BS 88-1(1988) : 1988 AMD 8310

National foreword
Committees responsible
Clause
1 General
   1.1 Scope
   1.2 Object
2 Definitions
   2.1 Fuses and their component parts
   2.2 General terms
   2.3 Characteristic quantities
3 Conditions for operation in service
   3.1 Ambient air temperature (Ta)
   3.2 Altitude
   3.3 Atmospheric conditions
   3.4 Voltage
   3.5 Current
   3.6 Frequency, power factor and time constant
   3.7 Conditions of installation
   3.8 Utilization category
   3.9 Discrimination of "gG" and "gM" fuses
4 Classification
5 Characteristics of fuses
   5.1 Summary of characteristics
   5.2 Rated voltage
   5.3 Rated current
   5.4 Rated frequency
   5.5 Rated power dissipation of a fuse-link and rated
         power acceptance of a fuse-holder
   5.6 Limits of time-current characteristics
   5.7 Breaking range and breaking capacity
   5.8 Cut-off current and I2t characteristics
6 Markings
   6.1 Markings of fuse-holders
   6.2 Markings of fuse-links
   6.3 Marking symbols
7 Standard conditions for construction
   7.1 Mechanical design
   7.2 Insulating properties
   7.3 Temperature rise, power dissipation of the fuse-
         link and power acceptance of the fuse-holder
   7.4 Operation
   7.5 Breaking capacity
   7.6 Cut-off characteristic
   7.7 I2t characteristics
   7.8 Overcurrent discrimination of "gG" and "gM"
         fuse-links
   7.9 Protection against electric shock
   7.10 Resistance to heat
   7.11 Mechanical strength
   7.12 Resistance to corrosion
   7.13 Resistance to abnormal heat and fire
8 Tests
   8.1 General
   8.2 Verification of the insulating properties
   8.3 Verification of temperature rise and power
         dissipation
   8.4 Verification of operation
   8.5 Verification of the breaking capacity
   8.6 Verification of the cut-off current
         characteristic
   8.7 Verification of I2t characteristics and
         overcurrent discrimination
   8.8 Verification of the degree of protection of
         enclosures
   8.9 Verification of resistance to heat
   8.10 Verification of non-deterioration of contacts
   8.11 Mechanical and miscellaneous tests
Figures
Appendix A - Measurement of short-circuit power factor
Appendix B - Calculation of pre-arcing I2t values for
             "gG" and "gM" fuse-links
Appendix C - Calculation of cut-off current-time
             characteristic
Appendix D - Effect of change of ambient temperature or
             surroundings on the performance of fuse-
             links

Tries to establish the characteristics of fuses or parts of fuses (fuse carrier, fuse base and fuse base) in such a manner that they can be replaced by other fuses or parts of fuses having the same characteristics as long as they are interchangeable in as much as their dimensions are concerned. Applies to fuses incorporating enclosed current limiting fuse links with minimum 6 kA rated breaking capacities, meant to protect power frequency a.c. circuits of maximum 1000 V nominal voltages or d.c. circuits of 1500 V maximum nominal voltages. BS AMD 8310 RENUMBERS THIS STANDARD