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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%
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 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.
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.
How do you write the sentence Our school needs a heating system One that is more fuel-efficient than the current system properly?
Our school is in need of a heating system that is more fuel-efficient than the current system. or Our school needs a heating system more fuel-efficient than the current one.
