BS 6657:1991
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
Guide to prevention of inadvertent initiation of electro-explosive devices by radio-frequency radiation
Hardcopy
30-10-2002
English
29-11-1991
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Committees responsible
Foreword
Guide
1 Scope
2 Definitions
3 Responsibility for safety
4 General
5 Radio-frequency hazard
6 Practical considerations of the hazard
7 Site hazard assessment: basic considerations
8 Preliminary assessment
9 Full assessment
10 Practical site testing
11 Safety procedures
12 Special applications
Appendices
A Electromagnetic radiated fields
B Extraction of energy from the radiated field
C Measurement of electromagnetic fields
D Sources of information
Tables
1 Minimum safe distances for standard sensitivity
commercial EED for single transmissions
2 Aerials for vertical polarization for frequencies up
to 30 MHz
3 Aerials for horizontal polarization for frequencies
up to 30 MHz
4 Aerials for frequencies above 30 MHz
5 Modulation factors
6 Multiple transmission assessment
Figures
1 Operational procedure for sites at which EED are
used or are proposed to be used
2 Section through a commercial instantaneous EED
3 Typical single extended line blasting circuits (plan
view)
4 Typical multiple extended line blasting circuits
(plan view)
5 Quarry blast including toe and pop shots
6 Multilevel series-in-parallel demolition blast
7 Field strength versus distance (land path)
8 Field strength versus distance (sea path)
9 Safe field strengths for standard sensitivity EED
10 Safe field strengths for single standard sensitivity
EED with extended lead wires
11 Safe field strengths for standard sensitivity EED
in typical loop circuits of various perimeter
lengths
12 Tuning conditions for loop with firing cable
13 Commercial EED showing winding and overwrapping of
leading wires
Assessing possible hazard arising from radio and other transmitting aerials to the use of electro-explosive devices (EED).
| Committee |
EXL/31
|
| DevelopmentNote |
SUPERSEDES BS 6657: 1986
|
| DocumentType |
Standard
|
| Pages |
0
|
| PublisherName |
British Standards Institution
|
| Status |
Superseded
|
| Supersedes |
| BS 5501-7:1977 | Electrical apparatus for potentially explosive atmospheres Intrinsic safety \'i\' |
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