FOREWORD
EXPLANATORY NOTE
1 General
2 Normative references
SECTION I - D-TYPE FUSES
  1.1 Scope
5 Characteristics of fuses
  5.2 Rated voltage
       5.3.1 Rated current of the fuse-link
       5.3.2 Rated current of the fuse-holder
  5.5 Rated power dissipation of a fuse-link and rated
       acceptable power dissipation of a fuse-holder
  5.6 Limits of time-current characteristics
       5.6.1 Time-current characteristics, time-current
              zones and overload curves
       5.6.2 Conventional times and currents
       5.6.3 Gates
  5.7 Breaking range and breaking capacity
       5.7.2 Rated breaking capacity
6 Markings
7 Standard conditions for construction
  7.1 Mechanical design
       7.1.2 Connections including terminals
       7.1.3 Fuse-contacts
       7.1.4 Non-interchangeability
       7.1.5 Construction of a fuse-base
       7.1.6 Construction of a fuse-carrier
       7.1.7 Construction of a fuse-link
       7.1.8 Construction of a gauge-piece
  7.2 Insulating properties
  7.3 Temperature rise, power dissipation of the fuse-link
       and acceptable power dissipation of the fuse-holder
  7.7 I[2]t characteristics
       7.7.1 Pre-arcing I[2]t values
       7.7.2 Operating I[2]t values
  7.8 Overcurrent discrimination of 'gG' fuse-links
  7.9 Protection against electric shock
8 Tests
       8.1.4 Arrangement of the fuse and dimensions
  8.2 Verification of insulating properties
       8.2.1 Arrangement of the fuse-holder
       8.2.6 Creepage distances, clearances and distances
              through sealing compound
  8.3 Verification of temperature rise and power dissipation
       8.3.1 Arrangement of the fuse
       8.3.3 Measurement of the power dissipation of the
              fuse-link
       8.3.5 Acceptability of test results
       8.5.2 Characteristics of the test circuit
       8.5.8 Acceptability of test results
       8.7.4 Verification of overcurrent discrimination
  8.9 Verification of resistance to heat
       8.9.1 Fuse-base
       8.9.2 Fuse-carrier
  8.10 Verification of non-deterioration of contacts
       8.10.1 Arrangement of the fuse
       8.10.2 Test method
       8.10.3 Acceptability of test results
  8.11 Mechanical and miscellaneous tests
       8.11.1 Mechanical strength
Figures 1 to 10
Annex A (informative) Special test for cable overload
        protection
SECTION IIA - CYLINDRICAL FUSES TYPE A (NF CYLINDRICAL
              FUSE SYSTEM)
  1.1 Scope
2 Definitions
5 Characteristics of fuses
  5.2 Rated voltage
       5.3.1 Rated current of the fuse-link
       5.3.2 Rated current of the fuse-holder
  5.5 Rated power dissipation of a fuse-link and rated
       acceptable power dissipation of a fuse-holder
       5.6.2 Conventional times and currents
       5.6.3 Gates
7 Standard conditions for construction
  7.1 Mechanical design
       7.1.2 Connections including terminals
  7.2 Insulating properties
  7.7 I[2]t characteristics
       7.7.1 Pre-arcing I[2]t values
       7.7.2 Operating I[2]t values
  7.8 Overcurrent discrimination of 'gG' fuse-links
  7.9 Protection against electric shock
8 Tests
       8.1.6 Testing of fuse-holders
       8.3.1 Arrangement of the fuse
       8.3.3 Measurement of the power dissipation of
              the fuse-link
  8.4 Verification of operation
       8.4.1 Arrangement of the fuse
  8.5 Verification of the breaking capacity
       8.5.1 Arrangement of the fuse
       8.5.8 Acceptability of test results
       8.7.4 Verification of overcurrent discrimination
  8.8 Verification of the degree of protection of
       enclosures
       8.8.1 Verification of protection against electric
              shock
  8.9 Verification of resistance to heat
  8.10 Verification of non-deterioration of contacts
       8.10.1 Arrangement of the fuse
       8.10.2 Test method
       8.10.3 Acceptability of test results
  8.12 Verification of the reliability of terminals
Figures 10 to 16
SECTION IIB - CYLINDRICAL FUSES TYPE B
              (BS CYLINDRICAL FUSE SYSTEM)
  1.1 Scope
5 Characteristics of fuses
  5.3 Rated current
       5.3.1 Rated current of the fuse-link
       5.3.2 Rated current of the fuse-holder
  5.5 Rated power dissipation of a fuse-link and rated
       acceptable power dissipation of a fuse-holder
  5.6 Limits of time-current characteristics
       5.6.1 Time-current characteristics, time-current
              curves and overload curves
       5.6.2 Conventional times and currents
  5.7 Breaking range and breaking capacity
       5.7.2 Rated breaking capacity
7 Standard conditions for construction
  7.1 Mechanical design
       7.1.2 Connections including terminals
  7.9 Protection against electric shock
8 Tests
  8.1 General
