Underground Service Entrance Cable Requirements

Meter base mounted on exterior wall of house or mobile manufactured home.

Underground service entrance cable requirements.

Direct burial cable rigid or intermediate metal conduit non metallic raceway pvc 24 inches 6 inches 18. Cu copper. In general bury the nonmetallic conduits 18 inches below grade or 12 inches if protected by 2 inches of concrete or equivalent. According to 338 2 there are two types of service entrance cables.

4conduit minimum depth 36 inches. Service entrance disconnect and location shall conform to the latest version of the nec and all local ordinances. Nec 300 5 underground wiring conduits and raceways direct buried cable or conduit or other raceways shall meet the following minimum cover requirements. Al aluminum conductor.

For overhead service weather head must be a minimum of three feet above the roof. Single mobile home underground service alternate meter pedestal figure 10. Any conduit crossing under a road shall be schedule 80. Requirements for nonmetallic conduits nonmetallic conduits or raceways approved for buried cable give less protection than metal conduits and require greater burial depths.

At 18 inches you can use thwn 2 conductors inside a continuous length of pvc conduit which protects the wire all the way through the trench to the house. 5trenches to be in as straight and direct a line as possible. 14 2 14 gauge 2 conductors etc. 14 2 wg 14 gauge 2 conductors with ground etc.

A disconnecting means must be provided for all. For underground service the poured footing must be notched out for the conduit. Conduits installed less than 36 inches in depth require cooperative engineering approval and shall beencased in concrete to cooperative specs depths specified are to finished grade. Single phase underground service meter installation figure 9.

Current transformer cabinets overhead or underground service window type ct s figure 11. 12 2 12 gauge 2 conductors. Type se or service entrance cable having a flame retardant moisture resistant covering or type use which is service entrance cable identified for underground use having a moisture resistant covering but not required to have a flame retardant covering. How to translate the electrical wire markings on nmc cable.

600 v maximum voltage rating for typical residential nm electrical cable. Minimum 6 copper ground wire securely stapled to wall.