High Voltage Symbol

High Voltage Symbol Danger High Voltage Stickers-Electricity Health and Safety Warning Symbol Signs

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High Voltage Symbol

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Background Electrical high voltage warning symbol. Electrical high voltage warning symbol. Other injuries can include burns from the arc generated by the accidental contact.

These burns can be especially dangerous if the victim's airway is affected. Injuries may also be suffered as a result of the physical forces experienced by people who fall from a great height or are thrown a considerable distance.

Low-energy exposure to high voltage may be harmless, such as the spark produced in a dry climate when touching a doorknob after walking across a carpeted floor.

The voltage can be in the thousand-volt range, but the average current is low. The standard precautions to avoid injury include working under conditions that would avoid having electrical energy flow through the body, particularly through the heart region, such as between the arms, or between an arm and a leg.

Electricity can flow between two conductors in high voltage equipment and the body can complete the circuit. To avoid that from happening, the worker should wear insulating clothing such as rubber gloves, use insulated tools, and avoid touching the equipment with more than one hand at a time.

An electrical current can also flow between the equipment and the earth ground. To prevent that, the worker should stand on an insulated surface such as on rubber mats.

Safety equipment is tested regularly to ensure it is still protecting the user. Test regulations vary according to country.

Testing companies can test at up , volts and offer services from glove testing to Elevated Working Platform or EWP testing. Contact with or close approach to line conductors presents a danger of electrocution.

Contact with overhead wires can result in injury or death. Metal ladders, farm equipment, boat masts, construction machinery, aerial antennas , and similar objects are frequently involved in fatal contact with overhead wires.

Unauthorized persons climbing on power pylons or electrical apparatus are also frequently the victims of electrocution.

Digging into a buried cable can also be dangerous to workers at an excavation site. Digging equipment either hand tools or machine driven that contacts a buried cable may energize piping or the ground in the area, resulting in electrocution of nearby workers.

A fault in a high-voltage transmission line or substation may result in high currents flowing along the surface of the earth, producing an earth potential rise that also presents a danger of electric shock.

For high voltage and extra-high voltage transmission lines, specially trained personnel use " live line " techniques to allow hands-on contact with energized equipment.

In this case the worker is electrically connected to the high-voltage line but thoroughly insulated from the earth so that he is at the same electrical potential as that of the line.

Since training for such operations is lengthy, and still presents a danger to personnel, only very important transmission lines are subject to maintenance while live.

Outside these properly engineered situations, insulation from earth does not guarantee that no current flows to earth—as grounding or arcing to ground can occur in unexpected ways, and high-frequency currents can burn even an ungrounded person.

Touching a transmitting antenna is dangerous for this reason, and a high-frequency Tesla coil can sustain a spark with only one endpoint.

Protective equipment on high-voltage transmission lines normally prevents formation of an unwanted arc, or ensures that it is quenched within tens of milliseconds.

Electrical apparatus that interrupts high-voltage circuits is designed to safely direct the resulting arc so that it dissipates without damage.

High voltage circuit breakers often use a blast of high pressure air, a special dielectric gas such as SF 6 under pressure , or immersion in mineral oil to quench the arc when the high voltage circuit is broken.

Wiring in equipment such as X-ray machines and lasers requires care. The high voltage section is kept physically distant from the low voltage side to reduce the possibility of an arc forming between the two.

To avoid coronal losses, conductors are kept as short as possible and free of sharp points. If insulated, the plastic coating should be free of air bubbles which result in coronal discharges within the bubbles.

A high voltage is not necessarily dangerous if it cannot deliver substantial current. Despite electrostatic machines such as Van de Graaff generators and Wimshurst machines producing voltages approaching one million volts, they deliver a brief sting.

That is because the current is low, e. The discharge may involve extremely high voltage over very short periods, but to produce heart fibrillation, an electric power supply must produce a significant current in the heart muscle continuing for many milliseconds , and must deposit a total energy in the range of at least millijoules or higher.

Relatively high current at anything more than about fifty volts can therefore be medically significant and potentially fatal. During the discharge, these machines apply high voltage to the body for only a millionth of a second or less.

So a low current is applied for a very short time, and the number of electrons involved is very small. Despite Tesla coils superficially appearing similar to Van de Graaff generators, they are not electrostatic machines and can produce significant radio frequency currents continuously.

The current supplied to a human body will be relatively constant as long as contact is maintained, unlike with electrostatic machines which generally take longer to build up charges, and the voltage will be much higher than the break-down voltage of human skin.

As a consequence, the output of a Tesla coil can be dangerous or even fatal. Depending on the prospective short-circuit current available at a switchgear line-up, a hazard is presented to maintenance and operating personnel due to the possibility of a high-intensity electric arc.

Maximum temperature of an arc can exceed 10, kelvins , and the radiant heat, expanding hot air, and explosive vaporization of metal and insulation material can cause severe injury to unprotected workers.

Such switchgear line-ups and high-energy arc sources are commonly present in electric power utility substations and generating stations, industrial plants and large commercial buildings.

In the United States, the National Fire Protection Association , has published a guideline standard NFPA 70E for evaluating and calculating arc flash hazard , and provides standards for the protective clothing required for electrical workers exposed to such hazards in the workplace.

