CON 4003 Construction Estimating Prof R. V. Locurcio

4-Nov23ElectricalCh 15Locurcio 6-Nov24No class 11-Nov Veterans Day - no class 13-Nov25Openings & FinishesCh 10LocurcioNA 18-Nov26Work on Semester ProjectsNA 20-Nov27Course review & evaluationsNALocurcioNA 25-Nov28Work on Semester ProjectsNA 27-Nov--No Class - ThanxgivingNA 2-Dec29Term Project PresentationsNAProf PanelNA 4-Dec30Study Day TBA31Final ExamTBALocurcioNA

 Electrical Devices  Nominal amount  Fixtures, outlets, switches, panels  Transformers and motors  Wiring  Measured length  Double check plans  Vertical and horizontal

 Electrical diagram  Symbols?  Missing information?  Circuit design  Finite number of devices per circuit  Three to four wires  Construction  Conduits and connections  Boxes, switches, and panels V=i x R P= i x V

 Romex: outlets, lights, switches  2-3 conductors and a ground wire insulated together  Hot, ground, and neutral  #12 or #14 wires  110 volts will still ruin your day Heavy duty appliances: Washer, dryer, oven, A/C 3-4 wires in a circuit 2 wires carrying 110v, ground, and neutral #8 or #10 wires 220 volts will make you crispy Horizontal distance + vertical distance = total length of wire needed

 Determine the number of devices and wiring needed to complete the lighting shown in the figure. The light fixtures are to be recessed-can fixtures. The outlet is existing and will be used to supply the power to the lighting. Use Romex #12 wires. The ceiling height is 9 feet. Questions? Dimensions? Length? Ceiling height? Switch and outlet height? Dimensions? Length? 10 foot 4 foot & 1 foot Assumptions:

Quantities 4 can lights with trim and bulbs 2 three-way switches, box & cover #12 copper wiring Ceiling lights = 2 x 6.33’ + 4’+ 4.25’+2’= 23’ Wall Switch = 6’+4’+2’= 12’ Outlet = 2’+3’+2’= 7’ #12 copper wiring Total= 23’ +12’+7’+25’=67’ (3 wires ) 2 nd Switch = 6’+11’+6’+2’= 25’

8’ 6’ 4’ 2’ 3’ 7’ 6’ 8’ 6’ 3’ 4’ 6’ 10’ 6’ 40ft

All commercial wiring requires conduit or raceways (except low voltage) Flexible and ridged conduit Much greater length of wire due to size, scale, and method of construction Many more boxes, outlets, switches, and threaded connectors Greater definition in circuit design due to electrical requirements and equipment Multiple electrical panels rather than one

Determine the number of electrical devices, conduit, and wiring needed to complete the lightning shown in the figure. The light fixtures are to be 120 volt, 4 foot by 2 foot fluorescent light fixtures with three bulbs. The power will be provided to the light switch on the left. Use #12 wires in a ½ inch conduit. The ceiling height is 9 feet, and the conduit will be run at a height of 12 feet. Questions? Approach?

Quantities  Two 120v, 4’x2’ fluorescent light fixtures  Six light bulbs, two junction boxes with covers, two 3-way switches with single gang boxes and covers  Ten screw/threaded connectors  Two 5’ lengths of flexible conduit  Ridged conduit length=wire length  Fasteners to secure conduit in place

#12 wire (red & black) between switches Length 1=9’+20’+9’+2’=40’ #12 wire (black & white) from switches to junction boxes to fixtures Length 2=(9’+5’+2’)+(10’+2’)+2x(5’+2’)=42’ #12 wire (green) switches to junction boxes to fixtures Length 3= 2x(9’+5’+2’)+(10’+2’)+2x(5’+2’)=58’ Totals Red wire=40’ Black wire=82’ White=42’ Green=58’

Determine the electrical components needed to complete the electrical distribution system (excluding wire from the panelboards) for the schedmatic shown in the figure. The distance to the meter is 60 feet through a 3 ½ inch conduit that includes three 90-degree bends. The wireway is 5 feet long, and the three panels are mounted 1 foot above the wireway. The panelboard schedules are shown in the second figure on next slide.

Panel P: 120/208 three phase 225 amp panelboard with 30 spaces. Serviced by three #4 wires and one #12 70’ 1 foot of 2” conduit between panelboard and wireway Two 2” set screw/threaded connectors Breakers: Starting from the meter, 60’ of 3.5 inch conduit, three 90- degree bends, 2 set-screw/threaded connectors ( meter to wireway connection), and one 5 foot wireway Two 90 amp, 3 pole One 35 amp, 3 pole One 30 amp, 3 pole One 20 amp, single pole Three 30 amp, single pole Two 25 amp, single pole Three 30 amp, 2 pole

Panel L: 120/208 three phase 150 amp panelboard with 30 spaces. Serviced by four #1 70’ 1 foot of 1 1/2” conduit between panelboard and wireway Two 1 1/2” set screw/threaded connectors Breakers: Twenty 20 amp, single pole

Panel D: 120/208 three phase 150 amp panelboard with 30 spaces. Serviced by four #1 70’ 1 foot of 1 1/2” conduit between panelboard and wireway Two 1 1/2” set screw/threaded connectors Breakers: Twenty-three 20 amp, single pole

Read the specs while looking at the electrical plan  Highlight or mark everything. NO EXCEPTIONS  This includes, but is not limited to: outlets, switches, and lights by type, circuit breaker, boxes, wiring layout, ground…  Check the Florida or international building code for missing dimensions Submit RFIs as soon as possible if necessary Get bids from various wise, professional sub-contractors