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.

E= Voltage I= Current R= Resistance 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 50V (50 mA) = 1,000 OHM .11 amps 110V (110 mA) = 1,000 OHM

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.

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