Abstract: Covering every major electrical standard, including NEC, NESC, NFPA, 70E, IEEE , and OSHA, Electrical Safety Handbook, Fourth Edition is a. Electrical Workers' Safety Handbook. 4. CONTENTS. 6 About This Handbook. 8 Conduct and Professionalism. OSHA Guidelines for a Safe Workplace. This DOE Electrical Safety Handbook replaces the DOE Electrical Safety other electrical codes and standards utilized in this handbook include: 29 CFR
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This Electrical Safety Hazards Handbook was developed for general education purposes only and Use the information within this Handbook at your own risk. Chapter 2. Electrical Safety Equipment. Introduction / Glossary / General Inspection and Testing Requirements for Electrical. Safety Equipment / ELECTRICAL SAFETY HAZARDS HANDBOOK The World's Leading Provider of Circuit Protection Solutions Littelfuse is the global leader in circuit protection A.
This must-have guide provides the most current safety strategies for use in industrial, commercial, and home-office electrical systems in an easy-to-use format. Written by experts in electrical operations, maintenance, engineering, construction, and safety, this fully revised edition delivers complete details on: Hazards of electricity Basic physics of electrical hazards Electrical safety equipment Grounding and bonding of electrical systems and equipment Electrical maintenance and its relationship to safety Regulatory and legal safety requirements and standards Accident prevention, accident investigation, rescue, and first aid Low-voltage safety Human factors in electrical safety Safety management and organizational structure Safety training methods and systems John Cadick, P. He has specialized for more than three decades in electrical engineering, training, and management. Mary Capelli-Schellpfeffer, M. Dennis K. Neitzel, C. Al Winfield, of the Cadick Corporation, has more than three decades of electrical power experience, having conducted more than 4, Electrical Safe Work Practices Seminars.
If you are unsure whether you qualify to act in a role of the second person, then consult your supervisor.
He or she is responsible for assuring each person's qualifications, and will assign one person to do the work and the other to be the backup.
Extension Cords Damaged and improperly used extension cords cause thousands of electrical fires and injuries in homes and workplaces every year. Before using extension cords, inspect them for cracks, ripped insulation, and damaged or missing grounding prongs.
Do not bend back or break off grounding prongs: they are important safety features that receive harmful stray currents. To prevent overheating or possible electrical shock, choose cords rated for current levels that exceed your needs by a safe margin.
Never run extension cords through walls, windows, or doorways or behind walls, ceilings, or floors. Never connect extension cords in a series or splice them together. Remove the extension cord when you are finished. Extension cords are not to become permanent fixtures for regular use. Gloves may be required however, do not wear gloves when you are operating a revolving tool, such as a drill or saw.
Safety glasses prescription and non-prescription and boots or shoes of many types are also available with download orders from the business office. Wear appropriate personal protective equipment when you are working with power tools, electricity of 50 volts or greater, or heavy equipment.
Remember that watches and rings can cause fatal injury by acting as conductors. Remove all jewelry when you are working with power tools or near electrical hazards. Collapse Know Your Equipment Know Your Equipment Before beginning electrical work, check that your diagnostic equipment is in good working order, is properly calibrated, and covers the range necessary for the job.
A small, hand-held digital voltage meter DVM is commonly used, but you must check the rating on the front of the DVM to ensure that the voltage with which you are working is under the meter's maximum rating.
It is dangerous to use a meter on voltages that exceed its maximum rating. Use proper testing equipment and accessories when repairing AC or DC powered equipment. Choose probes and modules carefully because they are rated for different peak voltages. Remember that peak AC voltage is about one and a half times the normally quoted RMS root mean square voltage. If you are unsure of which probe to choose for the equipment you are planning to work on, then you should use a DVM with a rating higher than the highest possible voltage in the equipment you are working on to measure the voltage first.
When you are in damp or wet areas, you must power line-operated equipment through a ground fault circuit interrupter GFCI. Test each GFCI before using it. Portable GFCIs are available from technical supervisors. Before bench-testing a line-operated chassis, bond metal test benches to the ground and use a circuit breaker to ensure that the current is limited.
