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GB 7251.1-2013 English PDF (GB7251.1-2013)
GB 7251.1-2013 English PDF (GB7251.1-2013)
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Delivery: 3 seconds. Download true-PDF + Invoice.Newer version: (Replacing this standard) GB/T 7251.1-2023
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GB 7251.1-2013: [GB/T 7251.1-2013] Low-voltage switchgear and controlgear assemblies -- Part 1: General rules
GB 7251.1-2013
Low-voltage switchgear and controlgear assemblies.Part 1. General rules
ICS 29.130
K31
National Standards of People's Republic of China
Replacing GB 7251.1-2005
Low-voltage switchgear and control equipment
Part 1. General
Part 1. Generalrules
(IEC 61439-1.2011, IDT)
Published 2013-12-31
2015-01-13 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China issued
Table of Contents
Preface Ⅶ
Introduction Ⅹ
1 Scope 1
2 Normative References 1
3 Terms and definitions 4
4 3.1 generic term
3.2 Equipment configuration unit 5
Shape design equipment 6 3.3
3.4 Equipment structural member 7
3.5 Equipment mounting condition 8
3.6 insulating properties 8
10 3.7 Protection against electric shock
3.8 Characteristics 12
3.9 Verify 14
3.10 Manufacturer/user 15
Symbols and abbreviations 4 15
5 Interface Features 16
5.1 General 16
5.2 Rated voltage data 16
Current nominal data 16 5.3
5.4 nominal scattering coefficient (RDF) 17
5.5 rated frequency (fn) 17
5.6 Other features 18
6 information 18
Marks under 6.1 Equipment 18
6.2 file 18
6.3 identification devices and/or elements 19
7 Conditions 19
7.1 normal conditions of use 19
20 7.2 Special conditions of use
7.3 Transportation, storage and installation conditions 20
8 structural requirements 21
8.1 Materials and strength member 21
8.2 degree of protection equipment housing 22
8.3 clearances and creepage distances 22
23 8.4 Protection against electric shock
8.5 switching device combination and element 28
8.6, and the internal circuit 29 is connected
8.7 Cooling 31
An external lead terminal 31 8.8
9 Performance requirements 32
32 9.1 Dielectric Properties
9.2 temperature limit 32
9.3 Short-circuit protection and short-circuit withstand strength 33
9.4 Electromagnetic compatibility (EMC) 34
10 34 Design Verification
10.1 General 34
10.2 Materials and strength member 35
Protection level equipment 38 10.3
10.4 clearances and creepage distances 38
10.5 shock protection and integrity protection circuit 38
And combinations of elements of the switching device 10.6 39
Internal circuitry and connections 39 10.7
External lead terminals 39 10.8
10.9 40 Dielectric Properties
10.10 temperature rise verification 42
49 short-circuit withstand strength 10.11
10.12 Electromagnetic compatibility (EMC) 54
10.13 mechanical operation 54
11 54 Routine Tests
11.1 General 54
11.2 the housing 54 degree of protection
11.3 clearances and creepage distances 55
11.4 Protection against electric shock and protection circuit integrity 55
A combination of elements 55 built 11.5
Internal circuitry and connections 55 11.6
11.7 external lead terminal 55
11.8 mechanical operation 55
11.9 Dielectric properties 55
11.10 wiring, operational performance and functionality 55
Annex A (normative) suitable for connecting the outer conductor terminal with the smallest and largest cross-sectional area of copper wires (see 8.8) 63
Annex B (normative) in short-time current due to thermal stress, the method of calculating the conductor cross-sectional area of protection 64
Annex C (informative) user information template 65
Annex D (informative) design verification 69
Annex E (informative) Rated dispersion coefficient 70
E.1 General 70
E.2 rated equipment scattering coefficient 70
A group of line circuits rated E.3 dispersion coefficient 70
E.4 nominal dispersion coefficient and intermittent duty 74
Measurement Appendix F (normative) clearances and creepage distances 76
The basic principle F.1 76
F.2 Use of ribs 76
Relationship between nominal voltage rating of the device (normative) Appendix G of the power supply system 81 of the impulse withstand voltage
Annex H (normative) the operating current and power loss of copper wire 82
Appendix I (empty) 84
Annex J (normative) Electromagnetic compatibility (EMC) 85
J.1 General 85
J.2 terms and definitions 85
(Normative) electrical isolation protection Appendix K 90
K.1 General 90
K.2 electrical isolation 90
K.3 Class II or equivalent insulation device 91
Annex L (informative) clearances and creepage distances in North America 92
Annex M (informative) North American temperature rise limit of 93
Annex N (normative) bare copper busbar operating current and power loss 94
Annex O (informative) temperature rise test Guide 96
O.1 General 96
O.2 temperature limit 96
O.3 test 96
Calculation O.4 98
O.5 Design Rule 98
Annex P (normative) verified by calculating the short-circuit withstand strength reference bus configuration design is already tested 100
P.1 General 100
Terms and definitions 100 P.2
P.3 authentication method 101
P.4 application conditions 101
Reference 103
Typical equipment 71 of FIG E.1
Example E.2 Table E.1 FIG polydispersity index of 0.8 the rated equipment load functional unit 172
FIG E.3 Table E.1 rated equipment is an example of the dispersion coefficient of the functional units 272 0.8 load
FIG example E.4 Table E.1 polydispersity index of 0.8 the rated equipment load functional unit 373
FIG E.5 Table E.1 rated equipment is an example of the dispersion coefficient of the functional units 473 0.8 load
Calculating an average thermal effects E.6 Example 74 FIG.
