-
1 permanent air
Большой англо-русский и русско-английский словарь > permanent air
-
2 permanent air
-
3 permanent air crossing
Большой англо-русский и русско-английский словарь > permanent air crossing
-
4 permanent air crossing
English-Russian dictionary of geology > permanent air crossing
-
5 permanent air crossing
-
6 permanent air bleed
Техника: постоянное удаление воздуха -
7 permanent air crossing
Горное дело: капитальный вентиляционный мостУниверсальный англо-русский словарь > permanent air crossing
-
8 permanent air crossing
English-Russian scientific dictionary > permanent air crossing
-
9 permanent
1) долговременный
2) непреходящий
3) нерасходуемый
4) постоянный
5) перманентный
6) бессрочный
7) длящийся
8) остаточный
9) прочный
– permanent air
– permanent air crossing
– permanent airdrome
– permanent ballast
– permanent coupling
– permanent echo
– permanent expansion
– permanent gas
– permanent lining
– permanent load
– permanent loop
– permanent magnet
– permanent magnetism
– permanent mask
– permanent memory
– permanent trench
– permanent twist
– permanent way division
– permanent way equipment
– permanent working
permanent catalyst poisoning — постоянное отравление катализа
permanent magnet generator — генератор с постоянными магнитами
-
10 air
1) воздух
2) вентиляционный
3) воздухоспускный
4) пневматичееский
5) пневматический
6) проветривать
7) сборный
8) <aeron.> авиа-
9) воздушный
10) отбойный
11) дроссельный
– access for air
– actuating air
– admit air
– air ambulance
– air analyzer
– air bag
– air balance
– air base
– air bath
– air beacon
– air binder
– air blast
– air blasting
– air bleed valve
– air bleeder
– air blower
– air bluing
– air box
– air breaking
– air bumper
– air calcination
– air capacitor
– air celestial navigation
– air cell
– air change
– air choke
– air circulation
– air classifier
– air classifying
– air cleaning
– air compressor
– air conditioning
– air cooler
– air cooling
– air crossing
– air curtain
– air cushion
– air damper
– air dash-pot
– air distance recorder
– air distributor
– air door
– air drag
– air draught
– air drier
– air duct
– air ejector condenser
– air entrapment
– air evacuation line
– air filter
– air flow classifier
– air freshener
– air gap
– air gauge
– air hardening
– air heading
– air heater
– air hoist
– air insulation
– air intake
– air jet
– air jigging
– air launching
– air line
– air load
– air lock
– air manifold
– air marker
– air mass
– air medical service
– air meteorological service
– air moisture
– air motor
– air navigation
– air outlet
– air partition
– air passage
– air pipe
– air pit
– air pocket
– air pollution
– air preheater
– air pump
– air purification
– air quality
– air raise
– air refrigerating machine
– air route
– air rudder
– air scale
– air scoop
– air scraper
– air scrubbing
– air separation
– air servicer
– air show
– air shrinkage
– air sickness
– air slaking
– air space
– air stain
– air start
– air supply
– air swinging
– air tightness
– air traffic
– air traffic control
– air traffic controller
– air transport
– air tuyere
– air uptake
– air valve
– air wave
– ambient air
– ascending air
– automatic air regulator
– auxiliary air
– blast-furnace air
– bleed air
– carburetted air
– carriage by air
– carrier air
– combustion air
– compressed air
– compressed air hammer
– compressed air locomotive
– conditioned air
– control air
– cooling air
– cycle air
– damp air
– deliver by air mail
– district air crossing
– ducted air intake
– dusty air
– entrain air
– entrap air
– entrapped air
– evacuate air from
– excess air
– excess air coefficient
– excess air ratio
– exhaust air
– extensive air shower
– foul air
– free air
– fresh air
– gas-heated air heater
– gilled air heater
– go on the air
– ground-based air navigation
– heated air ventilation
– hot air header
– hydraulic air compressor
– induced air
– inducted air
– injection air
– inleakage of air
– ionized air
– large-scale air current
– liquid air
– main air intake
– major air route
– mine air
– multipass air heater
– oil bath air cleaner
– outdoor air
– overfire air
– oxygen-enriched air
– ozonized air
– permanent air
– permanent air crossing
– plate air heater
– plate-fin air preheater
– polluted air
– precompressed air
– preheated air
– primary air
– pure air
– purified air
– rarefied air
– recuperative air cooler
– regenerative air cooler
– return air
– rough air
– saturated air
– sealing air
– self-contained air conditioner
– ship by air freight
– single-pass air heater
– single-stage air heater
– soil air
– split-flow air heater
– spray air cooler
– stagnant air
– standard air
– starting air
– still air
– still air freezing
– suction air duct
– tempering air damper
– tempering air valve
– three-pass air heater
– travel by air
– true air
– turbulent air
– two-stage air heater
– underground air
– unfeather air screw