Even voltages insufficient to break down air can supply enough energy to ignite atmospheres containing flammable gases or vapours, or suspended dust.

Examples of industrial facilities with hazardous areas are petrochemical refineries, chemical plants , grain elevators , and coal mines.

In recent years, standards for explosion hazard protection have become more uniform between European and North American practice.

The "zone" system of classification is now used in modified form in U. Intrinsic safety apparatus is now approved for use in North American applications.

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High Voltage Symbol Video

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Old high voltage sign. Yellow triangle on a blue rusty door. Equipment and conductors that carry high voltage warrant particular safety requirements and procedures.

In certain industries, high voltage means voltage above a particular threshold see below. High voltage is used in electrical power distribution , in cathode ray tubes , to generate X-rays and particle beams , to demonstrate arcing , for ignition, in photomultiplier tubes , and in high power amplifier vacuum tubes and other industrial, military and scientific applications.

The numerical definition of high voltage depends on context. Two factors considered in classifying a voltage as high voltage are the possibility of causing a spark in air, and the danger of electric shock by contact or proximity.

The definitions may refer to the voltage between two conductors of a system, or between any conductor and ground.

In electric power transmission engineering, high voltage is usually considered any voltage over approximately 35, volts.

This is a classification based on the design of apparatus and insulation. This is in the context of building wiring and the safety of electrical apparatus.

There are no definitions relating to high voltage. The NEC covers voltages up to volts. Electricians may only be licensed for particular voltage classes in some jurisdictions.

Voltages over approximately 50 volts can usually cause dangerous amounts of current to flow through a human being who touches two points of a circuit—so safety standards, in general, are more restrictive around such circuits.

The definition of extra-high voltage EHV again depends on context. In electric power transmission engineering, EHV is classified as voltages in the range of , - , volts.

The accelerating voltage for a television cathode ray tube may be described as extra-high voltage or extra-high tension EHT , compared to other voltage supplies within the equipment.

In digital electronics , a high voltage usually refers to something representing a logic 1 in positive logic and a logic 0 in negative logic.

Electrostatic generators such as Van de Graaff generators and Wimshurst machines can produce voltages approaching one million volts, but typically produce low currents.

Induction coils operate on the flyback effect resulting in voltages greater than the turns ratio multiplied by the input voltage.

They typically produce higher currents than electrostatic machines, but each doubling of desired output voltage roughly doubles the weight due to the amount of wire required in the secondary winding.

Thus scaling them to higher voltages by adding more turns of wire can become impractical. The Cockcroft-Walton multiplier can be used to multiply the voltage produced by an induction coil.

It generates DC using diode switches to charge a ladder of capacitors. Tesla coils utilize resonance, are lightweight, and do not require semiconductors.

The largest scale sparks are those produced naturally by lightning. A negative lightning strike typically lasts for only tens of microseconds, but multiple strikes are common.

A positive lightning stroke is typically a single event. However, the larger peak current may flow for hundreds of milliseconds, making it considerably more energetic than negative lightning.

Strong electric fields from high voltages applied to small or pointed conductors often produce violet-colored corona discharges in air, as well as visible sparks.

Voltages below about — volts cannot produce easily visible sparks or glows in air at atmospheric pressure, so by this rule these voltages are "low".

However, under conditions of low atmospheric pressure such as in high-altitude aircraft , or in an environment of noble gas such as argon or neon , sparks appear at much lower voltages.

While lower voltages do not, in general, jump a gap that is present before the voltage is applied, interrupting an existing current flow with a gap often produces a low-voltage spark or arc.

As the contacts are separated, a few small points of contact become the last to separate. The current becomes constricted to these small hot spots , causing them to become incandescent, so that they emit electrons through thermionic emission.

Even a small 9 V battery can spark noticeably by this mechanism in a darkened room. The ionized air and metal vapour from the contacts form plasma, which temporarily bridges the widening gap.

If the power supply and load allow sufficient current to flow, a self-sustaining arc may form. Once formed, an arc may be extended to a significant length before breaking the circuit.

Attempting to open an inductive circuit often forms an arc, since the inductance provides a high-voltage pulse whenever the current is interrupted.

AC systems make sustained arcing somewhat less likely, since the current returns to zero twice per cycle.

The arc is extinguished every time the current goes through a zero crossing , and must reignite during the next half-cycle to maintain the arc.

Unlike an ohmic conductor, the resistance of an arc decreases as the current increases. This makes unintentional arcs in an electrical apparatus dangerous since even a small arc can grow large enough to damage equipment and start fires if sufficient current is available.

Electrical transmission and distribution lines for electric power typically use voltages between tens and hundreds of kilovolts.

The lines may be overhead or underground. High voltage is used in power distribution to reduce ohmic losses when transporting electricity long distance.

It is used in the production of semiconductors to sputter thin layers of metal films on the surface of the wafer. It is also used for electrostatic flocking to coat objects with small fibers that stand on edge.

Spark gaps were used historically as an early form of radio transmission. Similarly, lightning discharges in the atmosphere of Jupiter are thought to be the source of the planet's powerful radio frequency emissions.

High voltages have been used in landmark chemistry and particle physics experiments and discoveries.

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