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Subpart K Electrical

Subpart K Electrical. Long recognized as a serious hazard. Exposes workers to; electrical shock. electrocution. fires/explosions. fatalities and serious injuries. NEC TO OSHA Standard. OHM’S LAW. I= E/R E= Voltage I= Current R= Resistance

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Subpart K Electrical

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  1. Subpart K Electrical • Long recognized as a serious hazard. • Exposes workers to; • electrical shock. • electrocution. • fires/explosions. • fatalities and serious injuries. • NEC TO OSHA Standard.

  2. OHM’S LAW I= E/R E= Voltage I= Current R= Resistance (volts) (amperes) (OHMS)

  3. Fatalities have occurred at 50 volts or less! I= E/R .05 amps 50V (50 mA) = 1,000 OHM .11 amps 110V (110 mA) = 1,000 OHM

  4. Effects of Current 8-15 mA= Pain. 15-20 mA = Pain & muscle contraction. 30-100 mA= Severe pain and paralysis of breathing muscles. 100-1,000 mA= Ventricular fibrillation. (may cause death) > 1,000 mA = Heart normally stops.

  5. Human Resistance Body AreaResistance (OHMS) Dry Skin 100,000 to 600,000 Wet Skin 1,000 Internal Body 400-600 Ear to Ear 100

  6. So How Do We Protect Ourselves? • Effective Grounding. • Electrical Protective Devices. • Insulation and Guarding of Live Parts. • Inspection & Maintenance. • Training.

  7. PROTECTIVE MEASURES • Equipment Grounding. • Fuses and Circuit Breakers. • Ground Fault Circuit Interrupters (GFCI). • Double Insulated Tools. • Wire Insulation.

  8. FLEXIBLE CORDS“Extension Cords” • A must on a construction site. • Must be “industrial grade”. • Must be grounded. • Can have no breaks. • Are for temporary use only.

  9. Subpart K - Four Major Groups • Installation Safety Requirements: • Approval • Examination, Installation & Use of Equipment • Guarding • Overcurrent Protection • Grounding of Equipment Connected by Cord and plug

  10. Groups, continued • Safety Related Work Practices: • Protection of Employees • Passageways and Open Spaces • Lockout and Tagging of Circuits

  11. Groups, continued • Safety Related Maintenance and Environmental Considerations: • Maintenance of Equipment • Environmental Deterioration of Equipment

  12. Groups, continued • Safety Requirements for Special Equipment: • Batteries • Battery Charging

  13. Other Considerations • Temporary Lights- • 405(a)(2)(ii)(E) • 405(a)(2)(ii)(F) • 405(a)(2)(ii)(G) • 405(a)(2)(ii)(J)

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