Where is it stated that UF can't be inside a raceway the entire length of the wire, which in this case was 40'? The terms UF cable and direct-bury cable describe types of cable that are suitable for ground contact. Actually, it s OK for underground use as long as it s inside conduit. Between ground level and 18 inches below grade, you must protect cable with conduit. Single- and multiconductor Types USE and USE-2 are not suitable for use in Direct-Burial Cable. Where it is allowed, the cable must sit a minimum distance below grade, usually at least 18 inches. This electrical wiring question came from: Andy, a Other from Payette, Idaho. But to answer your question, UF cable is legal anywhere that NM cable is legal. What is the correct type of wire to put "inside" an enclosed pole barn for lighting and plugs? Individual THWN wires in conduit underground is used all the time. UF-B Underground Feeder cable is usually manufactured as a two or three conductor cable with or without a ground wire. Direct-buried cable can be used as well as individual conductors when installing wiring under a gravel, concrete or blacktop driveway. raider1 Senior Member. Multicon-ductor Type USE cable contains con-ductors with insulation equivalent to RHW or XHHW. Direct-bury installation is prohibited in many areas. Location Logan, Utah. Nov 7, 2006 #2 Methods for Installing UF Cable Electrical Question: Can UF Cable electrical wire be installed into an electrical conduit? Does code require UF cable or can I use regular NMB 12-2? You can only use UF or USE type cables, either in conduit or without conduit, for underground applications. Does it have to be in conduit? However, if you mean visible in a finished are of t house then it's not fine. Let's clarify what you mean by visible. You can run your wire underground in sealed PVC conduit or you can use type UF underground cable, as long as the wire is protected with conduit wherever it is exposed. Ditto to the above, though, Romex is a royal pain to pull through conduit; i did a 50-foot run and just primed each piece of conduit, fed the wire through piece by piece as i laid the conduit and then cemented and joined each section. Check your local codes, but the basic requirements are (1) adequate gauge wire and breaker, (2) GFCI protection on the circuit, and (3) special underground wire or conduit. But I think I'd probably take the approach of using conduit and THWN wire. UF (underground feeder) can be direct-buried. ground uses for which Type UF cable is permitted by the NEC. Multiconduc-tor Type USE-2 contains insulation equivalent to RHW-2 or XHHW-2 and is rated 90°C wet or dry. If you mean visible in an unfinished attic and/or unfinished basement, then it's fine. Staff member. I don't know of a code section that says you can't use UF cable inside a properly sized (meets conduit fill requirements) conduit. Additional Comments: I like your website, it seems to be very informative. See more about Electrical Wiring for Idaho. If conduit is used individual wires are recommended rather than cable. The cable is UL listed and suitable for operation at 600 volts in almost all installations as specified by the National Electrical Code.