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BSI 21/30412431 DC:2021 Edition

BSI 21/30412431 DC:2021 Edition

$13.70

BS 7657. Specification for cut out assemblies up to 100 A rating, for power supply to buildings

Published By Publication Date Number of Pages
BSI 2021 28
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PDF Catalog

PDF Pages PDF Title
1 30412431.PDF
3 30412431.pdf
5 1 Scope
2 Normative references
6 3 Terms and definitions
3.1 cut-out assemblies, fuses and their components
3.1.1 cable termination enclosure
3.1.2 circuit breaker (CB)
3.1.3 cut-out assembly
3.1.4 fuse-base (fuse-mount)
3.1.5 fuse-base contact (fuse-mount contact)
3.1.6 fuse-carrier
7 3.1.7 fuse-carrier contact
3.1.8 fuse (cut-out)
3.1.9 fuse-holder
3.1.10 fuse-link
3.1.11 fuse-link contact
3.1.12 fuse-unit
3.1.13 interconnecting unit
3.1.14 protection device
3.2 protection and insulation
3.2.1 basic insulation
3.2.2 double insulation
3.2.3 reinforced insulation
8 3.2.4 supplementary insulation
4 Classification
9 9.3.3.4.2 Routine tests
9.3.4 Performance under short-circuit conditions
10 9.3.3.4.2 Routine tests
9.3.4 Performance under short-circuit conditions
11 6.3 Instructions for installation, operation and maintenance, decommissioning and dismantling
6.4 Vacant
7 Normal service and mounting and transport conditions
7.1 Normal service conditions
7.2 Vacant
7.3 Mounting
7.3.1 General
7.3.2 Type A protective-units
7.3.3 Type B fuse-holders, terminal blocks and interconnecting units
8 Constructional and performance requirements
8.1 Constructional requirements
8.1.1 General
12 8.1.2 Materials
8.1.2.1 General
8.1.2.2 Resistance to normal heat
8.1.2.3 Resistance to abnormal heat
8.1.2.4 Resistance to fire
8.1.2.5 Material classification
8.1.2.6 Environmental performance
8.1.3 Current-carrying parts and their connections
13 8.1.4 Clearances and creepage distances
8.1.5 Vacant
8.1.6 Vacant
8.1.7 Vacant
8.1.8 Terminals
8.1.8.1 Constructional requirements
8.1.8.2 Connecting capacity
14 8.1.8.3 Connection
8.1.8.4 Terminal identification and marking
8.1.8.5 Terminal positions
8.1.9 Vacant
8.1.10 Vacant
8.1.11 Dedicated enclosures for equipment
8.1.11.1 Design
8.1.11.1.1 General
15 8.1.11.1.2 Cable termination cover for Type A protective-units
8.1.11.1.3 Neutral and earth cover for Type A fuse-units
8.1.11.2 Vacant
8.1.12 Degrees of protection of enclosed equipment
16 8.1.13 Vacant
8.2 Performance requirements
8.2.1 Vacant
8.2.2 Temperatureā€‘rise
8.2.2.1 General
8.2.2.2 Long-term contact stability
17 8.2.2.3 Mechanical endurance ā€“ fused protective units
8.2.3 Dielectric properties
8.2.3.1 General
8.2.3.2 Performance on overload and short circuits
9 Tests
9.1 Kinds of tests
9.1.1 General
9.1.2 Type tests
19 9.2 Conformity to constructional requirements
9.2.1 Materials
9.2.1.1 Flammability test
20 9.2.1.2 Environmental test
9.2.2 Equipment
9.2.2.1 Impact test
9.2.2.2 Mechanical tests on security sealing lugs
9.2.3 Vacant
9.2.4 Enclosures for equipment
21 9.2.5 Mechanical and electrical properties of terminals
9.2.5.1 Vacant
9.2.5.2 Vacant
9.2.5.3 Testing for damage to and accidental loosening of conductors (flexion test)
9.2.5.4 Terminal pull test
9.3 Performance
9.3.1 Test sequences
9.3.2 General test conditions
9.3.2.1 General requirements
22 9.3.2.2 Test quantities
9.3.2.2.1 Values of test quantities
9.3.2.2.2 Tolerances on test quantities
9.3.2.3 Vacant
9.3.2.4 Test reports
9.3.3 Performance under no load, normal load and overload conditions
9.3.3.1 Vacant
9.3.3.2 Vacant
9.3.3.3 Temperature-rise
9.3.3.3.1 Ambient air temperature
9.3.3.3.2 Measurement of the temperature of parts
9.3.3.3.3 Temperature-rise of a part
9.3.3.3.4 Temperature-rise of the main circuit
9.3.3.3.4.1 General
23 9.3.3.3.4.2 Test for temperature-rise at rated current
24 9.3.3.3.4.3 Mechanical endurance test: fuse protective units
9.3.3.3.4.4 Overload test
25 9.3.3.3.4.5 Cyclic loading temperature-rise tests: Type A and Type B fuses
9.3.3.4 Dielectric properties
9.3.3.4.1 Type tests
26 9.3.3.4.2 Routine tests
9.3.4 Performance under short-circuit conditions

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