Electrical Cost Estimating Xác định chi phí của một cài đặt điện được thực hiện chuyên nghiệp bằng cách sử dụng một kỹ thuật cơ khí mà chấm dứt trong một danh sách đầy đủ các thiết bị điện, raceways, đèn, và các thiết bị để "xây dựng vào" cài đặt và một danh sách chi tiết của nhân viên cài đặt giờ các công trình xây dựng sẽ yêu cầu. Chương này cung cấp những hiểu biết và các mẫu để sử dụng trong tính toán ước tính điện. Điện Takeoff Cán Giờ Chi phí Ước tính Tính. | Chapter 15 Electrical Cost Estimating Determining the cost of an electrical installation is done professionally using a set mechanical technique that terminates in a complete listing of electrical equipment raceways luminaires and devices to build into the installation and a detailed listing of installation personnel hours that the construction work will require. This chapter provides insights and templates for use in calculating electrical estimates. Electrical Takeoff and Personnel-Hour Cost Estimating Calculating the value of a typical electrical construction project consists of counting the luminaires and devices measuring the cables and raceways listing the electrical equipment and determining the necessary fittings and hardware required to complete the installation. The first step in this work is the takeoff sequence which includes the following List switchgear including switchboards panels transformers bus duct motor starters and motor control centers and similar equipment items 37 Copyright 2001 by The McGraw-Hill Companies Inc. Click here for Terms of Use. 372 Chapter Fifteen Count lighting fixtures lamps and hanging material Count switch and receptacle devices Count devices in special systems such as fire alarm systems sound systems security systems telephone systems and other special systems Determine the amount of feeder conduit and wire listing fittings and elbows as well Count junction and specialty boxes Count fuses Count connections to large pieces of equipment such as air-handling units chillers pumps kitchen equipment and similar items Determine the amount of branch-circuit conduit and wiring Sketch and take off control wiring for HVAC and other systems Count and list all items on drawings or in specifications that are not colored in at this stage of the takeoff procedure. After listing the items to be installed they must be entered into an estimate sheet such as the one shown in Fig. 15-17 onto which materials prices and labor unit pricing can be
