BS 6657:2002
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
View Superseded by
Assessment of inadvertent initiation of bridge wire electro-explosive devices by radio-frequency radiation. Guide
Hardcopy , PDF
21-11-2019
English
30-06-2003
Committees responsible
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviations
5 General considerations
6 Transmitter and transmitter output parameters
7 Circuits for blasting and well perforation
8 Electro-explosives devices
9 Methods of assessment for determining potential RF ignition
hazards on site where EED are used
10 Practical on-site testing
11 Safety procedures
12 Special applications
Annex A (informative) Extraction of energy from the electromagnetic
field
Annex B (informative) Measurement of electromagnetic fields
Annex C (informative) Sources of information and addresses of
advisory bodies
Annex D (informative) Electromagnetic radiated fields and examples
of radiating antennas and unintended receiving antennas
characteristics
Annex E (informative) The effective resistance of the leading wires
of EED
Annex F (informative) Derivation of minimum distances of safe
approach for Table 2 and Table 3
Annex G (informative) Ground-wave propagation (vertical
polarization) - Calculation of field strength
Annex H (informative) Worked examples to demonstrate the effects of
antenna gain
Annex I (informative) The effects of leading wire resistance,
safety resistors and the use of EED with different
characteristics
Annex J (informative) Derivation of Figure 12a) to Figure 12g) for
EED alone incorporating the resistance of leading wire and
safety resistances
Bibliography
Presents guidance on assessing the potential ignition hazard from the inadvertent extraction of energy from electromagnetic fields, propagated from radio frequency (RF), radar or other transmitter antennas and the coupling of this energy to an electro-explosive device (EED) in a manner capable of causing initiation.
Committee |
EXL/31
|
DevelopmentNote |
Supersedes BS 6657(1991) and 97/261809 DC. (12/2002) Superseded by BS PD CLC/TR 50426 but remains current. (04/2006)
|
DocumentType |
Standard
|
Pages |
94
|
PublisherName |
British Standards Institution
|
Status |
Withdrawn
|
SupersededBy |
This British Standard provides guidance on assessing the possibility of inadvertent extraction of energy from an electromagnetic field propagated from radio frequency (RF), radar or other transmitter antennas and the coupling of this energy to an electro-explosive device (EED) in a manner capable of causing initiation. The frequency range covered by this British Standard is 9kHz to 60GHz. This British Standard only applies to bridge-wire devices which are directly initiated by radio frequency current and does not apply to special detonators, for example, electronic detonators. It does not cover the similar hazard arising from electromagnetic fields generated by other means, for example electric storms, electricity generating plant or power transmission lines.
This British Standard does not apply to the following equipment:
air bag igniters for automotive applications (including the igniters before they are fitted);
special pyrotechnic devices;
pyromechanisms;
igniters for fireworks;
special military devices;
special safety equipment.
NOTE The methods of assessment from 9GHz to 60GHz are based on extrapolation of data for frequencies below 9GHz.
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