FIG E.7 same RDF and intermittent duty, at t1 = 0.5s, diagram parameters I1 = 7I2 different cycle times Example 75
Parameter relationship diagram when the RDF E.8 same intermittent duty, (not started over current) I1 = I2 Example 75
FIG measured ribs 76 F.1
Example J.1 port 85 of FIG.
FIG temperature authentication method O.1 99
FIG P.1 bus structures have been tested (TS) 100
FIG P.2 untested bus structure (NTS) 101
FIG P.3 corner of a support member 102 of the corner bus bar
Table 1 minimum electrical clearance air in a (8.3.2) 56
Table 2 minimum creepage distance (8.3.3) 56
Table 3 copper protective conductor cross-sectional area (8.4.3.2.2) 57
Table 4 conductor selection and installation requirements (8.6.4) 57
Table 5 Minimum copper protective conductor cross-sectional area (PE, PEN) (8.8) 57
Table 6 temperature limit (9.2) 58
na coefficient values in Table 7 (9.3.3) 59
Table 8 frequency withstand voltage of the main circuit (10.9.2) 59
TABLE auxiliary circuit 9 and the control circuit power frequency voltage withstand value (10.9.2) 59
Table 10 Test impulse withstand voltage (10.9.3) 59
Table 11 for the rated current of 400A with copper wire test (10.10.2.3.2) 60
Table 12 Test for the rated current of copper wires of 400A ~ 4000A (10.10.2.3.2) 61
Table 13 by comparison with a baseline short circuit design verification. checklist (10.5.3.3,10.11.3 and 10.11.4) 61
Table 14 Relationship between the prospective fault current wire diameter 62
Table A.1 copper wire cross-sectional area for connecting the outer conductor terminal 63
Table B.1 k value of the insulation is not included in the protective conductor of the cable, the cable jacket, or the bare protective conductor contact k value 64
Table C.1 Template 65
Table D.1 to be completed design verification list 69
Table E.1 rated polydispersity index of 0.8 to load equipment Example 71
Examples of a group of load circuits (cabinet unit B in FIG E.1) Table E.2 rated polydispersity index of 0.9 to 74
Examples of a group of load circuits (sub...
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GB 7251.1-2013: [GB/T 7251.1-2013] Low-voltage switchgear and controlgear assemblies -- Part 1: General rules
GB 7251.1-2013
Low-voltage switchgear and controlgear assemblies.Part 1. General rules
ICS 29.130
K31
National Standards of People's Republic of China
Replacing GB 7251.1-2005
Low-voltage switchgear and control equipment
Part 1. General
Part 1. Generalrules
(IEC 61439-1.2011, IDT)
Published 2013-12-31
2015-01-13 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China issued
Table of Contents
Preface Ⅶ
Introduction Ⅹ
1 Scope 1
2 Normative References 1
3 Terms and definitions 4
4 3.1 generic term
3.2 Equipment configuration unit 5
Shape design equipment 6 3.3
3.4 Equipment structural member 7
3.5 Equipment mounting condition 8
3.6 insulating properties 8
10 3.7 Protection against electric shock
3.8 Characteristics 12
3.9 Verify 14
3.10 Manufacturer/user 15
Symbols and abbreviations 4 15
5 Interface Features 16
5.1 General 16
5.2 Rated voltage data 16
Current nominal data 16 5.3
5.4 nominal scattering coefficient (RDF) 17
5.5 rated frequency (fn) 17
5.6 Other features 18
6 information 18
Marks under 6.1 Equipment 18
6.2 file 18
6.3 identification devices and/or elements 19
7 Conditions 19
7.1 normal conditions of use 19
20 7.2 Special conditions of use
7.3 Transportation, storage and installation conditions 20
8 structural requirements 21
8.1 Materials and strength member 21
8.2 degree of protection equipment housing 22
8.3 clearances and creepage distances 22
23 8.4 Protection against electric shock
8.5 switching device combination and element 28
8.6, and the internal circuit 29 is connected
8.7 Cooling 31
An external lead terminal 31 8.8
9 Performance requirements 32
32 9.1 Dielectric Properties
9.2 temperature limit 32
9.3 Short-circuit protection and short-circuit withstand strength 33
9.4 Electromagnetic compatibility (EMC) 34
10 34 Design Verification
10.1 General 34
10.2 Materials and strength member 35
Protection level equipment 38 10.3
10.4 clearances and creepage distances 38
10.5 shock protection and integrity protection circuit 38
And combinations of elements of the switching device 10.6 39
Internal circuitry and connections 39 10.7
External lead terminals 39 10.8
10.9 40 Dielectric Properties
10.10 temperature rise verification 42
49 short-circuit withstand strength 10.11
10.12 Electromagnetic compatibility (EMC) 54
10.13 mechanical operation 54
11 54 Routine Tests
11.1 General 54
11.2 the housing 54 degree of protection
11.3 clearances and creepage distances 55
11.4 Protection against electric shock and protection circuit integrity 55
