Permissible explosion-proof electric motors for mines
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Permissible explosion-proof electric motors for mines conditions and requirements for test and approval by Harold Hayward Clark

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Published by Govt. Print. Off. in Washington .
Written in English

Subjects:

  • Electric motors.,
  • Electricity in mining.

Book details:

Edition Notes

Statementby H.H. Clark.
Series[United States] Bureau of mines. Technical paper,, 101
Classifications
LC ClassificationsTN1 .U6 no. 101
The Physical Object
Pagination17 p.
Number of Pages17
ID Numbers
Open LibraryOL6582442M
LC Control Number15026278
OCLC/WorldCa14119836

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Permissible explosion-proof electric motors for mines: conditions and requirements for test and approval / (Washington, D.C.: U.S. Dept. of the Interior, Bureau of Mines, ), by H. H. Clark (page images at HathiTrust). Electric Code (NEC) and C, the Canadian Electric Code. Explosion proof motors may be marked with one or more of the following: Hazardous area classifications NEMA explosion proof AC and DC motors 7 NEMA explosion proof AC and DC motors North American certifications. NEMA/IEC motors are used as power elements of the electric drives. NEMA/IEC motors have explosion-proof performance for three groups, i.e., I, II (subgroup IIB), and III (according to GOST R IEC ). Scope of application: Underground coal mines and pits and their above-ground buildings which are hazardous for firedampFile Size: 2MB. A type of AC or DC electric motor, an explosion-proof motor is used within industrial hazardous locations where fumes and dust are present. Typically available in three-phase and single-phase configurations, the motors are used in fans, blowers, pumps, and air s available include standard foot mounted, C face with base, C face less base, 60 Hz and 50 Hz, jet pump, and.

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in motors protected with ”explosion-proof enclosure – d”. If needed, the data about permitted radial and axial forces acting on motor DE and depending upon the mounting ar-rangement can be requested from manufacturer. All fixing screws must be tightened with adequate torque in order to assure smooth work of motor itself, without File Size: 1MB. Soon after the introduction of electric power into coal mines, it was discovered that lethal explosions could be initiated by electrical equipment such as lighting, signals, or motors. The hazard of fire damp or methane accumulation in mines was well known by the time electricity was introduced, along with the danger of suspended coal dust. IECEx approved explosion proof motors suitable for Zone 1 and 2 applications Three phase from kW (IEC 56 frame) to 55kW (IEC frame), 2 – 4 – 6 pole. Single phase from kW (IEC 56 frame to 4kW (IEC M frame) pole. Single phase dual capacitor versions for high starting torque available on request. IECEx Exd IIC T4 zones 1 and 2. NEMA Explosion-proof AC motors Ball bearings: lubrication intervals in duty hours At the ambient temperature of ≤ +77 °F/+25 °C, the grease lifespan can be expected to double, however, hours is the maximum. In case of frequency inverters and in continuous operation at very low speed.