How to calculate the quantities of building electrical installation?


15

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08

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Current transformer (TA) and voltage transformer (TV) are used to measure voltage, current, electric energy and relay protection

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11

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High voltage control equipment: high voltage control console, cabinet and panel, which are used in power plants, industrial and mining enterprises’ power transformation and distribution stations (stations), and main equipment for receiving power and large-scale high-voltage AC motor startup and protection

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Busbar installation busbar: there are high voltage busbar of power transformation and distribution device and low voltage busbar of workshop power distribution

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When the drawing scale is correct, the pipe which can only be laid obliquely can be measured with scale

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The key points of project visa, progress payment and settlement audit must be mastered! What are the six problems to be solved in the implementation of list quotation? What is the preparation? What is the impact of canceling the project cost qualification approval on the industry?.

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04

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Calculation rules for low voltage control and distribution equipment: complete sets of power, lighting control and distribution cabinets, boxes, screens, etc., regardless of model, specification and installation mode, are measured by “sets”

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TM installation: excluding transformer oil withstand voltage test and transformer system commissioning

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09

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Power and control cable} schematic diagram of cable buried or entering into the trench} L = (L1 + L2 + L3 + L4 + L5 + L6 + L7) × (1 + 2.5%)

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The expression of cable length by laying method and position: cable length = (2 × end length + up and down lead length + directly buried ground length + cable trench length + protection pipe length + steel cable length + wall length + shaft length + bridge length + trench length + ladder length + line length, etc

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Electrical wiring rules: lighting and power lines are calculated according to “single line extension meter” regardless of type, specification, model and laying mode

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13

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10

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+ cable reserve) × (1 + 2.5%) cable end: fabrication and installation shall be measured by “piece”

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05

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Calculation rule: single piece “extended meter” calculation

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Calculation rule: the above devices are measured by “set”

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Pay attention to the difference

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When wiring terminals need to be welded (pressed) for the wires in and out of cabinets, boxes and screens, they shall be measured by “pieces”

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Methods: horizontal pipe was calculated by the axis of wall and column in building plan

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Laying cable trench in cable trench: entering into the trench, not entering into the trench

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14

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In the installation cost, from the distinction of cables and wires to separate calculation, from electrical bridge to climbing wall wiring, from lightning protection and grounding to weak current intelligence, each link is more complex and difficult to understand

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Calculation rules: control panel, relay panel, simulation panel, power supply panel, DC panel, console and box type distribution room are measured by “set”

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12

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The models are GG, GFC, GBC, etc

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For 10kv High-voltage Overhead indoor installation, the suspended insulator XP below 10kV shall be measured by “string”; the outdoor high-voltage fuse WR below 10kV shall be measured by “group”; the steel through plate shall be measured by “block”; the wall conduit CLB below 10kV shall be measured by “piece”; the arrester FS below 10kV shall be measured by “group”; the indoor and outdoor supporting insulator Za below 10kV shall be measured by “piece”; the bracket and fittings shall be measured by “piece” , calculated in “kg”

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Pipe threading length = (piping length + reserved length of wire) × number of wires in the same section

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01

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Piping quantity rules: piping shall be calculated according to different pipe materials, specifications and laying methods (light and dark), and the length of junction box (box), lamp holder box and switch box shall not be deducted

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The power transformation and distribution devices and equipment are calculated in sequence from the entrance devices 03

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Laying sand and covering brick for cable trench: calculated by trench length “m”

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Calculation rules: regardless of steel, stainless steel, aluminum alloy, FRP, plastic bridge, all calculated by “m”

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Calculation rules for transformer installation: according to different voltage levels, different capacities and different types, they are measured in “sets”

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Install circuit breaker (QF), load switch (QL) and isolating switch (QS) in the power distribution device to open and close the normal load circuit and protect and control the high-voltage electrical equipment

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At present, there are three types of fixed, handcart and movable in China

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Main point: calculate circuit by circuit from the distribution box

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Cable tray installation: it is divided into ladder type and tray type (perforated tray and non perforated tray), which is generally composed of straight section, elbow, tee and other accessories, supports and hangers

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The light and dark box wiring (branching), socket, switch, lamp cap and other boxes for piping and wiring shall be measured according to “number”

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The installation includes electromagnetic, spring energy storage, manual and other operating mechanisms

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Calculation rules of power and control cable installation: power and control cable under 10kV; no matter the laying method or position, it is calculated by “m”

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High pressure and low pressure equipment base and support: groove (angle) steel base and support fabrication and installation shall be calculated according to “kg” and “m”

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02

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06

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(refer to budget quota of Construction Engineering) uncovering and covering cover plate of cable trench: “m” calculation; fabrication and installation of support in trench: “kg” of steel and “m3” of concrete calculation

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07

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Ditch masonry: Earthwork Volume “m m3”; ditch bottom and wall bricklaying or pouring “m m3”; ditch wall and bottom plastering with cement mortar “civil engineering”; ditch cover fabrication “m m3”; purchase value and freight

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Common hard bus: copper (TMY), aluminum (lmy)

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Common wires: single core, multi-core; aluminum core, copper core; plastic and rubber insulation

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For the earthwork of cable trench directly buried with cables, the calculation is based on “m 3”: v = SL, for each 1m trench length of two cables, v = 0.45M, for each additional cable, 0.153m 3 is added for each 1m trench

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L bus = (single piece extension meter length of bus design + reserved length of bus) × (1 + 2.3%) production and installation loss: 2.3%

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Including the installation of 5.5 ~ 16mm2 electrical connecting jumper wire, grounding wire and grounding terminal between each section of the bridge

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Today, I will learn how to calculate the electrical engineering quantity and method with you

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TM classification: the cooling methods are oil immersed and dry type; the phase number is divided into single phase and three phase; the coil material is divided into copper coil and aluminum coil; the iron core is divided into hot rolled and cold rolled silicon steel sheet, etc

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