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# Building Services Lecture 6

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• 1. BUILDING SERVICES – I Lecture - 6 Unit - 3
• 2. Electrical Supply • Electricity is supplied through “wires”, comparable to pressured water supply pipes. • At points along the wires are lighting outlets, switches, and receptacles. Turning on a light switch or plugging equipment into a receptacle is comparable to opening a faucet/valve. Electrical supply Can be compared to Water supply
• 3. Voltage Equivalent to water pressure; pump controls water pressure; generator or battery controls voltage; standard voltage is 120/240; most common low voltage is 12V
• 4. Amperage Electrical current; equivalent to flow of water (gal/sec)
• 5. Resistance: Opposition to flow of current; amount of resistance affected by: • Material • Diameter • Length
• 6. Wattage Unit of power; rate at which a device converts current to another form (heat or motor) (Voltage x Amperage)
• 7. Watt-hour: Unit of energy; measures amount of energy/electricity used in one hour Watts x hours of use=watthours or KWHR, e.g., 100 w x 24hrs = 2400 whrs/day = 2.4 KWHRs 2.4 KWHR/day x 30 days/mo. = 72.4 KWHR/mo 72.4 KWHR x Rs. 9/KWHR = Rs. 651/mo
• 8. Direct Current Direct current: Current flows in one direction
• 9. Alternating Current Alternating current: Current flows in single direction but reverses direction at regular intervals
• 10. Electrical Distribution and Home Wiring ELECTRICITY GENERATION ELECTRICITY TRANSPORTATION ELECTRICITY DISTRIBUTION
• 11. Service connections 240/120V, 3-wire system
• 12. Distribution Panel/Circuit Breaker Box
• 13. 115120V 220240 V Distribution Panel And Circuits
• 14. Electrical Fittings And Appliances
• 15. Wiring
• 16. Conductors Wire over which electrons are transmitted
• 17. Copper Wire: Relation between Diameters and Amperage and Resistance
• 18. Insulators Holds electrical current in proper path,
• 19. Mains
• 20. Grounding For electrical safety, it is required that every circuit be grounded. This assures that all metal parts of a circuit that a person might accidentally touch are maintained at zero voltage, because they are connected directly to the ground. The grounding wire is attached to the third slot on a wall receptacle.
• 21. Grounded to water pipe or ground rod
• 22. If hot wire touches cover plate of ungrounded switch or outlet, the plate will be electrically charged. If the body touches the plate, the body becomes part of the circuit and will receive a shock.
• 23. Grounding to reduce shock hazard