Also provide one box for multiple (6 or more) terminations.ĥ.5 Pull boxes – provide one box for every 18 meters of conduits length depending upon the length of run. 3- for two-wire single phase with neutralĥ.1 Octagonal boxes – provide one box for each lighting fixturesĥ.2 Utility box 4”x 2” – provide one box for each switch, duplex outlet or special outlet (small)ĥ.3 Square box 4” – provide one box if the conduits terminating exceed 4 conduits or special big outlets.ĥ.4 Square box 4 11/16 – provide one box for one-inch diameter conduits or for special purpose outlets. Total length divide 3 and add 5%Ĥ.2 Wire – multiply the length of conduct by the following constantsī. Check the shortest possible route and avoid obstructions. Determine the approximate length of wire and conduct for the panel homerun to the main panel or main distribution panel.Ĥ.1 Conduits – measure the length of the run.Round off and add 10%.ģ.5 Set aside the papers and data temporarily. Round off and add 10%.ģ.4 Sum up the total length of wire for each size and divide by 150 to get the no of rolls. The sum of the products (lengths x the no of wires) shall be the approximate length of wire.ģ.3 Sum up the total length of conduit per size and divide by 3. The trace of the route must be followed as per drawing.ģ.2 For the wire – measure the length between outlets and the length shall be multiplied by the no. Determine the approximate length of wire and conduit per circuit.ģ.1 For the conduit (each circuit) - measure the length from the last outlet to the panel using the scale.Study plans, drawing and specifications.Ģ.1 Coordinate with Civil, Mechanical and Architectural Estimators about the followingĢ.1.3 Height between finish floor and ceilingsĢ.1.4 Major beams and columns thru which conduits may not passĢ.1.5 Other architectural/civil/mechanical drawings indicating positions of the lights, special outlets or aircon unit equipment.Ģ.2 Check and make a physical count of the followingĢ.2.1 Lighting fixtures – number of each type of fixturesĢ.2.4 Panel boards – make a complete description of each panel board.Ģ.2.5 Other electrical equipment to be supplied by contractorĢ.3 Study carefully the circuit runs and the riser diagram together with the schedule of load.Mark papers indicating the panel no., circuit number and the location of the circuit run. Prepare paper, pencils, scale and rulers.