The Code of Federal Regulations of the United States of AmericaU.S. Government Printing Office, 1976 The Code of Federal Regulations is the codification of the general and permanent rules published in the Federal Register by the executive departments and agencies of the Federal Government. |
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عبارات ومصطلحات مألوفة
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مقاطع مشهورة
الصفحة 16 - motor boat," where used in this Act, shall include every vessel propelled by machinery and not more than sixty-five feet in length, except tugboats and towboats propelled by steam. The length shall be measured from end to end over the deck, excluding sheer...
الصفحة 86 - normal condition" means that equipment operating at maximum available voltage and current. (ii) The term "abnormal condition" means that equipment operating under conditions resulting from accidental damage to any part of the equipment or wiring, insulation or other failure of electrical components, application of overvoltage, adjustment and maintenance operations, and other similar conditions. The analysis of an "abnormal condition" of equipment will be considered to be not more than two independent...
الصفحة 15 - Intrinsically safe equipment and wiring shall not be capable of releasing sufficient electrical or thermal energy under normal or abnormal conditions to cause ignition of a specific hazardous atmospheric mixture in its most easily ignited concentration. Abnormal conditions shall include accidental damage to any field-installed wiring, failure of electrical components, application of overvoltage. adjustment and maintenance operations, and other similar conditions.
الصفحة 81 - Locations. Class I locations are those in which flammable gases or vapors are or may be present in the air in quantities sufficient to produce explosive or ignitable mixtures.
الصفحة 66 - Any mot or of one horsepower or less which is portable, is manually started and is within sight from the starter location, shall be considered as protected against overcurrent by the overcurrent device protecting the conductors of the branch circuit. This branch circuit overcurrent device shall not be larger than that specified by table...
الصفحة 66 - If the impedance of the motor windings is sufficient to prevent overheating due to failure to start, the motor may be protected as specified in paragraph (c) of this section for manually started motors.
الصفحة 69 - ... the machine is always under the manual control of a qualified operator. (1) Separately excited direct-current motors. (2) Series motors. (3...
الصفحة 13 - Apparatus enclosed in a case that is capable of withstanding an explosion of a specified gas or vapor which may occur within it and of preventing the ignition of a specified gas or vapor surrounding the enclosure by sparks, flashes, or explosion of the gas or vapor within, and which operates at such an external temperature that a surrounding flammable atmosphere will not be ignited thereby.
الصفحة 84 - Switches, circuit breakers, motor controllers, and fuses. Switches, circuit breakers, motor controllers and fuses, including pushbuttons, relays and similar devices, which are intended to interrupt current in the normal performance of the function for which they are installed, or which are installed where dusts of an electrically conducting nature may be present, shall be provided with dusttight enclosures approved for Class II locations.
الصفحة 82 - Division 1 location, and to which hazardous concentrations of gases or vapors might occasionally be communicated unless such communication is prevented by adequate positive-pressure ventilation from a source of clean air, and effective safeguards against ventilation failure are provided.