specific+properties

Let us take the specific case of the Earth and the Moon.

With the particular (or specific) construction shown in Fig. 16, air filters are always supplied.

The specific properties of any particular ionic compound depend on the individual component ions.

The maximum rate of change of a particular characteristic of the orbit...

The expansion should be allowed for in the die design for each specific (or concrete) application.

Let us take the specific case of the Earth and the Moon.

With the particular (or specific) construction shown in Fig. 16, air filters are always supplied.

The specific properties of any particular ionic compound depend on the individual component ions.

The maximum rate of change of a particular characteristic of the orbit...

The expansion should be allowed for in the die design for each specific (or concrete) application.

неотъемлемое / присущее свойство — integral part

специфические свойства — specific properties

Specific gravity of a liquid may be related directly to [or associated (or connected) directly with] its significant properties.

Specific gravity of a liquid may be related directly to [or associated (or connected) directly with] its significant properties.

(длительный) допустимый ток
Максимальное значение электрического тока, который может протекать длительно по проводнику, устройству или аппарату при определенных условиях без превышения определенного значения их температуры в установившемся режиме
[ ГОСТ Р МЭК 60050-826-2009]

Этот ток обозначают I_Z
[ ГОСТ Р 50571. 1-2009 ( МЭК 60364-1: 2005)]

EN

(continuous) current-carrying capacity
ampacity (US)
maximum value of electric current which can be carried continuously by a conductor, a device or an apparatus, under specified conditions without its steady-state temperature exceeding a specified value
[IEV number 826-11-13]

ampacity
The current in amperes that a conductor can carry continuously under the conditions of use without exceeding its temperature rating.
[National Electrical Cod]

FR

courant (permanent) admissible, m
valeur maximale du courant électrique qui peut parcourir en permanence, un conducteur, un dispositif ou un appareil, sans que sa température de régime permanent, dans des conditions données, soit supérieure à la valeur spécifiée
[IEV number 826-11-13]

Ampacity, the term is defined as the maximum amount of current a cable can carry before sustaining immediate or progressive deterioration. Also described as current rating or current-carrying capacity, is the RMS electric current which a device can continuously carry while remaining within its temperature rating. The ampacity of a cable depends on:

• its insulation temperature rating;
• conductor electrical properties for current;
• frequency, in the case of alternating currents;
• ability to dissipate heat, which depends on cable geometry and its surroundings;
• ambient temperature.

Electric wires have some resistance, and electric current flowing through them causes voltage drop and power dissipation, which heats the cable. Copper or aluminum can conduct a large amount of current before melting, but long before the conductors melt, their insulation would be damaged by the heat.

The ampacity for a power cable is thus based on physical and electrical properties of the material & construction of the conductor and of its insulation, ambient temperature, and environmental conditions adjacent to the cable. Having a large overall surface area may dissipate heat well if the environment can absorb the heat.

In a long run of cable, different conditions govern, and installation regulations normally specify that the most severe condition along the run governs the cable's rating. Cables run in wet or oily locations may carry a lower temperature rating than in a dry installation. Derating is necessary for multiple circuits in close proximity. When multiple cables are near, each contributes heat to the others and diminishes the amount of cooling air that can flow past the individual cables. The overall ampacity of the insulated conductors in a bundle of more than 3 must be derated, whether in a raceway or cable. Usually the de-rating factor is tabulated in a nation's wiring regulations.

Depending on the type of insulating material, common maximum allowable temperatures at the surface of the conductor are 60, 75 and 90 degrees Celsius, often with an ambient air temperature of 30°C. In the U.S., 105°C is allowed with ambient of 40°C, for larger power cables, especially those operating at more than 2 kV. Likewise, specific insulations are rated 150, 200 or 250°C.

The allowed current in cables generally needs to be decreased (derated) when the cable is covered with fireproofing material.

