IEEE 303-2004 pdf download IEEE Recommended Practice for Auxiliary Devices for Rotating Electrical Machines in Class I, Division 2 and Zone 2 Locations
3.1.8 hazardous area: An area in which a gas or vapor is present, or may be expected to be present in quantiti es suffici ent to produce explosive or ignitable mixtures, and which require appropriate precautions for thedesign, manufacturing, installation and operation of electrical apparatus.
3.1.9 her metically sealed: A device which is so constructed that the external atmosphere cannot gain accessto the interior and in which the seal is made by soldering, brazing, welding or the fusion of glass to metal.Under NFPA 70-2005, hermetically seal ed devices are permitted for current-interrupting contacts.NOTE-See also the sealed device requirements of CENELEC EN 50021-1999; CSA C222 N. 213-M 1987 (R1999):CAN/CSA-E60079-15:02;1EC 60079-15:2001; UL 1604-1994; and UL 60079-15-2002.
3.1.10 intrinsically safe circuit: A circuit in which any spark or thermal effect is incapable of causingignition of a mixture of flammable or combustible material in air under prescribed test conditions. Testconditions generally consider opening, shorting, grounding, or field wiring, along with failures in the circuit.NOTE-Refer to AS/NZS 60079.11:2000; CENELEC EN 50020-2002; CAN/CSA C22.2 No.157-1992; CAN/CSAE60079-11:02;1EC 60079-11:1999; UL 913-2002; and UL 60079-11-2002.
3.1.11 nonincendive: A protective technique where, under norma operating conditions, any arcing or ther.mal effects are not capable of igniting the flammable gas, vapor, or dust-in-air mixture.NOTE-Refer to CENELEC EN 50021-1999 CSA C222 No. 213-M1987 (1999); CAN/CSA-E60079-15:02; IEC60079-15:2001;UL 1604-1994;and UL 60079-15-2002.
3.1.12 non-hazardous: An area in which explosive gasses or vapors are not expected to be present in quantities sufficient to require special precautions.NOTE-Also referred to as an unclassified location.
3.1.13 rotating electrical machine: An electric apparatus depending on electro-magnetic induction for itsoperation and having one or more component members capable of rotary and/or linear movement.NOTE–For the purpose of this document, rotating electrica machines include dc, ac synchronous and asynchronouslypes of motors; dc, ac synchronous and asynchronous types of generators; and ac synchronous condensers
3.1.14 temper ature code: A marking or identification number to show the maximum surface temperature asshown in thefollowing chart:
3.1.15 Zone 2: An areain which an explosive gas atmosphereis not likely to occur in normal operation andif it does occur, is likely to do so only infrequently and will exist for a short period only (less than 10 hoursper year).NOTE-Refer to lEC 60079-10:2002; CENELEC EN 60079-10-1996
3.2 Acronyms
CENELEC European Committee for Electrotechnical StandardizationMaximum Experimental Safe Gap. A method to determine explosive characteristicsemploying a sealed vessel and an ignition gap.NOTE-See Annex A of ASNZS 60079.0:2000: Annex A of CENELEC 50014-1997: or Annex AofIEC 60079-0:2000; and AS/NZS 60079.1.1:2002; rIEC 60079-1-1:2002Minimum lgniting Current. A ratio of the minimum igniting currents for the gas inquestion with that of laboratory methane.NOTE-See Annex A of AS/NZS0079.0:2000: Annex A of CENELEC EN 50014-1997; Annex AofIEC 60079-0:2000: andIEC 60079-3:1990.
Residual Current Device
Resi stance Temperature Detector
IEEE 303-2004 pdf download
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