A combination of elements 55 built 11.5
Internal circuitry and connections 55 11.6
11.7 external lead terminal 55
11.8 mechanical operation 55
11.9 Dielectric properties 55
11.10 wiring, operational performance and functionality 55
Annex A (normative) suitable for connecting the outer conductor terminal with the smallest and largest cross-sectional area of copper wires (see 8.8) 63
Annex B (normative) in short-time current due to thermal stress, the method of calculating the conductor cross-sectional area of protection 64
Annex C (informative) user information template 65
Annex D (informative) design verification 69
Annex E (informative) Rated dispersion coefficient 70
E.1 General 70
E.2 rated equipment scattering coefficient 70
A group of line circuits rated E.3 dispersion coefficient 70
E.4 nominal dispersion coefficient and intermittent duty 74
Measurement Appendix F (normative) clearances and creepage distances 76
The basic principle F.1 76
F.2 Use of ribs 76
Relationship between nominal voltage rating of the device (normative) Appendix G of the power supply system 81 of the impulse withstand voltage
Annex H (normative) the operating current and power loss of copper wire 82
Appendix I (empty) 84
Annex J (normative) Electromagnetic compatibility (EMC) 85
J.1 General 85
J.2 terms and definitions 85
(Normative) electrical isolation protection Appendix K 90
K.1 General 90
K.2 electrical isolation 90
K.3 Class II or equivalent insulation device 91
Annex L (informative) clearances and creepage distances in North America 92
Annex M (informative) North American temperature rise limit of 93
Annex N (normative) bare copper busbar operating current and power loss 94
Annex O (informative) temperature rise test Guide 96
O.1 General 96
O.2 temperature limit 96
O.3 test 96
Calculation O.4 98
O.5 Design Rule 98
Annex P (normative) verified by calculating the short-circuit withstand strength reference bus configuration design is already tested 100
P.1 General 100
Terms and definitions 100 P.2
P.3 authentication method 101
P.4 application conditions 101
Reference 103
Typical equipment 71 of FIG E.1
Example E.2 Table E.1 FIG polydispersity index of 0.8 the rated equipment load functional unit 172
FIG E.3 Table E.1 rated equipment is an example of the dispersion coefficient of the functional units 272 0.8 load
FIG example E.4 Table E.1 polydispersity index of 0.8 the rated equipment load functional unit 373
FIG E.5 Table E.1 rated equipment is an example of the dispersion coefficient of the functional units 473 0.8 load
Calculating an average thermal effects E.6 Example 74 FIG.
FIG E.7 same RDF and intermittent duty, at t1 = 0.5s, diagram parameters I1 = 7I2 different cycle times Example 75
Parameter relationship diagram when the RDF E.8 same intermittent duty, (not started over current) I1 = I2 Example 75
FIG measured ribs 76 F.1
Example J.1 port 85 of FIG.
FIG temperature authentication method O.1 99
FIG P.1 bus structures have been tested (TS) 100
FIG P.2 untested bus structure (NTS) 101
FIG P.3 corner of a support member 102 of the corner bus bar
Table 1 minimum electrical clearance air in a (8.3.2) 56
Table 2 minimum creepage distance (8.3.3) 56
Table 3 copper protective conductor cross-sectional area (8.4.3.2.2) 57
Table 4 conductor selection and installation requirements (8.6.4) 57
Table 5 Minimum copper protective conductor cross-sectional area (PE, PEN) (8.8) 57
Table 6 temperature limit (9.2) 58
na coefficient values in Table 7 (9.3.3) 59
Table 8 frequency withstand voltage of the main circuit (10.9.2) 59
TABLE auxiliary circuit 9 and the control circuit power frequency voltage withstand value (10.9.2) 59
Table 10 Test impulse withstand voltage (10.9.3) 59
Table 11 for the rated current of 400A with copper wire test (10.10.2.3.2) 60
Table 12 Test for the rated current of copper wires of 400A ~ 4000A (10.10.2.3.2) 61
Table 13 by comparison with a baseline short circuit design verification. checklist (10.5.3.3,10.11.3 and 10.11.4) 61
Table 14 Relationship between the prospective fault current wire diameter 62
Table A.1 copper wire cross-sectional area for connecting the outer conductor terminal 63
Table B.1 k value of the insulation is not included in the protective conductor of the cable, the cable jacket, or the bare protective conductor contact k value 64
Table C.1 Template 65
Table D.1 to be completed design verification list 69
Table E.1 rated polydispersity index of 0.8 to load equipment Example 71
Examples of a group of load circuits (cabinet unit B in FIG E.1) Table E.2 rated polydispersity index of 0.9 to 74
Examples of a group of load circuits (sub...
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