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BS 7535:1992

Withdrawn
Withdrawn

A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.

Guide to the use of electrical apparatus complying with BS 5501 or BS 6941 in the presence of combustible dusts
Available format(s)

Hardcopy , PDF

Withdrawn date

08-01-2007

Language(s)

English

Published date

08-15-1992

Publisher

British Standards Institution

Committees responsible
Foreword
Guide
Section 1. General
1.1 Scope
1.2 Definitions
1.3 Classification of hazardous areas
1.4 Properties of combustible dusts
1.5 Other hazards
Section 2. Principles for selection of apparatus and
            systems
2.1 General
2.1.1 Selection according to apparatus construction
2.1.2 Selection according to surface temperature
2.1.3 Selection for use within the dust containment
2.2 Selection of apparatus complying with BS 5501 :
       Part 2 (oil immersion 'o')
2.3 Selection of apparatus complying with BS 5501 :
       Part 3 (pressurized apparatus 'p')
2.4 Selection of apparatus complying with BS 5501 :
       Part 4 (powder filling 'q')
2.5 Selection of apparatus complying with BS 5501 :
       Part 5 (flameproof enclosure 'd')
2.6 Selection of apparatus complying with BS 5501 :
       Part 6 (increased safety 'e')
2.7 Selection of apparatus and systems in accordance
       with BS 5501 Part 7 and 9 respectively
       (intrinsically safe apparatus and systems 'i')
2.8 Selection of apparatus complying with BS 5501 :
       Part 8 (encapsulation 'm')
2.9 Selection of apparatus complying with BS 6941
       (with type of protection N)
Section 3. Installation of apparatus and systems
3.1 General
3.2 Installation of apparatus complying with
       BS 5501 : Part 2 (oil immersion 'o')
3.3 Installation of apparatus complying with
       BS 5501 : Part 3 (pressurized apparatus 'p')
3.4 Installation of apparatus complying with
       BS 5501 : Part 4 (powder filling 'q')
3.5 Installation of apparatus complying with
       BS 5501 : Part 5 (flameproof enclosure 'd')
3.6 Installation of apparatus complying with
       BS 5501 : Part 6 (increased safety 'e')
3.7 Installation of apparatus and systems complying
       with BS 5501 : Parts 7 and 9 respectively
       (intrinsically safe apparatus and systems 'i')
3.8 Installation of apparatus complying with
       BS 5501 : Part 8 (encapsulation 'm')
3.9 Installation of apparatus complying with BS 6941
       (with type of protection 'N')
Section 4. Inspection, testing and maintenance of
            apparatus and installations
4.1 General
4.2 Inspection, testing and maintenance of apparatus
       complying with BS 5501 : Part 2 (oil immersion
       'o')
4.3 Inspection, testing and maintenance of apparatus
       complying with BS 5501 : Part 3 (pressurized
       apparatus 'p')
4.4 Inspection, testing and maintenance of apparatus
       complying with BS 5501 : Part 4 (powder filling
       'q')
4.5 Inspection, testing and maintenance of apparatus
       complying with BS 5501 : Part 5 (flameproof
       enclosure 'd')
4.6 Inspection, testing and maintenance of apparatus
       complying with BS 5501 : Part 6 (increased safety
       'e')
4.7 Inspection, testing and maintenance of apparatus
       and systems complying with BS 5501 : Parts 7 and
       9 respectively (intrinsically safe apparatus
       and systems 'i')
4.8 Inspection, testing and maintenance of apparatus
       complying with BS 5501 : Part 8 (encapsulation
       'm')
4.9 Inspection, testing and maintenance of apparatus
       complying with BS 6941 (with type of protection
       N)
Tables
1 Ip rating requirements and impact strength of
       apparatus complying with BS 5501 and BS 6941
2 Minimum action on pressure failure
3 Minimum conductor sizes
4 Minimum clearances
5 Characteristics to be met and failures to be
       taken into consideration for individual cable
       types
6 Inspection schedule for all apparatus
7 Additional inspection schedule for apparatus
       with additional protection
8 Class of insulating material and limiting
       temperature
Figures
1 Identification of zones on drawings
2 Minimum tE time for motors in relation to IA/IN
3 Self-contained apparatus (F.2): paging system
4 Simple apparatus (F.3.4): thermocouple with
       direct deflection indicator
5 Certified associated apparatus
6 Certified apparatus (F.3.2) with compatible
       parameters
7 Other combinations of certified apparatus for
       solenoid valve: barrier
8 Certified systems for microphone and loudspeaker
       system
9 Typical procedural stages for intrinsically safe
       installations
10 Conventional limit switch installation
11 Conventional level switch installation
12 Limit switches in common multicore possibly
       subject to mechanical damage (type A cable)
13 Limit switches connected via a multicore
       adequately supported and protected (type B cable)
14 Limit switch and float switch in individually
       screened circuits bonded at different points
       (type A or B cable)
15 Different circuits within an overall screen
       bonded at one point (type B cable)
16 Typical installation of a screened and armoured
       cable
Appendices
A Procedure for area classification
B Properties of combustible dusts
C Light metal construction and the associated
       frictional sparking risks
D Selection of increased safety 'e' cage motors and
       associated protection devices
E Illustrations of typical intrinsically safe
       installations
F Certification of intrinsically safe electrical
       apparatus and systems
G Examples of the more common combinations of
       'earthed' circuits and screens
H Test for restricted-breathing

Electrical apparatus intended for use in explosive gas atmospheres under conditions where the hazard will be from combustible dust. Electrical apparatus is considered acceptable if it operates safely in an enclosure with a maximum dust layer thickness of five millimetres on its external surface.

Committee
EXL/31
DevelopmentNote
Supersedes 88/29111 DC (10/2005)
DocumentType
Standard
Pages
60
PublisherName
British Standards Institution
Status
Withdrawn

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BS 5501-2:1977 Electrical apparatus for potentially explosive atmospheres Oil immersion \'o\'
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