IEC 60092-506 pdf download – Electrical installations in ships – Part 506: Special features – Ships carrying specific dangerous goods and materials hazardous only in bulk

IEC 60092-506 pdf download – Electrical installations in ships – Part 506: Special features – Ships carrying specific dangerous goods and materials hazardous only in bulk
1scope
1.1 This part of lEC 60092 is applicable to the electrical installations on the following types ofships and cargo spaces:
a) ships and cargo spaces not specifically designed for the carriage of freight containers but
intended for the carriage of dangerous goods in packaged form including goods in freightcontainers and portable tanks;
b) purpose-built container ships and cargo spaces intended for the carriage of dangerous
goods in freight containers and portable tanks;
c) ro/ro ships and rolro cargo spaces intended for the carriage of dangerous goods;
d) ships and cargo spaces intended for the carriage of solid dangerous goods in bulk andmaterials hazardous only in bulk (MHB);
e) ships and cargo spaces intended for the carriage of dangerous goods,other than liquids
and gases in bulk, in shipborne barges.
1.2 Dangerous goods，for which safety measures may be required with respect to theelectrical equipment, are specified in the lMO documents listed in the Foreword and groupedinto the following classes.
a) Dangerous goods in packaged form
Class 1 Explosives，except goods in division 1.4,compatibility group s of the IMDG
Code
Class 2.1 All flammable gases, compressed, liquefied or dissolved under pressure
Class 3 All flammable liquids having a flashpoint from -18 C up to 23°C(closed-cup
test)
Class 6.1 All toxic substances having a flashpoint below 23 °C (closed-cup test)Class 8 All corrosive liquids having a flashpoint 23 °C and below (closed-cup test)b) Solid dangerous goods in bulk
Class 4.1Flammable solids
Class 4.2Substances liable to spontaneous combustion
Class 4.3Substances which, in contact with water, emit flammable gasesClass 5.1Oxidizing substances
Class 9 Miscellaneous dangerous substances，that is, any other substance which
experience has shown,or may show, to be of such a dangerous character thatthe provisions of this part will apply to it.
c) MHB
Materials which，when carried in bulk,present sufficient hazards to require
specific precautions
2Normative references
The following referenced documents are indispensable for the application of this document.Fordated references,only the edition cited applies. For undated references, the latest edition ofthe referenced document (including any amendments) applies.
IEC 60079(all parts),Electrical apparatus for explosive gas atmospheres
IEC 60092-101:1994，Electrical installations in ships – Part 101: Definitions and generalrequirements
IEC 60092-502:1999， Electrical installations in ships – Part 502: Tankers – Special featuresIEC 60529:1989,Degrees of protection provided by enclosures (IP code)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.3.1
hazardous area
area in which an explosive atmosphere is likely to occur in normal operation (comparable withzone 1 as defined inlEc 6o092-502)
NOTE An explosive atmosphere may exist due to gas andlor dust.3.2
extended hazardous area
area in which an explosive atmosphere is not likely to occur in normal operation and, if it doesoccur, is likely to do so only infrequently and will exist for a short period only (and comparablewith zone 2 as defined in lEC 60092-502)
4Hazardous areas
4.1General
Any electrical apparatus permitted in these areas requires special precautions with respect toits construction,certification, and use and, when applicable, its installation.
NOTE All appropriate measures should be taken to prevent flammable gas andlor dust entering spaces adjacentto the hazardous areas.
The following are identified as hazardous areas.
4.2Dangerous goods class 1
Hazardous areas for dangerous goods class 1 as defined in 1.2a):
a) closed cargo spaces and closed or open rolro cargo spaces as indicated in Annex B, item Ab) permanently fixed magazines as indicated in Annex B, item A
4.3Dangerous goods as defined in 1.2b) and 1.2c)
4.3.1 Classes 4.1,4.2,9 and MHB capable of creating explosive dust atmosphereHazardous areas (comparable with zone 1):
a) closed cargo spaces as indicated in Annex B, item A;
b) ventilation ducts，if any,serving the spaces identified in 4.3.1 as indicated in Annex B,
item B.
4.3.2Class 4.3 capable of creating explosive gas atmosphereHazardous areas (comparable with zone 1):
a) closed cargo spaces as indicated in Annex B, item A;
b) ventilation ducts, if any,serving the spaces identified in 4.3.2 as indicated in Annex B,
item B;
c) areas on open deck,or semi-enclosed spaces on open deck，within 1,5 m of any
exhaust ventilation outlet of a hazardous area as indicated in Annex B, item G;
d) enclosed or semi-enclosed spaces having a direct opening into any of the areas as
identified in 4.3.2a) or 4.3.2b) as indicated in Annex B,item C, unless appropriatemeasures are taken to prevent flammable gas or dust entering such spaces asindicated in Annex B, items D. E or F;
.Extended hazardous areas (comparable with zone 2):
e) Enclosed or semi-enclosed spaces having a direct opening into any of the areas
identified in 4.3.2a) or 4.3.2b) which are provided with the closing arrangementsindicated in Annex B,item D, and inside the air lock itself if arranged as indicated inAnnex B, item F;
f) Areas of 1,5 m surrounding open or semi-enclosed spaces of Zone 1 as specified in
4.3.2c) as indicated in Annex B,item G.
4.3.3 Dangerous goods class 2.1,3,6.1*and 8*, as defined in 1.2a)Hazardous areas (comparable with zone 1):
a) closed cargo spaces as indicated in Annex B, item A;
b) ventilation ducts,if any, serving the spaces identified in 4.3.3 as indicated in Annex B,
item B;
c) areas on open deck,or semi-enclosed spaces on open deck，within 1,5 m of any
exhaust ventilation outlet of a hazardous area as indicated in Annex B, item G;
d) enclosed or semi-enclosed spaces having a direct opening into any of the areas as
identified in 4.3.3a) or 4.3.3b) as indicated in Annex B, item C, unless appropriatemeasures are taken to prevent flammable gas or dust entering such spaces asindicated in Annex B, items D, Eor F.