The National Electrical Code An Analysis And Explanation of the Underwriters E
The National Electrical Code An Analysis And Explanation of the Underwriters E
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The result is that the large wire will get hotter with four amperes than the small wire will with one ampere. It follows, therefore, that if one wire has twice the sectional area of another, it will have something less than twice the safe-carrying capa- city.
Upon consulting the table, we will see that while a No. O wire has almost exactly twice the area of a No. 3 wire, the No. 3 wire is allowed to carry 75 amperes, while the No. O wire is allowed to carry only 125 am- peres. The greater the d...ifference in the sizes, the more conspicuously is this shown in the table. While a No. 10 wire may carry 25 amperes, a No. O wire (with ten times the sectional area) is allowed to carry only five times that current. The calculation of the relative currents allowed for different sizes of wires involves considerable figuring, and a table of "capacities" is a most useful thing, and no wire used in electrical con- struction should ever be allowed to carry a greater cur- rent than that allowed in the table.
What to read after The National Electrical Code An Analysis And Explanation of the Underwriters E?
You can find similar books in the "Read Also" column, or choose other free books by Richard H Richard Henry Pierce to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The result is that the large wire will get hotter with four amperes than the small wire will with one ampere. It follows, therefore, that if one wire has twice the sectional area of another, it will have something less than twice the safe-carrying capa- city.
Upon consulting the table, we will see that while a No. O wire has almost exactly twice the area of a No. 3 wire, the No. 3 wire is allowed to carry 75 amperes, while the No. O wire is allowed to carry only 125 am- peres. The greater the d...ifference in the sizes, the more conspicuously is this shown in the table. While a No. 10 wire may carry 25 amperes, a No. O wire (with ten times the sectional area) is allowed to carry only five times that current. The calculation of the relative currents allowed for different sizes of wires involves considerable figuring, and a table of "capacities" is a most useful thing, and no wire used in electrical con- struction should ever be allowed to carry a greater cur- rent than that allowed in the table.
What to read after The National Electrical Code An Analysis And Explanation of the Underwriters E?
You can find similar books in the "Read Also" column, or choose other free books by Richard H Richard Henry Pierce to read onlineMoreLess
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