Section 4: Conduit, Conductors and Ground Boxes

Item 618 - Conduit

Item 618 contains specifications for furnishing and installing conduit. This includes conduit, fittings, junction boxes, supports, trenching, and backfill. Conduit is measured by the linear foot.
The material specifications are in DMS-11030, "Conduit." Standard sheet ED(1) contains general material and construction details that apply to all conduit installations and should be included in all plan sets that use conduit. Standard sheet ED(2) contains details for conduit supports and should be used when conduit is to be mounted on structures.

DMS-11030

DMS-11030 specifies the materials for Rigid Metal Conduit (RMC), Polyvinyl Chloride Conduit (PVC), and High Density Polyethylene Conduit (HDPE). Conduits that meet the material specification are listed by their types under Item 618 in the MPL for Roadway Illumination and Electrical Supplies.
DMS-11030 also contains specifications for conduit fittings and junction boxes. These materials are not listed on the MPL, but compliance with the specifications should be verified in the field.

Item 620 - Electrical Conductors

Item 620 contains specifications for furnishing and installing conductors. This includes conductors, splices, ground rods, and breakaway connectors. Conductors are measured by the linear foot.
The material specifications are in DMS-11040, "Conductors." Standard sheet ED(3) contains general material and construction details that apply to all conductor installations and should be included in all plan sets that use conductors.

DMS-11040

DMS-11040 specifies the materials for type XHHW conductors. Conductors that meet the material specification are listed by their types under Item 620 in the MPL for Roadway Illumination and Electrical Supplies. This section of the MPL also contains approved breakaway fuse holders that meet the specification.
DMS-11040 also contains specifications for splicing materials and ground rods. These materials are not listed on the MPL, but compliance with the specifications should be verified in the field.

Item 621 - Tray Cable

Item 621 contains specifications for furnishing and installing tray cable. Tray cable is a multi-conductor cable assembly and follows the requirements in the NEC for "Power and Control Cable Type TC." The material specifications are in DMS-11050, "Tray Cable." Tray cable is measured by the linear foot.

DMS 11050

DMS-11050 specifies the materials for 3-conductor and 4-conductor tray cable with type XHHW insulation. Cables that meet the material specification are listed with their sizes under Item 621 in the MPL for Roadway Illumination and Electrical Supplies.

Item 622 - Duct Cable

Item 622 contains specifications for furnishing and installing duct cable. Duct cable is a factory assembly of conductors in a non-metallic raceway, and follows the requirements in the NEC for "Nonmetallic Underground Conduit with Conductors." Duct cable is measured by the linear foot.
The material specifications are in DMS-11060, "Duct Cable." Standard sheet ED(11) contains general material and construction details that apply to all duct cable installations and should be included in all plan sets that use duct cable.

DMS 11060

DMS-11060 specifies the materials for HDPE duct cable with XHHW conductors. Cables that meet the material specification are listed with their sizes under Item 622 in the MPL for Roadway Illumination and Electrical Supplies.

Item 624 - Ground Boxes

Item 624 contains specifications for furnishing and installing ground boxes. Ground boxes may be either factory-made or cast in place. Item 624 includes ground boxes, covers, and concrete aprons.
The material specifications are in DMS-11070, "Ground Boxes." Standard sheet ED(4) contains general material and construction details that apply to all ground box installations and should be included in all plan sets that use ground boxes.

DMS 11070

DMS-11070 specifies the materials and requirements for precast polymer concrete ground boxes and covers. Five sizes of the Types A, B, C, D, and E are specified. Ground boxes that meet the material specification are listed by their types under Item 624 in the MPL for Roadway Illumination and Electrical Supplies.