– used air
– vulcanization in air
– vulcanize in air
compressed air operated fan — вентилятор с пневматическим привод
maritime moderate air — <meteor.> воздух умеренный морской
scale distance of air base — <phot.> базис фотографирования в масштабе аэроснимка, базис фотографирования в масштабе стереомодели
-
11 unoccupied and uncultivated landscape of the glacier surface devoid of vegetation on account of permanent low air temperatures
Общая лексика: пустынный ландшафт поверхности ледников, характеризующийся постоянными низкими температурами воздуха и отсутствием раститеУниверсальный англо-русский словарь > unoccupied and uncultivated landscape of the glacier surface devoid of vegetation on account of permanent low air temperatures
-
12 капитальный вентиляционный
Большой англо-русский и русско-английский словарь > капитальный вентиляционный
-
13 капитальный вентиляционный мост
Большой англо-русский и русско-английский словарь > капитальный вентиляционный мост
-
14 crossing
1) переезд
2) кроссинг
3) перекрещивание
4) скрещивающийся
5) переход
6) перевал
7) перекрещивающийся
8) пересекающийся
9) скрещивание
10) пересечение
– air crossing
– crossing of rolls
– crossing out
– district air crossing
– level crossing
– permanent air crossing
– railway crossing
grade crossing signal — < railways> сигнал переездный
grade crossing signals — < railways> сигнализация переездная
-
15 crossing
1) переход; переезд2) перевал3) геол. брод, перекат4) перекрещивание || перекрещивающийся; пересекающийся5) пересечение6) скрещивание || скрещивающийся•crossing out — вычёркивание, уничтожение, удаление
-
16 Defense
оборона, защита; pl. оборона, система обороны; оборонительные сооруженияapproach the (enemy) defenses — подходить к району обороны (противника);
put up a (stout) defense — оказывать (упорное) сопротивление, стойко оборонять(ся);
— all-around defense— antiamphibious assault defense— chemical warfare defense— close-in defense— endoatmospheric missile defense— extended position defense— general air defense— hillside defense— national wide defense— positional defense— zero air defense* * * -
17 defense
оборона, защита; pl. оборона, система обороны; оборонительные сооруженияapproach the (enemy) defenses — подходить к району обороны (противника);
put up a (stout) defense — оказывать (упорное) сопротивление, стойко оборонять(ся);
— all-around defense— antiamphibious assault defense— chemical warfare defense— close-in defense— endoatmospheric missile defense— extended position defense— general air defense— hillside defense— national wide defense— positional defense— zero air defense* * *1) оборона; 2) оборона -
18 equipment
1) оборудование; оснащение; аппаратура, аппаратные средства; арматура2) армировка ( шахтного ствола)3) ж.-д. подвижной состав4) снаряжение•to abuse an equipment — неквалифицированно обращаться с оборудованием-
turn-key pattern equipment
-
accessory starting equipment
-
aerial equipment
-
aeronautical equipment
-
aerospace ground equipment
-
agglomeration equipment
-
air brake equipment
-
airborne direction finding equipment
-
airborne electronics equipment
-
airborne equipment
-
airborne identification equipment
-
airborne weather equipment
-
air-cleaning equipment
-
air-conditioning equipment
-
aircraft equipment
-
aircraft recorder equipment
-
air-handling equipment
-
air-insulated equipment
-
air-processing equipment
-
airslide equipment
-
air-survey equipment
-
alignment equipment
-
analog equipment
-
ancillary equipment
-
answering equipment
-
area navigation equipment
-
associated-gas handling equipment
-
atmospheric heat-transfer equipment
-
audio equipment
-
automatic control equipment
-
automatic insertion equipment
-
automatic stabilization equipment
-
automatic test equipment
-
auxiliary equipment
-
backup equipment
-
ballasting equipment
-
batch-preparation equipment
-
bathroom-and-lavatory equipment
-
blasting equipment
-
blind flight equipment
-
block equipment
-
bookbinding equipment
-
brake equipment
-
bread-making equipment
-
bridling equipment
-
broadcasting equipment
-
broadcast equipment
-
brown stock washing equipment
-
built-in equipment
-
built-in test equipment
-
cable logging equipment
-
cab-signaling equipment
-
calling equipment
-
camp equipment
-
can-making equipment
-
canning equipment
-
caption-producing equipment
-
carburetor heat equipment
-
cast molding equipment
-
catering equipment
-
centrifugal air-conditioning equipment
-
charging equipment
-
check-out equipment
-
chemically-proof electrical equipment
-
chilling equipment
-
CMC equipment
-
coal-handling equipment
-
cockpit equipment
-
coding equipment
-
coil-handling equipment
-
coil-in-box equipment
-
coke-side equipment
-
cold-draw equipment
-
collision warning equipment
-
commercial equipment
-
commercial refrigeration equipment
-
common equipment
-
