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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 (volts) (amperes) (OHMS) Fatalities have occurred at 50 volts or less! I= E/R .05 amps (50 mA) = .11 amps (110 mA) = 50V 1,000 OHM 110V 1,000 OHM Effects of Current 8-15 mA= 15-20 mA = 30-100 mA= Pain. Pain & muscle contraction. Severe pain and paralysis of breathing muscles. 100-1,000 mA= Ventricular fibrillation. (may cause death) > 1,000 mA = Heart normally stops. Human Resistance Body Area Dry Skin Wet Skin Internal Body Ear to Ear Resistance (OHMS) 100,000 to 600,000 1,000 400-600 100 So How Do We Protect Ourselves? • Effective Grounding. • Electrical Protective Devices. • Insulation and Guarding of Live Parts. • Inspection & Maintenance. • Training. PROTECTIVE MEASURES • • • • • Equipment Grounding. Fuses and Circuit Breakers. Ground Fault Circuit Interrupters (GFCI). Double Insulated Tools. Wire Insulation. 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. 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 Groups, continued • Safety Related Work Practices: – Protection of Employees – Passageways and Open Spaces – Lockout and Tagging of Circuits Groups, continued • Safety Related Maintenance and Environmental Considerations: – Maintenance of Equipment – Environmental Deterioration of Equipment Groups, continued • Safety Requirements for Special Equipment: – Batteries – Battery Charging Other Considerations • Temporary Lights– – – – 405(a)(2)(ii)(E) 405(a)(2)(ii)(F) 405(a)(2)(ii)(G) 405(a)(2)(ii)(J)