BS EN 61166:1993

Cooperating organizations
National foreword
Foreword
1 Scope and object
2 Normative references
3 Definitions
4 Seismic qualification requirements
5 Severities
6 Qualification by test
6.1 Introduction
6.2 Mounting
6.3 External load
6.4 Measurement
6.5 Frequency range
6.6 Test severity
6.6.1 Parameters for sine-beat excitation
6.6.2 Parameters for time-history excitation
6.7 Testing
6.7.1 Test directions
6.7.2 Test sequence
7 Qualification by combined test and analysis
7.1 Introduction
7.2 Vibrational and functional data
7.3 Analysis
7.3.1 Acceleration time-history method of calculation
7.3.2 Modal analysis using the required response
       spectrum (RRS)
7.3.3 Static coefficient analysis
8 Evaluation of the seismic qualification
8.1 Combination of stresses
8.2 Acceptance criteria of the seismic simulation
8.3 Functional evaluation of the test results
9 Documentation
9.1 Information for seismic qualification
9.2 Test report
9.3 Analysis report
Figures
Annexes
A Characterization of the equipment
ZA (normative) Other international publications
       quoted in this standard with the references of
       the relevant European publications
National annex NA (informative) Committees responsible
National annex NB (informative) Cross-references

Applies only to ground mounted circuit-breakers, the supporting structures of which are rigidly connected with the ground. The seismic qualification of a circuit-breaker is only performed on request.