 | New York (N.Y.). Board of Aldermen - 1920 - 904 стор.
...between any 2 wires, of over 3,500 volts, shall be considered as an extra-high potential circuit, and as coming under that class, unless an approved transforming...used, which cuts the difference of potential down to 3,500 volts or less; 7. High-potential system, any circuit attached to any machine or combination of... | |
 | Terrell Croft - 1920 - 488 стор.
...over 3,500 volts, shall be considered as an extra-high-poteniial circuit, and as coming under this class, unless an approved transforming device is used, which cuts the difference of potential down to 3,500 volts or less. 47. PRIMARY WIRES. 47. Tf7. PRIMARY WIRES. Must not be brought into or over buildings,... | |
 | New York (N.Y.) - 1922 - 636 стор.
...any two wires, of over 3,500 volts, shall be considered as an extra-high potential circuit, and as coming under that class, unless an approved transforming...used, which cuts the difference of potential down to 3,500 volts or less. 7. High-potential system. Any circuit attached to any machine or combination of... | |
 | New York (N.Y.) - 1913 - 254 стор.
...any two wires, of over 3,500 volts, shall be considered as an extra high-potential circuit, and as coming under that class, unless an approved transforming...used, which cuts the difference of potential down to 3,500 volts or less. 47. Primary Wires. a. Must not be brought into or over buildings, except power... | |
 | Calvin Franklin Swingle - 1906 - 488 стор.
...of over 550 volts and less than 3,500 volts, shall be considered as a high-potential circuit, and as coming under that class, unless an approved transforming...used, which cuts the difference of potential down to 550 volts or less. 35. Wires. (See also Nos. 14, 15 and 16.) a. Must have an approved rubber-insulating... | |
 | 1890 - 768 стор.
...wires must be covered with some material of high insulating power, not easily abraded ; they must be firmly secured to properly insulated and substantially built supports. All tie wires must have an insulation equal to that of the conducting wires. 8. All joints must be so made that a... | |
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VOLTS. Any circuit attached to any machine or combination of machines which develops a difference of potential, between any two wires, of over... 
