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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

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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
OHM’S LAW

I= E/R

E= Voltage I= Current R= Resistance

(volts) (amperes) (OHMS)

fatalities have occurred at 50 volts or less
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
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
Human Resistance

Body AreaResistance (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
So How Do We Protect Ourselves?
  • Effective Grounding.
  • Electrical Protective Devices.
  • Insulation and Guarding of Live Parts.
  • Inspection & Maintenance.
  • Training.
protective measures
PROTECTIVE MEASURES
  • Equipment Grounding.
  • Fuses and Circuit Breakers.
  • Ground Fault Circuit Interrupters (GFCI).
  • Double Insulated Tools.
  • Wire Insulation.
flexible cords extension cords
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
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
Groups, continued
  • Safety Related Work Practices:
    • Protection of Employees
    • Passageways and Open Spaces
    • Lockout and Tagging of Circuits
groups continued11
Groups, continued
  • Safety Related Maintenance and Environmental Considerations:
    • Maintenance of Equipment
    • Environmental Deterioration of Equipment
groups continued12
Groups, continued
  • Safety Requirements for Special Equipment:
    • Batteries
    • Battery Charging
other considerations
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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