All sizes have optional adder poles for increased flexibility and ease-of-use|Adder poles can be stacked to form multi-pole units in the field without the use of tools|Adder poles allow for customization of primary and secondary wire combinations|End barriers are also available for sale, catalog numbers can be found in the catalog number selection tables for each size block|Standard aluminum and copper wire connectors are available|Aluminum connectors accept both aluminum or copper wire while copper connectors accept copper wire only|Connectors are all 1-piece tin plated|Insulators are virtually unbreakable, made of glass-filled polycarbonate|See thorough hinged safety covers are optional and provide a greater degree of safety and shock resistance where required|Hinged covers can be installed without tools|1 in through air and 2 in over surface between uninsulated live parts of opposite polarity meets requirements for feeder and branch circuit applications of UL 508A|Polycarbonate safety covers provide dead front protection|One cover is needed for each pole|Each cover has a test probe hole in the center for circuit checking|Covers are optional accessories and catalog numbers can be found in the catalog selection tables for each size block

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