Splitter Box, Type 1 splits feeder circuit conductors into multiple branch circuit conductors and comes with pre-installed terminal blocks for three- and four-wire power distribution systems. ASB223R SPLITTER 16X16X5; 3 WIRE 225 AMP
Various numbers and sizes of combination knockouts are provided on all four sides: see Knockout Size and Spacing Table
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Primary Spec Sheet
https://static.graybarcanada.com/Generic/xml_nvent/pdf/documents/7b4c9437c5d96384ae74e9cb2cf931efbe9fdca2.pdf
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Spec Sheet
https://static.graybarcanada.com/Generic/11015_r03672c9xlugozqi.pdf