CABLE PULLING CALCULATIONS FOR RACEWAYS


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CABLE PULLING CALCULATIONS FOR RACEWAYS
CABLE PULLING CALCULATIONS FOR RACEWAYS131. Raceways must be proofed and conductors must be sized and coordinated so conductor insulation is not damaged during installation, by NEC rules. Statistics have shown that over 90 percent of failures to medium-voltage conductors in raceways stem from faulty installation practice during the process of pulling the conductors into the raceway. Statistics aren't available for lower voltage applications, but undoubtedly a large percentage of failures at these voltages have a similar cause. Often these failures don't show up for years, making it difficult to assign blame. It is very important to understand the factors that go into a successful installation that does not overstress the insulation.The …
Citation
Terrell Croft; Frederic P. Hartwell; Wilford I. Summers: American Electricians' Handbook, Sixteenth Edition. CABLE PULLING CALCULATIONS FOR RACEWAYS, Chapter (McGraw-Hill Professional, 2013), AccessEngineering Export