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

4. Effects of Current 8-15 mA= Pain.
15-20 mA = Pain & muscle contraction.
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 Area Resistance (OHMS)
Dry Skin 100,000 to 600,000
Wet Skin 1,000
Internal Body
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)