1. Similar to Y-cable, a multiple branch off splitting an output three ways instead of two. Same as http://www.controlbooth.com/forums/glossarys/5536-three-fer.html. Examples: Lex Products molded Y & W pdf cutsheet http://www.4wall.com/1-cable.php 2. Not to be confused with "Type W Cable," one of two types approved for use as portable feeder cable (Type SC being the other).