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Electrical Safety and Safe Work Practices

Electrical Safety and Safe Work Practices. Why Electrical Training?. What Problems Do You See in Your work area?. Damaged plug Missing ground pin Shorted out – the missing prong was found still in the outlet... Why is a missing ground pin a problem?.

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Electrical Safety and Safe Work Practices

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  1. Electrical Safety and Safe Work Practices

  2. Why Electrical Training?

  3. What Problems Do You See in Your work area? • Damaged plug • Missing ground pin • Shorted out – the missing prong was found still in the outlet... • Why is a missing ground pin a problem?

  4. What Problems Do You See in Your work area? • Damaged GFCI outlet • Why didn’t the GFCI prevent the damage?

  5. What Problems Do You See in Your work area? Spliced and taped cord on a lamp – fire and electrocution hazard

  6. Don’t do this at home.....

  7. Home Electrical Safety • Do not connect more than 3 light sets together & do not overload extension cords (use an outlet strip with built-in overload protection). • Turn off all Christmas lights prior to leaving your home or going to bed. • Test your smoke and carbon monoxide detectors, replace batteries. • Plug lights & decorations into circuits protected by GFCIs (ground fault circuit interrupters).

  8. Why Follow the Rules? • Electrical shock • What is the highest voltage on production equipment here at BD – Sandy? • When was the last electrical shock incident (other than static electricity) at BD – Sandy? • Arc Flash hazard • Electrical fires • Electrical burns

  9. ELECTRICAL HAZARDS • Misnomer: Electricity flows through the path of least resistance. (It flows through ALL paths…) • Electric shock occurs when the human body becomes part of the path through which electrical current flows. • The direct result can be electrocution. • Burns can result when a person touches electrical wiring or equipment that is energized • The indirect result can be injury resulting from a fall or movement into machinery because of a shock.

  10. Arc Flash/ Arc Blast • Occurs when high amperage current jumps a gap (short circuit) – such as when un-insulated tools are being used on live electrical circuits... • Arc Flash / Arc Blast injuries was the number one source of electrical injuries, and has been for many years… • An arc blast can occur when electrical cabinets/panels are open • Temperatures can be as high as 35,000 F • Metal, Molten metal, or other objects • Pressure Wave

  11. ELECTRICAL HAZARDS • Explosions: Occur when electricity provides an ignition source for an explosive mixture in the air. • Flammable vapors • Dust (plastic dusts, grain dust, other organic material, metal dusts,etc) • Fires: Electricity is the most common cause of fires both in the home and in the workplace. • Defective or misused electrical equipment is a major cause. • Electrically Classified Areas and Equipment: Never substitute parts, never make modifications without an Engineering Review!

  12. ELECTRIC SHOCK Effects of electric shock depend on: -- Current & voltage -- Resistance -- Path through body -- Duration of shock

  13. CURRENT & VOLTAGE • As alternating current increases: • Tingling gives way to muscle contractions • Pain develops • Control of muscles becomes increasingly difficult • At 15 mA, victims cannot let go of the conductive surface • At 70 mA, ventricular fibrillation of the heart occurs (a typical circuit is 15 amps plus) • Death follows in a few minutes • Heavy current flow can also result in severe burns (internal & external) & heart paralysis

  14. Nominal System Voltage Range, Phase to Phase Limited Approach Boundary Restricted Approach Boundary Prohibited Approach Boundary Exposed Movable Conductor  Exposed Fixed Circuit Part  Less than 50  36 in 36 in Avoid Contact Avoid Contact 50-300  10 ft 0 in 3 ft 6 in Avoid contact Avoid contact 301-750  10 ft 0 in 3 ft 6 in 1 ft 0 in 1 in 751-15 kV  10 ft 0 in 5 ft 0 in 2 ft 2 in 7 in 15.1 kV-36 kV  10 ft 0 in 6 ft 0 in 2 ft 7 in 10 in 36.1 kV-46 kV  10 ft 0 in 8 ft 0 in 2 ft 9 in 1 ft 5 in BY-STANDERS AND APPROACH DISTANCES(AKA Electric Shock Protection Boundaries)

  15. General Electrical Concerns • Extension cords can be made ONLY by “Qualified Individuals” (see above…) • Do not use gang plugs (wall mount box on end of extension cord with 2 or more outlets installed…) • Do not use cords with broken ground prongs • Do not piggy-back surge protectors • Do not use zip cords (light weight household type extension cords that do not have a secondary insulation sheath)

  16. General Electrical Concerns • Keep all electrical equipment clear from water and moisture • Building Circuit Breakers can be reset ONLY by Qualified Facilities Personnel • The only persons authorized to open and do any work in an electrical cabinet on production equipment are: • Qualified Electro-mechanics • Qualified Engineers

  17. Don’t do this at Home....

  18. Contact Info Ron Ruiz Rruiz3@slcc.edu

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