ConduitFill allows you to accurately calculate the trade size of a conduit, for a given quantity of conductors. You can select up to 5 different wire sizes per conduit. Each size can be configured in one row. The applet returns with the trade size of a conduit in accordance with the National Electrical Code (NEC), edition 1999 (NFPA70). All recognizable conduit types are supported. The minimum wire size is Awg # 14 and the maximum wire size is 2000 Kcmil.