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What is the correct order of the following operations, performed for conducting the estimation? a) Wiring layout b) Calculation of the total number of connections c) Selection of the main switch board
b, c, a
a, b, c
a, c, b
c, a, b
a, b, c
The process of electrical estimation follows a logical sequence starting with the physical layout design, proceeding to the quantification of electrical points and connections, and ending with the selection of appropriate protective and control switchgear. This ensures that the installation is safe, compliant with regulations, and economically viable.
IS 732:1989 Code of practice for electrical wiring installations
The process of electrical estimation follows a logical sequence starting with the physical layout design, proceeding to the quantification of electrical points and connections, and ending with the selection of appropriate protective and control switchgear. This ensures that the installation is safe, compliant with regulations, and economically viable.
Load┬аCurrent(I)=Voltage├ЧPower┬аFactorTotal┬аPower┬аin┬аWattsтАЛ=Vcos╧ХPтАЛ
Diversity┬аFactor=Maximum┬аdemand┬аon┬аthe┬аsystemSum┬аof┬аindividual┬аmaximum┬аdemandsтАЛ
The design process begins with the wiring layout (a) to visualize cable paths and point locations on the floor plan. Once locations are set, the total number of connections (b) is calculated based on the load requirements and point density. Finally, the main switch board (c) is selected and sized according to the cumulative current rating derived from the previously calculated load.
Wiring layout must precede quantity estimation to ensure accurate measurement of conduit and wire lengths.
The selection of the main switchboard is dependent on the total connected load determined in step (b).
Proper sequencing minimizes costly revisions during the installation phase.
Ensures systematic material procurement.
Reduces wastage of electrical materials.
Ensures adherence to safety standards.
Requires precise architectural drawings prior to estimation.
Complex to recalculate if load requirements change significantly after layout finalization.
Residential building wiring
Commercial complex electrical design
Industrial plant electrification
The sequence a-b-c is standard for electrical project management as it moves from physical representation to technical quantity survey and finally to equipment selection.
Option B is correct because physical routing must be established before quantities can be itemized and equipment sized.
B is correct тАФ The standard estimation process proceeds logically from the physical layout (a), to quantity calculations (b), and finally to switchboard selection (c).
Always remember that in competitive exams, material estimation always follows the physical layout to ensure that branch circuits and protective devices are sized according to the actual electrical load of the specific design.
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