April 2021
Intermediate to advanced
404 pages
12h 18m
English

The very first electrical standard in the United States was called “Electric Light Wires, Lamps, etc.,” and it was written by the New York Board of Fire Underwriters in 1881. It had five simple rules for installers: (1) use wires with 50% more ampacity than the connected load, (2) use wires that are “insulated and doubly coated with some approved material,” (3) fasten the wires with approved non-conducting fasteners every 2-1/2” for incandescent lamps and every 8” for arc lamps, 8” from all other wires or metal conductive surfaces in the open where they can be inspected, (4) protect arc lamps with glass globes to prevent sparks or hot carbon ...
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