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If ther are more than conductors in the raceway the ampacity of the conductors must be derated?
Ampacity must be derated depending on the number of conductors and the ambient temperature. In the Canadian Electrical Code Table 5C denotes derating for the number of conductors. 1-3 conductors = 100% load 4-6 conductors = 80% 7-24 conductors = 70% 25-42 conductors = 60% 43 or more conductors = 50%
How many current carrying conductors can you have in a conduit before you have to start derating amparage?
The number of current-carrying conductors allowed in a conduit before derating is specified by the National Electrical Code (NEC). Generally, if you have more than three conductors in a conduit, you need to start derating the ampacity of the conductors. Specifically, for more than three conductors, the ampacity of each conductor must be reduced based on the number of conductors present. For example, with 4 to 6 conductors, the ampacity is typically reduced to 80%, and with 7 to 9 conductors, it’s reduced to 70%.
What is a drawback to superconductors?
One of the main disadvantages of copper cables is that copper is expensive compared with other metals such as iron or aluminum. Copper can also corrode, though not as much as some other metals.
Why the spacing between the conductors of same phase is greater as compared to spacing between different phase conductors in double circuit lines?
I think you mean spacing between line conductors, rather than phase conductors. If there is a greater spacing between line conductors in one circuit, compared with anothercircuit, then the two circuits are operating at different voltages.
What ways are there to convert 480 3 Phase to 208 3 phase?
It depends on your definition of efficiency. 480 can certainly push more power than 208 through the same size conductors, but it would not be efficient to wire a motor for 480 when 208 was all that was needed.
What shows how conductors insulators superconductors and semiconductors rank in order of least resistance to most resistance?
Superconductors have no resistance, making them the best conductors. Semiconductors have moderate resistance. Conductors have low resistance, making them better conductors than insulators, which have high resistance, making them the poorest conductors.
Which has the lowest resistance semiconductors superconductors insulator conductor?
Superconductors have the lowest resistance of all materials, with resistance dropping to zero when they are cooled below a certain critical temperature. Conductors have lower resistance than semiconductors and insulators, which have significantly higher resistance and do not conduct electricity as effectively.
What is the definition of low temperature supercoductors?
In a way, all currently existing superconductors are "low-temperature", but some more so than others. The traditional superconductors work up to about 20 K (or minus 253 Centigrade); more recent "high-temperature superconductors" work up to 100 K or so. 100 K is still minus 173 Centigrade, but it is much "hotter" than the traditional superconductors. The new "high-temperature" superconductors apparently work different than the old-fashioned ones; at least, the theory that explains the traditional superconductors fails to explain how the new superconductors work.
What is super conducters?
Most conductors have resistance, which causes two problems: you lose energy in the conductor, so you need more electricity than you would with no resistance in the line, and you gain heat. Superconductivity is a property of some conductors where there is no resistance. Because superconductivity requires extremely low temperatures to work, only in places where you cannot have any losses at all--like cyclotrons--do you use superconductors.
What are the benefits of quartz heaters over ordinary electric heaters?
Quartz Heaters are unique in a number of ways. Most notably, the design of these heaters is such that it is more efficient than ordinary heaters. This allows it to deliver more heat for less cost.
What is more energy efficient than ordinary backlighting?
OLED (organic light-emitting diode) technology is more energy efficient than ordinary backlighting because each pixel emits its own light, eliminating the need for a separate backlight. This allows OLED displays to consume less power while providing better contrast and color accuracy.
Why is electrostatic spray gun more efficient than ordinary spray gun?
The electrostatic spray gun is more efficient than an ordinary spray gun because more of the paint gets on to the object being painted. The droplets being charged makes them become attracted to what is being painted, rather than spraying all around.
What do you mean by electrical double wrapped cross joint?
An electrical double wrapped cross joint is just like an ordinary cross joint but double wrapped with electrical tape. It is used where two tap conductors need to extend away from the branch conductor in the opposite direction and is stronger than the ordinary cross joint.
WHY STRANDED CONDUCTERS ARE USED IN POWER CABLES?
Stranded conductors are more flexible than solid conductors.
Metals are conductors of heat and electricity?
Yes, but some metals are better conductors than others.
How do electrons in conductors move about freely than the electrons in insulators what?
Electrons in conductors, such as metals, are loosely bound to their atoms and can move freely through the material, facilitating the flow of electric current. In contrast, electrons in insulators are tightly bound to their atoms and do not have the ability to move freely, which prevents the flow of electric current. This difference in electron mobility is due to the varying atomic structures and energy band gaps in conductors and insulators. As a result, conductors allow for efficient electron transport, while insulators resist it.
If ther are more than conductors in the raceway the ampacity of the conductors must be derated?
Ampacity must be derated depending on the number of conductors and the ambient temperature. In the Canadian Electrical Code Table 5C denotes derating for the number of conductors. 1-3 conductors = 100% load 4-6 conductors = 80% 7-24 conductors = 70% 25-42 conductors = 60% 43 or more conductors = 50%