communication security equipment
-
communications equipment
-
communication equipment
-
commuter equipment
-
comparison equipment
-
component-insertion equipment
-
composing equipment
-
compound equipment
-
compression refrigeration equipment
-
compressor equipment
-
computer equipment
-
conning equipment
-
construction equipment
-
continuous fusing equipment
-
control equipment
-
cooking equipment
-
copying equipment
-
cord latex equipment
-
crane electrical equipment
-
crushing equipment
-
current collection equipment
-
customer premises equipment
-
data acquisition equipment
-
data terminal equipment
-
data transmission equipment
-
data-circuit terminating equipment
-
data-processing equipment
-
dead-reckoning equipment
-
deairing equipment
-
deck equipment
-
depositing equipment
-
detonating equipment
-
digital equipment
-
digital multiplex equipment
-
digital still-stare equipment
-
digital video equipment
-
display equipment
-
distance measuring equipment
-
distillation equipment
-
ditching equipment
-
domestic refrigeration equipment
-
doping equipment
-
downhole equipment
-
downstream equipment
-
drill stem equipment
-
drilling equipment
-
drilling mud handling equipment
-
drilling mud mixing equipment
-
drip-proof electrical equipment
-
dry-quenching equipment
-
dual laterolog equipment
-
dusting equipment
-
dustproof electrical equipment
-
dust-tight electrical equipment
-
earth-moving equipment
-
edge-strip scanning equipment
-
editing equipment
-
electric face equipment
-
electrical equipment
-
electrodialysis membrane equipment
-
electroheat equipment
-
electromagnetic exploration equipment
-
electronic countermeasures equipment
-
electronic equipment
-
emergency breathing equipment
-
emission-control equipment
-
engine-testing equipment
-
environmental simulation equipment
-
error-control equipment
-
evacuating equipment
-
excavating equipment
-
explosionproof electrical equipment
-
face equipment
-
facsimile equipment
-
farm equipment
-
field equipment
-
field-production equipment
-
film equipment
-
film-scanning equipment
-
finishing equipment
-
fire-extinguishing equipment
-
firing equipment
-
fishing equipment
-
fixed equipment
-
flame-hardening equipment
-
flameproof electrical equipment
-
flow head equipment
-
formation density equipment
-
fracturing head equipment
-
fuel-injection equipment
-
gas conditioning equipment
-
gas processing equipment
-
general-purpose equipment
-
glider launch equipment
-
glider tow equipment
-
government furnished equipment
-
grading equipment
-
graphic arts equipment
-
grinding-mixing equipment
-
ground-based electrical equipment
-
ground electrical equipment
-
harvesting equipment
-
hauling equipment
-
heat-exchange equipment
-
heat-transfer equipment
-
heavy-duty equipment
-
higher-horsepower equipment
-
high-maintenance equipment
-
high-performance equipment
-
high-pressure spray equipment
-
high-temperature head equipment
-
high-voltage equipment
-
hoisting equipment
-
home video equipment
-
horizontal-loop equipment
-
household equipment
-
humidity test equipment
-
hydraulic equipment
-
hygiene equipment
-
indoor electrical equipment
-
induced-polarization equipment
-
induced-polarization logging equipment
-
induction hardening equipment
-
induction log equipment
-
inductive heating equipment
-
industrial equipment
-
industrial-television equipment
-
inertial navigational equipment
-
ingot-forming equipment
-
in-line equipment
-
insertion equipment
-
inspection equipment
-
instrument-landing equipment
-
integral test equipment
-
intercity equipment
-
intercooling equipment
-
interlocking equipment
-
isophasing equipment
-
landing equipment
-
laser illumination tracking equipment
-
life saving equipment
-
lighting equipment
-
linear matting equipment
-
loading equipment
-
logging equipment
-
log-processing equipment
-
low-maintenance equipment
-
lumber-drying equipment
-
lumberman's equipment
-
machine-computer interfacing equipment
-
magnetic-tape equipment
-
magnetotelluric equipment
-
maintenance equipment
-
makeup equipment
-
manual test equipment
-
marine equipment
-
marine refrigeration equipment
-
materials handling equipment
-
MDI equipment
-
measuring equipment
-
mechanical refrigerating equipment
-
metering equipment
-
microfilm duplicating equipment
-
milling equipment
-
mine electrical equipment
-
mineral processing equipment
-
mine-rescue equipment
-
mining equipment
-
mixing equipment
-
mobile equipment
-
monitoring equipment
-
monophonic equipment
-
multidimension gaging equipment
-
multiplex equipment
-
navigation equipment
-
NC equipment
-
night vision equipment
-
night-flying equipment
-
nozzle-stopper equipment
-
office equipment
-
off-line equipment
-
oil field equipment
-
oil-dispensing equipment
-
on-line equipment
-
open-type electrical equipment
-
optional equipment
-
ore-handling equipment
-
