Download 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
(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”
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•
•
•
•
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:
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–
–
–
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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–
–
–
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405(a)(2)(ii)(E)
405(a)(2)(ii)(F)
405(a)(2)(ii)(G)
405(a)(2)(ii)(J)