       8.1.4 Arrangement of the fuse
  8.3 Verification of temperature rise and power dissipation
       8.3.1 Arrangement of the fuse
       8.3.3 Measurement of the power dissipation of the
              fuse-link
  8.4 Verification of operation
       8.4.1 Arrangement of fuse
  8.5 Verification of breaking capacity
       8.5.1 Arrangement of the fuse
       8.5.8 Acceptability of test results
  8.10 Verification of non-deterioration of contacts
       8.10.1 Arrangement of the fuse
       8.10.2 Test method
       8.10.3 Acceptability of test results
Figures 17 to 22
SECTION IIC - CYLINDRICAL FUSES TYPE C
              (ITALIAN CYLINDRICAL FUSE SYSTEM)
  1.1 Scope
5 Characteristics of fuses
       5.3.1 Rated current of the fuse-link
       5.3.2 Rated current of the fuse-holder
  5.5 Rated power dissipation of a fuse-link and rated
       acceptable power dissipation of a fuse-holder
  5.6 Limits of time-current characteristics
       5.6.1 Time-current characteristics, time-current
              zones and overload curves
       5.6.2 Conventional times and currents
       5.6.3 Gates
7 Standard conditions for construction
  7.1 Mechanical design
       7.1.2 Connections including terminals
  7.2 Insulating properties
  7.3 Temperature rise, power dissipation of the fuse-link
       and acceptable power dissipation of the fuse-holder
  7.7 I[2]t characteristics
       7.7.1 Minimum pre-arcing I[2]t values at 0,01 s
       7.7.2 Maximum operating l[2]t values at 0,01 s
8 Tests
       8.1.6 Testing of the fuse-holder
  8.3 Verification of temperature rise and power dissipation
       8.3.1 Arrangement of the fuse
       8.3.3 Measurement of the power dissipation of the
       fuse-link
  8.4 Verification of operation
       8.4.1 Arrangement of the fuse
  8.5 Verification of the breaking capacity
       8.5.1 Arrangement of the fuse
       8.5.8 Acceptability of test results
       8.7.4 Verification of discrimination
  8.9 Verification of resistance to heat
       8.9.1 Test in heating cabinet
       8.9.2 Ball pressure test
  8.10 Verification of non-deterioration of contacts
       8.10.1 Arrangement of the fuse
       8.10.2 Test method
       8.10.3 Acceptability of test results
  8.11 Mechanical and miscellaneous tests
Figures 23 to 28
SECTION III - PIN-TYPE FUSES
  1.1 Scope
2 Definitions
  2.3 Characteristic quantities
5 Characteristics of fuses
  5.5 Rated power dissipation of the fuse-link
  5.6 Limits of time-current characteristics
       5.6.2 Conventional times and currents
       5.6.3 Gates
6 Markings
  6.1 Markings of fuse-holders
  6.2 Markings of fuse-links
  6.4 Markings of the gauge-pieces
7 Standard conditions for construction
  7.1 Mechanical design
       7.1.8 Construction of the gauge-piece
  7.3 Temperature rise, power dissipation of the fuse-link
       and acceptable power dissipation of the fuse-holder
8 Tests
  8.3 Verification of temperature rise and power dissipation
       8.3.1 Arrangement of the fuse
       8.3.3 Measurement of the power dissipation of the
              fuse-link
       8.3.4 Test method
  8.10 Verification of non-deterioration of contacts
       8.10.1 Arrangement of the fuse
       8.10.2 Test method
       8.10.3 Acceptability of test results
Figures 29 to 32
SECTION IV - CYLINDRICAL FUSE-LINKS FOR USE IN PLUGS
             (BS PLUGTOP SYSTEM)
  1.1 Scope
5 Characteristics of fuses
  5.2 Rated voltage
       5.3.1 Rated current of the fuse-link
  5.5 Rated power dissipation of a fuse-link and rated
       acceptable power dissipation of a fuse-holder
       5.6.1 Time-current characteristics, time-current
              zones and overload curves
       5.6.2 Conventional times and currents
       5.6.3 Gates
6 Markings
7 Standard conditions for construction
  7.7 I[2]t characteristics
       7.7.1 Pre-arcing I[2]t values
8 Tests
       8.1.4 Arrangement of the fuse-link for tests
       8.1.5 Testing of fuse-links
       8.2.5 Acceptability of test results
  8.3 Verification of temperature rise and power dissipation
       8.3.1 Arrangement of the fuse
       8.3.4 Test method
       8.3.5 Acceptability of test results
  8.4 Verification of operation
       8.4.1 Arrangement of the fuse
  8.5 Breaking-capacity tests
       8.5.1 Arrangement of the fuse
       8.5.2 Characteristics of the test circuit
       8.5.4 Calibration of the test circuit
       8.5.8 Acceptability of test results
  8.7 Verification of I[2]t characteristics and overcurrent
       discrimination
       8.7.3 Verification of compliance for fuse-links
              at 0,01 s
  8.10 Verification of non-deterioration of contacts
       8.11.1 Mechanical strength
Figures 33 to 36