# Calculation method of building electrical engineering quantity!

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

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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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0110kv high-voltage overhead indoor installation: suspension insulator XP below 10kV, measured by “string”; outdoor high-voltage fuse WR below 10kV, measured by “group”; steel through plate, measured by “block”; through wall conduit CLB below 10kV, measured by “piece”; arrester FS below 10kV, measured by “group”; indoor and outdoor support insulator Za below 10kV, measured by “piece”; bracket and hardware, Calculated by “kg”

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

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

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

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

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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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(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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04 the power distribution device is equipped with circuit breaker (QF), load switch (QL) and isolating switch (QS) to break and connect the normal load circuit and protect and control the high-voltage electrical equipment

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

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

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

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Main point: calculate circuit by circuit from the distribution box

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

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

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08 power and control cable} cable buried or trench into the home} L = (L1 + L2 + L3 + L4 + L5 + L6 + L7) × (1 + 2.5%) 09 power and control cable installation calculation rules: 10kV power and control cable; regardless of the laying method and position, it is calculated by “m”

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Calculation rule: single piece “extended meter” calculation

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The models are GG, GFC, GBC, etc

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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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Piping quantity rules: piping shall be calculated separately according to “extended meter” according to different pipe materials, specifications and laying methods (light and shade), and the length of junction box (box), lamp cap box and switch box shall not be deducted

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

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

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06 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 high voltage AC motor startup and protection

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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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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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02 power transformation and distribution devices and equipment shall be calculated in sequence from the entrance devices 03 calculation rules for transformer installation: according to different voltage levels, different capacities and different types, they shall be measured in “sets” respectively

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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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12 cable tray installation tray: 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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05 bus installation bus: there are high voltage bus of power transformation and distribution device and low voltage bus of workshop power distribution, pay attention to the difference

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For the earthwork of cable trench directly buried with 10 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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07 low voltage control and distribution equipment calculation rules: complete sets of power, lighting control and distribution cabinets, boxes, screens, etc., regardless of model, specification and installation method, are measured by “set”

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The reserved length of the wire and the extended reading: everyone has a look! How do power companies know who’s stealing electricity? Do you know the purpose of each cable in the network cable? Red wire, yellow wire, green wire..

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Cable trench laying in cable trench: entering into the trench, not entering into the trench

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