For example, the United States National Electric Code, Table 310-16, specifies that up to three 8 AWG copper wires having a common insulating material (THWN) in a raceway, cable, or direct burial has an ampacity of 50 A when the ambient air is 30°C, the conductor surface temperature allowed to be 75°C. A single insulated conductor in air has 70 A rating.

Ampacity rating is normally for continuous current, and short periods of overcurrent occur without harm in most cabling systems. The acceptable magnitude and duration of overcurrent is a more complex topic than ampacity.

When designing an electrical system, one will normally need to know the current rating for the following:

• Wires
• Printed Circuit Board traces, where included
• Fuses
• Circuit breakers
• All or nearly all components used

Some devices are limited by power rating, and when this power rating occurs below their current limit, it is not necessary to know the current limit to design a system. A common example of this is lightbulb holders.

[http://en.wikipedia.org/wiki/Ampacity]

Тематики

• электротехника, основные понятия

Синонимы

• длительно допустимый ток
• допустимый ток

EN

• ampacity (US)
• continuous current
• continuous current-carrying capacity
• current-carrying capacity

DE

• Dauerstrombelastbarkeit, f
• Strombelastbarkeit, f

FR

• courant admissible, m
• courant permanent admissible, m

In order to explain..., one must draw on the principles of quantum mechanics.

The designer must fall back on semiempirical numerical methods of analysis.

Pascal invoked the principle of indifference by referring to a coin flip in his famous wager.

Recourse was made (or We resorted) to a propulsion unit incorporating...

To take advantage of the higher potential,…

This multiplexing provides more input channels but at a sacrifice in (or at the sacrifice of) frequency response of each channel.

The thrust is increased at the cost (or penalty) of an increase in specific fuel consumption.

Ethylene production increases at the expense of the higher molecular weight olefins.

Such power has not been obtained at the expense (or sacrifice) of reliability.

Losses through evaporation are regarded as trifling.

Increasing the chromium content results in improved corrosion resistance to scaling, but with some sacrifice in other properties.

These particles can have only certain energies.

Any particular layer always contains distinctive fossils.

Each absorption band is associated with a distinct (or definite) type of electrical oscillator.

Each of the materials comprising the Earth's surface has distinct elastic properties.

A counter may be located at a fixed (or set) distance from the source.

The maximum rate of change of a particular characteristic of the orbit...

Apparatus suitable for specific test methods...

The conveyor feeds a specified amount of coal into...

The combination of so many properties is difficult to achieve (or attain, or realize).

Consolidation of powder is most commonly brought about by hot pressing.

These operations were often carried on simultaneously.

This survey is being conducted by...

All operations will be perfor med (or completed) on time.

The new plan was put into effect.

Similar experiments will be run (or carried out, or performed) in our laboratory.

Machining is completed in one chucking ( за одну установку в патроне).

Such communication links should be easily realized.

Preparation of 2,3-butanediol has been by fermentation.

Activity or concentration gradient is employed to effect (or accomplish) mass transfer between two phases.

One method of arranging head-on collisions is to build two storage rings that...

These reactants effect oxidation.

Specific halogenation can be made to occur in sunlight...

Quantitative analysis is practised by every analytical laboratory.

Such measures were ultimately effectuated.

Such problems are inherent in (or characteristic of, or typical for) high-altitude, hypersonic flights.

A simple behaviour is shown by systems for which...

The infrared spectrum is characteristic of the entire molecule.

The use of a colour change to indicate... is common to a wide variety of titrimetric methods.

The DNA transcriptive properties are intrinsic to the enzyme.

This enzyme is specific to liver disease.

This multiplexing provides more input channels but at a sacrifice in (or at the sacrifice of) frequency response of each channel.

The thrust is increased at the cost (or penalty) of an increase in specific fuel consumption.

Ethylene production increases at the expense of the higher molecular weight olefins.

Such power has not been obtained at the expense (or sacrifice) of reliability.

Losses through evaporation are regarded as trifling.

Increasing the chromium content results in improved corrosion resistance to scaling, but with some sacrifice in other properties.