ELECTRICAL DESIGN GUIDELINE STEPS Maria C. Gonzalez.
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Transcript of ELECTRICAL DESIGN GUIDELINE STEPS Maria C. Gonzalez.
ELECTRICAL DESIGNGUIDELINE STEPS
Maria C. Gonzalez
ELECTRICAL DESIGN STEPS
• 1.What equipment do you want to install?
• 2. How do we install it?– Power requirements: conductor size– Communications requirements
• 3. Cost
ELECTRICAL EQUIPMENT
ELECTRICAL PLAN
POWER REQUIREMENTS
• STEPS:
• 1. Find the total load in Watts for the electrical equipment you want to install.
• 2. Calculate the current
• 3. Calculate the conductor size
POWER REQUIREMENTS
• CALCULATIONS:
• 1. Total Wattage
• 2. Calculate the current knowing the total wattage W:
VvoltageV
factorpowerPF
wattsW
VPF
WAI
WWW
T
T
120;
8.0;
;
)().()(
....21
CONDUCTOR SIZE• Using Ohm’s Law, find R
• Resistance per unit length km =
• voltage drop is 5% of 120V or 6 v
• D; distance in Km from PG&E pole to service cabinet
)(
)()(
R
VdropVoltageAI
D
R
2
CONDUCTOR SIZE TABLE Resistance /km Size AWG Ampacity*
10.07 14 206.33 12 253.97 10 352.55 8 501.60 6 651.01 4 850.82 3 1000.62 2 1150.49 1 1300.38 1/0 1500.31 2/0 175
ELECTRICAL ELEMENTS 1 POWER AND COST
ITEM LOCATION/USE $COST WATTS
Lighting ramp, bridge 100 310
Traffic Signal ramp, toll bridge 500 150
Traffic Sensor:
Everywhere. To gather traffic information: speed, # vehicles
-A). loop wire 600/lane 50
-B) radar 800/all 10
- C)TV camera
1000/all 50
ELECTRICAL ELEMENTS 1Communications
ITEM COMMUNICATIONS FROM DEVICE TO CONTROLLER
COMMUNICATIONS FROM CONTROLLER TO TMC
Lighting
Traffic Signal
Traffic Sensor:
Twisted pair (telephone), fiber optic, wireless
- A)loop wire Loop wire
- B) radar Twisted pair
- C) TV camera
coaxial cable
ELECTRICAL ELEMENTS 2 POWER AND COST
ITEM LOCATION/USE
$COST WATTS
DRIVERAIDS:- Sign Near main
intercrosses46000 17000
- Radio(HAR)
Everywhere,mountain
3000 50
- Callboxes
everywhere 300 10
ELECTRICAL ELEMENTS 2Communications
ITEM COMMUNICATIONS FROM CONTROLLER TO DEVICE
COMMUNICATIONS FROM CONTROLLER TO TMC
DRIVER AIDS:
- Sign twisted pair(telephone outlet)
Twisted pair (telephone), fiberoptic, wireless
- Radio (HAR)
Coaxial to antenna, Twisted pair (telephone), fiberoptic, wireless
- Call boxes
Twisted pair (telephone), or wireless
Twisted pair (telephone), fiberoptic, wireless
ADDITIONAL ELECTRICAL ELEMENTS COST
ITEM USE $ COST
Pole Traffic signal, lighting, TV
2000
Power cabinet To connect with PG&E 3000
Controller Talk with sensors andDriver aids
10,000
Cable:
- loop wire 1.00/m
- coaxial 0.66/m
- Twisted pair 1.20/m
- Fiberoptics 10.0/m
- Power conductor 0.66/m
Conduit One for power, one forcommunications
2.27/m
COMMUNICATIONS APPLICATION BANDWITH
REQUIREMENTS APPLICATION BANDWIDTH
Traffic data very low
Voice low
Real time traffic data high
Video high
High definition video very high
COMMUNICATIONS TECHNOLOGY BANDWIDTH
TECHNOLOGY MEDIUM
BANDWIDTH REPEATER AT (m):
Twisted pair low 600
coaxial high 150
fiber very high 110,000
Cellular Radio (MHz)
medium 2000-16000
Microwave (GHz)
highest Line of sight