and Distribution

Defining Backbone and Riser

Posted on April 22, 2020

There is much confusion over the terms Backbone (Riser, Vertical) and Distribution (Feeder, Horizontal). This SBC Code Topic provides an explanation, complete with Code references, to help illustrate these important distinctions in in-building cabling systems.

 The definitions for Backbone and Distribution were clarified in the 2019 edition of NFPA 2019. This is important for a number of reasons, not the least of which is the difference in requirements between Backbone and Distribution.

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