IEC 60092-502:1999 pdf download – Electrical installations in ships -Part 502: Tankers – Special features

IEC 60092-502:1999 pdf download – Electrical installations in ships -Part 502: Tankers – Special features.
This part of IEC 60092 deals with the electrical installations in tankers carrying liquids wtiich are flammable, either inherently, or due to their reaction with other substances, or flammable liquefied gases.
The requirements in other parts of IEC 60092 also apply to tankers, unless otherwise mentioned in this standard,
2 Normative references
The following normative documents contain provisions which. through reference in this text. constitute Provisions of this part of lEG 60092. At the time of publication, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this part of IEC 60092 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below 1embers of IEC and ISO maintain registers of currently valid International Standards.
IEC 60050(426) 1990. Internazior,al Electrotechnical Vocabulary (1EV) — Chapter 426: Electrical apparatus for explosive atmospheres
lEG 60079-0:1983. Electrical apparatus for explosive gas atmospheres — Part 0.’ General requirements
lEG 60079-1:1990. Electrical apparatus for explosive gas atmospheres — Part 1: Construction and verification test of flameproof enclosures of electrical apparatus
lEG 60079-2:1983. Electrical apparatus for explosive gas atmospheres — Part 2: Electrical apparatus, type of protection ‘
lEG 60079-4:1975. Electrical apparatus for explosive gas atmospheres — Part 4.’ Method of test br ignition temperature
IEC 60079-5:1997, Electrical apparatus for explosive gas atmospheres — Part 5: Powder filling q lEG 60079-6:1995. Electrical apparatus for explosive gas atmospheres — Part 6: Oil-immersion ‘o
IEC 60079-7:1990. Electrical apparatus for explosive gas atmospheres — Part 7: Increased safety ‘e’
IEC 60079.10:1968. Electrical apparatus for explosive gas atmospheres — Part 10:
Classification of hazardous areas
IEC 60079-11:1991. Electrical apparatus for explosive gas atmospheres — Part Ii: Intrinsic safety I
3.4
enclosure
all the walls which surround the live parts 01 electrical apparatus including doors, covers. cable entries, rods, spindles and shafts, ensuring the protection 01 the electrical apparatus (1EV 426-04-01, modified)
3.5
explosion protected enclosure
enclosure, the mechanical integrity of which is considered essential for, and is examined in detail for, Its certification or acceptance for use In a hazardous area
3.6
explosive limits
3.6,1
lower explosive limit (LEL)
concentration of flammable gas, vapour or mist in air, below winch an explosive gas atmosphere will not be formed [1EV 426-02-09)
3.6.2
upper explosive lmit (UEL)
concentration of flammable gas, vapour or mist in air, above which an explosive gas atmosphere will not be formed (1EV 426-02-10)
3.7
explosive gas atmosphere
mixture with air, under atmospheric conditions, of flammable substances in the form of gas, vapour or mist, In which, after Ignition, combustion spreads throughout the unconsumed mixture [1EV 426-02-03)
3.8
flameproof enclosure ‘Sd’
type of protection of electrical apparatus in which the enclosure will withstand an internal explosion of a flammable mixture which has penetrated into the interior, without suffering damage and without causing ignition, through any joints or structural openings in the enclosure. of an external explosive atmosphere consisting of one or more of the gases or vapours for which It is designed 11EV 426-0601)
NOTE — PEC 60079l specifies the conslructoflaJ leatures and test reQuirements for apparatus usinQ this method of protection.
flammable gas or vapour
gas or vapour which, when mixed with air In certain pfoportions, will form an explosive gas atmosphere (IEC 60079-10, 2.14)
3.10
flammable liquid
liquid capable of producing a flammable vapour or mist under any foreseeable operating conditions (IEC 6007910. 2.13 modified)
flammable material
material consisting of flammable gas, vapour, liquid andlor mist (IEC 60079-10. 2.12 modified)
3.12
flammable mist
droplets of flammable liquid, dispersed In air, so as to form an explosive atmosphere.