GB/Z 25842.1-2010Low-voltage switchgear and controlgear - Overcurrent protective devices - Part 1: Application of short-circuit ratings (English PDF)

Foreword

GB /Z 25842 "low-voltage switchgear and control equipment over-current protection electrical" is divided into two parts.

--- Part 1. The application of short-circuit fixed;

--- Part 2. Over-current conditions of selectivity. This section GB /Z 25842 Part 1.

This section identical with IEC /T R61912-1.2007 "Low-voltage switchgear and control equipment over-current protection Part 1.

Short-circuit quota application "(in English). For ease of use, this section made the following editorial changes.

--- Remove the foreword of the international standard;

--- "This report" to "this section";

--- "List of 3 definitions and characteristics in alphabetical order" should read "3 Definitions and characteristics index". Appendix A of this section is informative appendix.

Introduction

GB 14048 and GB 7251 are currently on the electrical switch and complete sets of equipment were provided for the short-circuit quota, the quota according to equipment in a peak The value current level, the current rms for a specified time and/or a current level dependent on the series connected short-circuit protection Depending on ability. In fact circuit designers need to fully understand the various short-circuit quota and can be properly applied to avoid the circuit or device Improper short-circuit protection while maximizing equipment and system capacity to avoid additional waste.

1 Scope

This part of GB /Z 25842 as a low-voltage switchgear and control equipment and complete sets of equipment standard short-circuit the application guidelines, summarized The definition of short-circuit quotas, and its application to provide the corresponding examples.

Note: This section does not itself involve the installation of household appliances.

2 Normative references

The provisions of the following documents through the provisions of this part of GB /Z 25842 cited as the provisions of this section. Any reference to the date of the citation Pieces, all subsequent amendments (not including errata content) or revisions do not apply to this section, however, to encourage the agreement reached under this section The parties studied whether the latest versions of these documents are available. For undated references, the latest version applies to this section.

GB 7251.1 Low-voltage switchgear and controlgear - Part 1. Type test and part type test equipment (GB 7251.1-2005, IEC 60439-1:1999, IDT)

GB 7251.2 Low-voltage switchgear and controlgear assemblies - Part 2. Particular requirements for busbar system (busbar) (GB 7251.2-2006, IEC 60439-2:2000, IDT)

GB 10963.1 Electrical Accessories Overcurrent protective circuit breakers for household and similar places - Part 1. Circuit breakers for communication (GB 10963.1-2005, IEC 60898-1:2002, IDT)

GB 13539.1 low-voltage fuses Part 1. Basic requirements (GB 13539.1-2008, IEC 60269-1:2006, IDT)

GB 14048.1 low-voltage switchgear and control equipment Part 1. General (GB 14048.1-2006, IEC 60947-1:2001, MOD)

Low - voltage switchgear and controlgear - Part 2. Circuit breakers (GB 14048.2-2008, IEC 60947-2. 2006, IDT)

GB 14048.3 Low-voltage switchgear and controlgear - Part 3. Switches, isolators, disconnectors and fusegearders (GB 14048.3-2008, IEC 60947-3:2005, IDT)

GB 14048.4 Low-voltage switchgear and controlgear Electromechanical contactors and motor starters (GB 14048.4-2010, IEC 60947-4-1:2009, MOD)

GB 14048.9 Low-voltage switchgear and control equipment Part 6-2. Multi-function electrical (equipment) control and protection switch electrical equipment Prepared) (CPS) (GB 14048.9-2008, IEC 60947-6-2:2007, IDT)

GB/T 14598 (all parts) Electrical relays (IEC 60255 (all parts), IDT)

GB 16895 (all parts) Electrical installations of buildings (IEC 60364 (all parts), IDT)

GB 16917.1 residual current operated circuit breakers (RCBO) with overcurrent protection for household and similar purposes Part 1. General Rules (GB 16917.1-2003, IEC 61009-1:2003, MOD)

3 Definitions and characteristics of the index

Definition and characteristics of the corresponding terms of the name Expected short circuit current Icp 4 Short circuit current peak Ip 4