Circular of the Bureau of Standards Volume 23

Circular of the Bureau of Standards Volume 23

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910 edition. Excerpt: ...such as marble, or slate free from metallic veins, and be fixed in as dry a situation as practicable. Rule 8.--No repairing of the live parts of any electrical apparatus, except cleaning or oiling, shall be done when the current is on. Where the live parts of switches, or machines working at a pressure exceeding the limits of low pressure, may have to be handled for the purpose of adjustment, or for such wiping or oiling, insulating gloves, or mats of india rubber or other suitable material, shall be supplied by the operator and shall be used by the attendants. Rule g.--At every gaseous mine where electricity is used below ground for power, there shall be employed a competent mine electrician who shall be subject to the authority of the mine foreman and superintendent, and shall have full charge of all electrical machinery and apparatus in the mine. The mine electrician, or an assistant mine electrician, shall be on duty at the mine when the electrical apparatus or machinery in use for the production of coal requires more than 25 horsepower. After the expiration of twelve months from the passage of this act no person shall be allowed to act as a mine electrician, or as an assistant mine electrician, in a gaseous mine unless he shall be the holder of a certificate of competency issued by the department of mines. Every person appointed to operate any electrical apparatus in a mine shall have been instructed in his duty by the electrician or mine foreman. Rule 10.--Fire buckets filled with clean dry sand shall be kept in the mines where Stationary electrical apparatus is located ready for immediate use. Rule ii.--I nstructions shall be posted at the mine entrance and in every generating, transforming, and motor house for the resuscitation more

Product details

  • Paperback | 50 pages
  • 189 x 246 x 3mm | 109g
  • United States
  • English
  • black & white illustrations
  • 1236831470
  • 9781236831477