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CHAPTER 1 SAFETY

CHAPTER 1 SAFETY. GENERAL SAFETY RULES. PPE proper clothing gloves safety glasses Disconnect circuit and lock it out always test circuit before you begin Good housekeeping. LADDER SAFETY. fiberglass ladder proper angle (distance away from building should be about 1/4 of ladder height)

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CHAPTER 1 SAFETY

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  1. CHAPTER 1SAFETY

  2. GENERAL SAFETY RULES • PPE • proper clothing • gloves • safety glasses • Disconnect circuit and lock it out • always test circuit before you begin • Good housekeeping

  3. LADDER SAFETY • fiberglass ladder • proper angle (distance away from building should be about 1/4 of ladder height) • tied off to prevent slipping • Aluminum ladders should not be used around any electrical devices. • Ladders should be inspected regularly

  4. SEVERITY OF ELECTRICAL SHOCK • voltage (30 volts could be fatal) • amperage • resistance (your body has less resistance when wet compared to when dry) • women have less resistance than men-children have less than women • how bad you are injured • vital organ involved • how long you are on the circuit

  5. ASSISTING A SHOCK VICTIM • turn circuit off if possible as quick as possible • don’t become part of system yourself • knock person off system • FIRST AID • always call for medical help • do CPR if necessary • prevent victim from going into shock (comfort them)

  6. CHAPTER 2BASIC ELECTRICITY TERMS AND DEFINITIONS

  7. Electricity--flow of electrons looking for a path to ground (source) • Four things necessary for an electrical circuit • power--voltage • load--some type of resistance • complete path--both a hot wire and a neutral wire • some controlling device--a type of switch

  8. Conductor--any material with low resistance to electron flow. • copper, aluminum, silver, & gold • Insulator--any material with high resistance to electron flow. • plastic, rubber, thermoplastic, & glass

  9. Voltage--potential difference which causes current to flow. Letter symbol (E) • Amperage--flow of electrons in a circuit. Letter symbol (I) • Resistance--opposition to current flow. Measured in Ohms. Letter symbol (R) • Watt--unit of power measurement. Letter symbol (W) 746 watts equal 1 horsepower. (1000 Watts equal a Kilowatt)

  10. Branch-that portion of a circuit that is independent of the rest of the circuit and has full voltage • Hertz- one complete reversal of an alternating current from positive to negative and back to starting place in one second • U.S. uses a 60 hz cycle

  11. Types of electrical circuits • Series --some Christmas tree lights use series circuit where if one light went out they all went out • Parallel--most wiring used in residential and commercial wiring of buildings and controls • Series/Parallel--a combination of both types of circuits such as some fluorescent lighting

  12. Series circuit • electricity has only one path to follow • the amperage remains the same throughout the circuit • the total resistance is equal to the sum of the individual resistance • the applied voltage divides itself proportionately among the individual resistance's

  13. 120 VOLTS 80 ohms 540ohms 12ohms L1 S 1 L2 O VOLTS

  14. 125 VOLTS 130 ohms 40ohms 12ohms L1 S 1 L2 O VOLTS

  15. E I R 120 VOLTS 80 ohms 540ohms 12ohms L1 S 1 L2 O VOLTS

  16. =120 E Rt=632 ?=I 120 VOLTS 80 ohms 540ohms 12ohms L1 S 1 L2 O VOLTS

  17. 7 1 2 4 6 5 .3 =120 E I=.189 Rt=632 L1 120 VOLTS S 1 F 100 ohm 10 A 3.5 hp 300 W M L2 VOLTS

  18. E=? I=.189 R1=? 120 VOLTS 80 ohms 540ohms 12ohms L1 15 v 102 v 2.27 v S 1 .189A .189A L2 O VOLTS .189A

  19. 60W 30W 75W 100W 120 VOLTS L1 S 1 L2 O VOLTS

  20. 480 ohms 240ohms 192ohms 144ohms 100W 30W 60W 75W 120 VOLTS L1 S 1 L2 O VOLTS

  21. .113 A 480 ohms 240ohms 192ohms 144ohms 100W 30W 60W 75W 120 VOLTS L1 S 1 .113 A .113 A L2 O VOLTS

  22. 480 ohms 240ohms 192ohms 144ohms 30W 60W 75W 100W 120 VOLTS L1 S 1 55 v 27 v 22 v 16 v .113 A .113 A L2 O VOLTS .113 A

  23. 60W 30W 75W 100W 120 VOLTS L1 S 1 L2 O VOLTS

  24. 30W 75W 100W 60W 120 VOLTS L1 S 1 L2 O VOLTS

  25. 100W 30W 60W 75W 120 VOLTS L1 S 1 L2 O VOLTS

  26. 30W 60W 75W 100W 120 VOLTS L1 S 1 L2 O VOLTS

  27. 100W 30W 60W 75W 120 VOLTS L1 S 1 L2 O VOLTS

  28. 100W 30W 60W 75W 120 VOLTS L1 S 1 120 VOLTS L2 O VOLTS

  29. 60W 30W 75W 100W 120 VOLTS L1 L2 S 1 O VOLTS

  30. 60W 30W 75W 100W 120 VOLTS L1 L2 S 1 O VOLTS

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