A ground-fault circuit interupter may provide additional protection. You may also need a second person with you to satisfy the two-person rule. Before testing or working on high voltage equipment or equipment capable of energy storage, note any posted warnings and then de-energize it with a grounding stick. The grounding stick, a metal wand with an insulated handle, is normally built in where needed near outputs of DC power supplies, filter capacitors, etc. Always disconnect the energy at its source before using a grounding stick, and, if possible, dissipate any stored energy.
Be prepared to encounter stored energy when using a grounding stick. Moreover, abnormal conditions e.
For DC voltages, currents above 25 mA at 50 V are considered hazardous under normal conditions. For common AC outlets 60 Hz, V , current above 10 mA is considered hazardous under normal conditions.
The health consequences of contact with common household outlet V, 60 hertz AC current, under normal conditions, versus current in milliAmperes, or mA can include: 1 mA: Usually harmless, but slight tingling or involuntary movement from the shock can cause injury. Possible loss of muscle control. In addition to risks of restricted respiration, cardiac arrest, and internal organ damage, conducting high currents through the skin can leave severe burns.
It is always prudent to use one or more safeguards such as wearing appropriate protective equipment, or de-energizing a circuit before working on it if the hazard level is uncertain.
However, if the 50 V level is exceeded, or abnormal conditions prevail, the use of safeguards is required, as is specialized training. Another hazard of some electrical equipment is that of "arc flash". An arc flash occurs when an unintended low impedance current path becomes available to a circuit capable of supplying high current, and results in an explosion which blasts molten metal and an expanding plasma with great force and extremely high temperatures.
Serious injury and death can occur for anyone in the vicinity of an arc flash, especially if appropriate protective equipment is not worn. An arc-flash hazard may exist at some AC power distribution panels, with the danger being highest for higher voltages and power capabilities.
Specialized training is necessary to work in the vicinity of any arc-flash hazard. Good Housekeeping Poor housekeeping is the main reason that electricity is the number one cause of fires in the workplace nationwide. Although safety features such as circuit breakers, ground fault circuit interrupters , and insulators are designed to prevent electricity from becoming the heat source for fires, poor housekeeping may still cause a fire.
Good housekeeping requires that you: Clean up liquid spills near electrical equipment immediately and be sure that electrical equipment is thoroughly dry before applying power Store flammable liquids away from electrical equipment Keep electrical cords away from heat sources Do not overload outlets Do not plug a power strip into another power strip Keep paths to fire extinguishers clear Keep your work area neat and clean to protect yourself and your co-workers from fire hazards, but remember your own safety depends on good housekeeping throughout the lab.
If you see faulty equipment or poor housekeeping anywhere in the lab, please report it immediately. Two-Person Rule Never work alone when you could be exposed to hazardous voltages above 50V or current above 25 mA. A second person must stand as a backup. The backup person must be in the immediate area and attentive to the work in progress.
He or she must know both where to shut off power and how to call for help. If you are unsure whether you qualify to act in a role of the second person, then consult your supervisor. He or she is responsible for assuring each person's qualifications, and will assign one person to do the work and the other to be the backup.
Extension Cords Damaged and improperly used extension cords cause thousands of electrical fires and injuries in homes and workplaces every year. Before using extension cords, inspect them for cracks, ripped insulation, and damaged or missing grounding prongs. Do not bend back or break off grounding prongs: they are important safety features that receive harmful stray currents. To prevent overheating or possible electrical shock, choose cords rated for current levels that exceed your needs by a safe margin.
Never run extension cords through walls, windows, or doorways or behind walls, ceilings, or floors. Never connect extension cords in a series or splice them together.
Remove the extension cord when you are finished. Extension cords are not to become permanent fixtures for regular use. Gloves may be required however, do not wear gloves when you are operating a revolving tool, such as a drill or saw.