| International Correspondence Schools - 1908 - 754 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. Wires— a. Must have an approved rubber insulating ' covering. b. Must be always... | |
| Saint Paul (Minn.). - 1908 - 1260 стор.
...any two wires, or 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. 2080. 34. Primary Wires. — a. Must not be brought into or over buildings except... | |
| Henry Charles Horstmann, Victor Hugo Tousley - 1908 - 352 стор.
...550 volts and less than 3,500 volts, shall be considered as a high-potential circuit, and as coining under that class, unless an approved transforming...used, which cuts the difference of potential down to 350 volts or less. (See note following first paragraph under Low-Potential systems. 35. Wires. (See... | |
| Joseph Gerald Branch - 1913 - 316 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. For 550 volt motor equipments a margin of ten per cent, above the 550 "volt limit... | |
| 1913 - 242 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... | |
| 1913 - 460 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. Similarly if the difference of potential between any two wires is over 3,500 volts... | |
| Dallas (Tex.). - 1914 - 266 стор.
...of over 550 volts and less than 3500 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. (a) Must be always in plain sight, and never encased except as provided for in Section... | |
| Harry Cooke Cushing - 1917 - 374 стор.
...volts and less than 3,500 volts, is considered as a highpotential circuit, and as coming under this class, unless an approved transforming device is used, which cuts the difference of potential down to 550 volts or less. For 550 volt motor equipments a margin of ten per cent. above the 550 volt limit... | |
| Terrell Croft - 1917 - 446 стор.
...and less than 3,500 volts, shall be considered as a high-potential circuit, and as coming under this class, unless an approved transforming device is used, which cuts the difference of potential down to 550 volts or less. For 550 volt motor equipments a margin of ten per cent above the 550 volt limit... | |
| 1919 - 444 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. Similarly if the difference of potential between any two wires is over 3,500 volts... | |
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