outdoor electrical equipment
-
outside broadcasting equipment
-
overhead equipment
-
paper converting equipment
-
parts handling equipment
-
pass-through stretch wrapping equipment
-
payoff equipment
-
perforating equipment
-
peripheral equipment
-
permanent way equipment
-
phototypesetting equipment
-
photovoltaic equipment
-
Piggyback equipment
-
platemaking equipment
-
pneumatic equipment
-
portable electrical equipment
-
portable equipment
-
power equipment
-
power-conditioning equipment
-
powerhouse permanent equipment
-
printing equipment
-
process control equipment
-
processing equipment
-
production equipment
-
production run equipment
-
projection equipment
-
protected equipment
-
protection equipment
-
public address equipment
-
pusher-side equipment
-
quenching equipment
-
radar equipment
-
radio communication equipment
-
radio equipment
-
radio receiving equipment
-
radio transmitting equipment
-
radioactivity well logging equipment
-
rail brake equipment
-
railway equipment
-
ranging equipment
-
readout equipment
-
reciprocating air-conditioning equipment
-
reciprocating compression equipment
-
reference measuring equipment
-
reflection equipment
-
refraction equipment
-
refrigerating equipment
-
remote control equipment
-
residue recovery equipment
-
resistivity logging equipment
-
rigging equipment
-
round-trip equipment
-
running equipment
-
sawmill equipment
-
scrap-handling equipment
-
scrap-processing equipment
-
scrap-reclaiming equipment
-
sealed electrical equipment
-
security equipment
-
seismic exploration equipment
-
self-contained equipment
-
self-potential equipment
-
service equipment
-
setting equipment
-
shear knife changing equipment
-
shipboard equipment
-
shooting equipment
-
sign towing equipment
-
signal-conversion equipment
-
simple equipment
-
sinking equipment
-
slaughtering equipment
-
slicing equipment
-
slide equipment
-
small commercial refrigeration equipment
-
smoking equipment
-
snow handling equipment
-
solids control equipment
-
sonic equipment
-
sound equipment
-
spark-erosion equipment
-
special-effects equipment
-
special-purpose equipment
-
splashproof equipment
-
spray equipment
-
stand-alone equipment
-
standard equipment
-
standardization equipment
-
standby equipment
-
stationary equipment
-
stereophonic equipment
-
stereo equipment
-
stoplog handling equipment
-
stripping equipment
-
strip-storage equipment
-
studio-production equipment
-
studio equipment
-
stump-pulling equipment
-
stump-to-roadside equipment
-
submersible electrical equipment
-
subtitling equipment
-
supervisory equipment
-
surface equipment
-
surface hardening equipment
-
surface measuring equipment
-
survival equipment
-
switching equipment
-
talk-back equipment
-
telecine equipment
-
television automatic-monitoring equipment
-
television equipment
-
television field equipment
-
television relay equipment
-
television studio equipment
-
television-broadcasting equipment
-
television-film equipment
-
tensioning equipment
-
terminal equipment
-
testing equipment
-
test equipment
-
timing equipment
-
totally enclosed electrical equipment
-
tower equipment
-
track circuit equipment
-
trackside equipment
-
track equipment
-
tracking equipment
-
traction electrical equipment
-
train-stop equipment
-
transient electromagnetic equipment
-
tunneling equipment
-
turning gaging equipment
-
turnout equipment
-
underground equipment
-
underwater equipment
-
underwater TV equipment
-
user equipment
-
vacuum coating equipment
-
vacuum-casting equipment
-
vacuum-distillation equipment
-
vacuum-treating equipment
-
vehicular equipment
-
ventilating equipment
-
video equipment
-
video tape editing equipment
-
warp knitting equipment
-
water treating equipment
-
waterproof electrical equipment
-
welding equipment
-
wellhead equipment
-
well-logging equipment
-
wheel alignment equipment
-
woodworking equipment -
19 continuous current-carrying capacity
длительная пропускная способность по току
—
[Я.Н.Лугинский, М.С.Фези-Жилинская, Ю.С.Кабиров. Англо-русский словарь по электротехнике и электроэнергетике, Москва, 1999 г.]Тематики
- электротехника, основные понятия
EN
(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 IZ
[ 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
EN
DE
- Dauerstrombelastbarkeit, f
- Strombelastbarkeit, f
FR
- courant admissible, m
- courant permanent admissible, m
Англо-русский словарь нормативно-технической терминологии > continuous current-carrying capacity
-
20 ampacity (US)
(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 IZ
[ 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
EN
DE
- Dauerstrombelastbarkeit, f
- Strombelastbarkeit, f
FR
- courant admissible, m
- courant permanent admissible, m
Англо-русский словарь нормативно-технической терминологии > ampacity (US)
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