15 to 20 ft. at point of greatest sag is the norm. utilities typically set poles of specified heights and distances to maintain the desired sag. attached is a chart showing minimum approach distances for energized equipment at different voltages. all voltages can/will arc through the air if a conducting object invades that air space, therefore minimum safe approach distances have been determined for the varying voltages. note, these are approach distances only and does not pertain to sagging of conductors. weather conditions can affect these distances and have been factored in.
Table 19-1A Column 1 Voltage Column 2 Minimum approach distance for working close to exposed electrical equipment or conductors Phase to phase Metres Feet Over 750 V to 75 kV 3 10 Over 75 kV to 250 kV 4.5 15 Over 250 kV to 550 kV 6 20 Purpose of guideline This guideline describes the application of Table 19-1A minimum approach these may vary somewhat from utility to utility. the presence of voltage produces a magnetic field and passing a conductor (extension cord) through that field can produce its own voltage of sufficient strength to cause injury. the higher the voltage the greater the risk. note also-this pertains to non-insulated conductors.
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
... [Read Article]
Latest Ad:
Ford 3-Point Single Bottom Moldboard Plow with Coulter
[More Ads]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
