|
IS Number |
Identical | ||
|
IS 2148 : 2004 |
IEC 60079-1 (2001) | ||
Title :-Electrical Apparatus for Explosive Gas Atmospheres - Flameproof Enclosures "d" (Third Revision) | |||
Unit Price |
Status |
Amendment |
Reaffirmed |
Gr 14 |
Active |
|
|
Page Size |
No. of Pages |
Tech. Committee |
|
A4 |
49 |
ETD 22 |
|
ICS 29.260.20 | |||
1 Scope
1.1 This standard applies to flameproof enclosures of air-filled electrical apparatus having free spaces accessible to gases and vapours.
1.2 This standard specifies the constructional features necessary for flame-proof enclosures of electrical apparatus to ensure safety in service, the test requirements which they should meet and the marking to be applied to them.
1.2.1 This standard does not include the specifications of the apparatus within the enclosure and for these references to the relevant Indian Standard specification should be made.
1.3 These enclosures are suitable for housing electrical apparatus in mines and such other places where a mixture of air and flammable gas or vapour may occur, under the assumption as laid in 0.6 to 0.10.
13.1 It shall be understood that the flameproof apparatus constructed on the lines recommended here should not normally be used in atmospheres or locations which are known to contain dangerous concentration above limits which have been laid down by a statute or otherwise by the statutory authority concerned. However, flameproof apparatus is suitable for use in Divisions 1 and 2 hazardous areas classification as per IS 5572 (Part I)-1978.
1.4 The flameproof enclosures are grouped according to the dimensions of the gaps between their joint surfaces, and an indication is given of the nature of the explosive gas atmosphere for which each group is appropriate.
1.5 This standard applies to metallic, non-metallic and composite enclosures but for the present the additional requirements necessary for non-metallic materials are left to the discretion of the approving authority based on the recommendations of the testing authority.
1.6 Explosive gas atmospheres for which safe gaps are smaller than those given in this standard are not at present covered by these recommendations.
1.7 This standard deals only with flameproof enclosures and not with other means of protection against an explosive hazard such as:
a) enclosures of large batteries as are used on locomotives and which need to be made safe by adoption of other means;
b) dust-tight, sand-filled, or hermetically sealed enclosures;
c) pressurized enclosures;
d) oil-immersed protection; and
e) increased safety.
2 References
IS 2 : 1960 Rules for rounding off numerical values
IS 34 : 1975 Specification for basic carbonate of lead (white lead) for paints
IS 2148 : 1968 Method of test for ascertainment of maximum experimental safe gaps
IS 2835 : 1977 Specification for flat transparent sheet glass
IS 4218 : Part IV : 1978 ISO metric screw threads: Part VI Limits of sizes for commercial bolts and nuts
IS 5572 : Part I : 1978 Classification of hazardous areas (other than mines) for electrical installations: Part I Areas having flammable gases and vapours
IS 8241 : 1976 Method of marking for identifying electrical equipment for explosive atmospheres
IS 9570 : 1980 Classification of flammable gases or vapours with air according to their maximum experimental safe gaps and minimum igniting currents
IS 9735 : 1981 Method of test for ascertainment of maximum experimental safe gaps