Questions And Answers On the National Electrical Code a Key And Index to the of
Questions And Answers On the National Electrical Code a Key And Index to the of
Thomas Stanislaus Mcloughlin
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) 759. What is the least spacing between bridge collector wires allowed? Two and one -half inches; recommended that greater spacing be used whenever possible. (43-3-4. ) 760. What are the minimum sizes for collector wires ac- cording to the distance between rigid supports? "Distance between Size wire rigid supports required Feet B. & S. o to 30 6 31 to 60 4 Over 60 2 (43 -a -50 761. How must collectors be designed with reference to sparking? So that it will be reduced to a minimum. (43 -b. ) Sw...itches and Cut-outs. 762. Can one main switch be used for all motors of an j electric crane? Yes. (Italics, 43. ) OFFICIAL NATIONAL ELECTRICAL CODE 137 763. Is a cut-out and switch necessary for the main col- lector wires, and how must it be located? Yes; located easy of access from floor. (43-0-1. ) 764. Is a cut-out and a switch necessary for leads from main collector wire on electric cranes operated from cabs; and where must they be located? Yes; readily accessible to operator. (43-0-2. ) 765.
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