D—4

4. General The workshop building was completed during the year. A motor service depot is being built and extensions to the main office building are planned. DESIGN AND PROJECT PLANNING (a) Hydraulic and Structural Sections See report of Ministry of Works (b) Electrical Section Power-stations. —Detailed drawings of the cabling for Maraetai have been prepared so that the necessary ducts can be incorporated in the building. Drawings of the outdoor station have been completed, and details of earthing and lighting worked out. The Whakamaru Switching-station, earthing, lighting, and control board details have been finalized, and a preliminary design of power-house dimensions and number of machines made. Efficiency tests were carried out at Karapiro and a report is being prepared. New governor oil-pumps and motors were ordered for Nos. 1-4 units, Arapuni, and tenders called for carbon-dioxide fire-prevention equipment. Alterations to drawings for Tuai and KaitaAva necessitated by the commissioning of Kaitawa were brought up to date. Design work on Cobb extensions was advanced a further stage, the control room layout designed, and a specification for the outdoor station prepared after the design was completed. Extensions consisting of four units, together with fuel-handling and water cooling and purifying equipment, were designed for Stoke Diesels. Design work on Waitaki No. 5 unit and that necessary to bring the protection on Nos. 1 and 2 units into line with the rest of the station was completed. Gate-control equipment, including Diesel generating-sets, were designed and ordered for Pukaki. Manufacturers' drawings were checked, and cabling and local service power supplv designed for Tekapo. A substation layout to conform to altered site requirements was designed for Roxburgh. General work included the analysis of tenders and the consolidation of powerstation design data. Substations. —During the year preliminary layout drawings for Tauranga and Haywards were prepared, and design work for Edgecumbe, Lichfield, Longburn, Fernhill, and Edendale was well advanced. The substation previously known as Gisborne is now called Patutahi, and preliminary layouts for the new Gisborne Substation have been investigated. It will be erected nearer the town as a second point of supply to the Poverty Bay Electric-power Board. Detail design work for extensions at Half-way Bush and for the new 110/11 kV. substation at Invercargill is almost complete. Contracts have been let for transformer banks for Dargaville, Penrose, Bombay Hawera, Upper Hutt, and Lichfield, and for all main items of equipment for Haywards ; for switch-gear and steelwork, Bombay, Upper Hutt, Upper Takaka, and Stoke ; for three regulating transformers, 22 kV. current-limiting reactor, and metal-clad switchgear for Penrose ; control boards for Upper Takaka, Half-way Bush, and Stoke ; 11 kV. control panels and switchgear for Ongarue and Khandallah ; and for a 10 mVA. synchronous condenser and metering equipment for Stoke.

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