 | American Institute of Electrical Engineers - 1897 - 708 стор.
...protected from mechanical injury by a substantial boxing, retaining an air space of one inch around the conductors, closed at the top (the wires passing through bushed holes), and extending not less than seven feet from the floor. When crossing floor timbers in cellars or in rooms, where they might be... | |
 | American Society of Mechanical Engineers - 1898 - 1122 стор.
...protected from mechanical injury by a substantial boxing, retaining an air space of one inch around the conductors, closed at the top (the wires passing through bushed holes), and extending not less than seven feet from the floor. When crossing floor timbers in cellars or in rooms, where they might be... | |
 | Francis Bacon Crocker - 1901 - 514 стор.
...conductor, closed at the top (the wires passing through bushed holes), and extending not less than five feet from the floor; or by an iron-armored or metal-sheathed...conduit sufficiently strong to withstand the strain it will he subjected to ; or plain metal pipe, lined with insulating tubing, which must extend one-half... | |
 | Horatio Alvah Foster - 1901 - 1018 стор.
...walls may be secured by a substantial boxing, retaining an air space of one inch around the conductor, closed at the top (the wires passing through bushed holes), and extending not less thanir.e feet from the floor; or by an iron-armored or metal -sheathed iiisulatmg conduit sufficiently... | |
 | Francis Bacon Crocker - 1901 - 528 стор.
...secured by a substantial boxing, retaining an air space of one incb around tbe conductor, closed at tbe top (the wires passing through bushed holes), and extending not less than five feet from the floor ; or by an iron-armored or metal-sheathed insulating conduit sufficiently... | |
 | 1902 - 738 стор.
...walls may be secured by a substantial boxing, retaining an air space of 1 inch around the conductor, closed at the top (the wires passing through bushed...than 5 feet from the floor; or by an iron-armored or inctal-shealhed insulating conduit sufficiently strong to withstand the strain it will be subjected... | |
 | George Velten Steeb - 1902 - 230 стор.
...protected from mechanical injury by a substantial boxing, retaining an air space of one inch around the conductors, closed at the top (the wires passing through bushed holes), and extending not less than 7 feet from the floor; when crossing floor timbers in cellars or in rooms, where they might be exposed... | |
 | Harry Cooke Cushing - 1902 - 204 стор.
...protected from mechanical injury by a substantial boxing, retaining an air space of one inch around the conductors, closed at the top (the wires passing through bushed holes), and extending not less than seven feet from the floor. When crossing floor timbers in cellars or in rooms, where they might be... | |
 | 1902 - 742 стор.
...side walls from mechanical injury by a substantial boxing, retaining an air space of 1 inch around the conductors, closed at the top (the wires passing through bushed holes) and extending not less than 7 feet from the floor. When crossing floor timbers in cellars or in rooms where they might be exposed... | |
 | American School (Lansing, Ill.) - 1903 - 320 стор.
...protected from mechanical injury by a substantial boxing retaining an air space of one inch around the conductors, closed at the top (the wires passing through bushed holes), and extending not less than seven feet above the floor. When crossing floor timbers in cellars or in rooms, where they might be... | |
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Must, on side walls be protected from mechanical injury by a substantial boxing, retaining an air space of one inch around the conductors, closed at the top (the wires passing through bushed holes ) , and extending not less than seven feet from the floor. 
