Electrical Safety Handbook, 4th Edition by John Cadick, Mary Capelli-Schellpfeffer, Dennis Neitzel, Al

By John Cadick, Mary Capelli-Schellpfeffer, Dennis Neitzel, Al Winfield

Up to date, ON-THE-JOB electric defense ESSENTIALS
Covering each significant electric usual, together with NEC, NESC, NFPA, 70E, IEEE 1584, and OSHA, electric safeguard instruction manual, Fourth version is a realistic, illustrated resource of life-saving details designed for particular paintings environments. This must-have advisor offers the most up-tp-date safeguard ideas to be used in business, advertisement, and home-office electric structures in an easy-to-use structure. Written by means of specialists in electric operations, upkeep, engineering, building, and defense, this absolutely revised variation supplies whole information on:
Hazards of electricity
Basic physics of electric hazards
Electrical security equipment
Safety approaches and methods
Grounding and bonding of electric platforms and equipment
Electrical upkeep and its courting to safety
Regulatory and criminal security specifications and standards
Accident prevention, twist of fate research, rescue, and primary aid
Low-voltage safety
Medium- and high-voltage safety
Human components in electric safety
Safety administration and organizational structure
Safety education equipment and platforms

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Additional info for Electrical Safety Handbook, 4th Edition

Example text

The electric impulses in the heart must be coordinated to give a smooth, rhythmic beat. An outside current of as little as 60 to 75 mA can disturb the nerve impulses so that there is no longer a smooth, timed heartbeat. Instead, the heart fibrillates—that is, it beats in a rapid, uncoordinated manner. When a heart is fibrillating, it flutters uselessly. Prolonged exposure to an outside current exceeding 75 mA is likely to result in death. Like any muscle, the heart will become paralyzed if the current flowing through it is of sufficient magnitude.

While we may not think of our bodies as behaving like a roll of copper or aluminum electrical cable, as is true for these metals, the human body is a good conductor of electrical charges. In copper and aluminum, electrical charge is carried by electrons. In the human body, charge moves via ions like sodium, potassium, and chloride. Charge movement can cause heating. Some tissues in the body are especially adept at ion charge movements. We call these tissues excitable. In particular, our sense organs, muscles, nervous system, and heart are excitable tissues.

When the lower diaphragm moves down, it creates a partial vacuum in the chest chamber. 23 in the lungs. The oxygen is then passed to the bloodstream through the tiny capillaries. At the same time, carbon dioxide is returned to the air in the lungs. When the lower diaphragm moves up, the air is forced out of the lungs, thus completing the breathing cycle. â•… Current flow through the midsection of the body can disrupt the nervous system impulses that regulate the breathing function. This disruption can take the form of irregular, sporadic breathing, or—if the current flow is sufficient—the pulmonary system may be paralyzed altogether.

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