Distribution

Crockett Distribution Substation Distribution Development Plan and Internal Request Houston, Texas As part of the Client’s 2022 DDP, DCCM provided engineering and design for the Crockett Substation. The design of 25,000 feet of new build circuit and upgrades to the existing overhead facilities. This included multiple terminal poles, capacitor banks, and pole top switches that were all done in highly congested areas with limited space and clearances. Several places required circuits to be built double-stacked due to limited space in the established commercial and residential areas. In addition, the plan included six railroad crossings that must meet strict clearance and enhanced building requirements. Three of these crossings required the use of load-bearing concrete poles, and two of these were double-circuit crossings. In addition to the DDP work, DCCM provided engineering and design of the Internal Request (ILRT) work going on inside the substation yard to convert the outdated Crockett substation to a low-profile design. In doing so, our design team had to relocate existing escapes out of the way so that the new low-profile substation could be built. This all had to be done while keeping the circuits energized. DCCM came up with the most efficient action plan. After many field meetings where our staff represented the Client’s Overhead department for this project, we designed and engineered four overhead and six terminal pole work orders and provided consulting for the entirety of this project. We had to relocate circuits CR01 through CR06 and coordinate our work with the substation, transmission, and MUG engineering. At a Glance 25,000 Feet of Build Circuit Markets Power Services Power

Brazos River Overhead Distribution Design Fort Bend County, Texas The Client retained DCCM to provide engineering and design for the installation of a new 35 kV circuit crossing the Brazos River. This crossing represented a critical tie needed to bring a 35 kV line to feed new developments. This was required to relieve load on existing circuits. The planning department had originally called for this new 35 kV line to double-stack with an existing 12 kV crossing. However, due to distance and NESC® construction grade requirements, this new circuit had to be located on the opposite side of the street. Abstracts and topography maps were required to ensure proper pole placement. To make up for sag of over 975 feet of spacing and ground elevation changes relative to the bridge between poles, the concrete poles had to be 110 feet. This job required working closely with the Client’s Standards and Materials department to create special standards of framing specific to this work. The project required permitting from TxDOT, GLO, and USACE. At a Glance 110 Foot Concrete Poles Markets Power Services Power

Overloaded Pole Replacement Program Houston, Texas DCCM provided electrical distribution pole analysis for the Client’s pole replacement program. We received periodic spreadsheets from the Client listing numerous poles to be analyzed. The poles were deemed to be possibly overloaded structurally due to conductor size, type of framing, angle of distribution line, equipment, or other circumstances. Overloaded poles were evaluated to ensure proper clearances over roadways, railroads, or other types of terrain. Each pole had a unique six- or seven-digit identification number, and DCCM was able to locate the pole in the Client’s GIS mapping system. A notification, work order, and DDS project were created for each pole. We were limited to one pole per order, thus creating the need for multiple projects. The poles were spotted in DDS with adjacent facilities for analysis. Structural and profile analyses were performed for the overloaded poles. The structural analysis evaluated the side bearing, vertical bearing, insulator, guy, anchor, cross-arm, and stress on the pole itself. The profile analysis measured the clearance of the conductors under maximum load conditions. The structures were replaced with a larger/taller poles to meet the Client’s standards. A subsequent sketch, material list, and work order were created and scheduled for construction. At a Glance Electrical Distribution Pole Analysis Markets Power Services Power

Distribution Development Plan Houston, Texas DCCM was responsible for engineering and design of the Client’s 2014–2023 distribution development plans. This covered new circuits and system hardening of electrical overhead distribution facilities for new and existing substations. DCCM coordinated with the Client’s MUG, Overhead Consultants, Distribution Planning, Land and ROW, and Forestry departments to determine the most feasible design for the projects. DCCM worked with the Transmission department for crossings and designs within transmission ROW and assisted in the design of three- phase 35 kV and 12 kV primary, three-phase underground terminal poles, pole top switches, reclosers, and capacitor banks. The projects included multiple freeway crossings requiring concrete structures and road closures. Proper fuse coordination was applied on all small wire laterals. Permits were acquired from TxDOT, Union Pacific Railroad, surrounding cities, and counties where neede At a Glance 2014 – 2023 Distribution Development Plan Markets Power Services Power