CECS: 49-1993 Acceptance regulations for low voltage complete switchgear CECS49:93 CECS: 49-1993 Standard download decompression password: www.bzxz.net

CECS49：93
China Engineering Construction Standardization Association Standard
Code for the reception criterion forlow-voltage switchgear assembliesChina Engineering Construction Standardization Association Standard
Code for the reception criterion forlow-voltage switchgear assembliesCECS49：93
Editor: Tianjin Electric Drive Design InstituteApproval: China Engineering Construction Standardization AssociationEffective Date: June 1, 1994
In order to enable design user units and manufacturers to have common practical guiding acceptance standards when using low-voltage switchgear assemblies, our association entrusted the Electrical Engineering Committee to organize the formulation of the "Low-voltage Switchgear Acceptance Regulations". During the formulation of this regulation, extensive research was carried out, and the opinions of relevant units and experts were solicited many times. Finally, it was reviewed and finalized by the Electrical Engineering Committee.
The "Acceptance Regulations for Low Voltage Complete Switchgear" CECS49:93 is hereby approved and recommended to all relevant units for use. During use, please send your comments and relevant information to Tianjin Electric Drive Design Institute, Ministry of Machinery Industry, No. 2 Bridge, Hedong District, Tianjin, Postal Code: 300180.
China Engineering Construction Standardization Association
September 11, 1993
Acceptance Requirements
Item
Electrical Clearance and Creepage Distance
Insulation Resistance
Dielectric Strength
.0..00.1
Components and Their Installation
.......
Main Circuit Wiring··
Auxiliary Circuit Wiring
f........
Protection against Electric Shock and Protection Circuit
Mechanical Operation
Electrical operation
Accessories and spare parts
Test operation
Acceptance rules,
Acceptance classification·
Acceptance items·
Acceptance basis:
Acceptance implementation·
Quality assurance:
Appendix A
Appendix B
Appendix C
Ordering instructions
Explanation of terms used in this regulation
Introduction to product models of low-voltage switchboard manufacturers Additional instructions
1 General provisions
1.0.1 This regulation is specially formulated to meet the needs of the development of electrical engineering construction, ensure the installation quality and operation safety of low-voltage complete switches (also known as low-voltage complete distribution devices, hereinafter referred to as devices) in electrical engineering, and make unified regulations for the acceptance work at each stage of leaving the factory, delivery and installation test.
1.0.2 The devices selected for electrical engineering design must be produced by manufacturers with device production licenses, or qualified products that have passed ministerial or provincial appraisals. 1.0.3 This regulation applies to devices with an AC rated voltage not exceeding 1200V, a frequency of 50Hz, and a DC rated voltage not exceeding 1650V. 1.0.4 The ordering of devices shall comply with the provisions of Appendix A of this regulation. 1.0.5 In addition to implementing this regulation, the acceptance of devices shall also comply with the provisions of relevant national standards in force.
Acceptance requirements
2.1 Structure
2.1.1 The strength and rigidity of the device shall meet the requirements of normal hoisting, transportation, and operation and electrical action during normal work, and shall meet the requirements of dynamic and thermal stability under short-circuit fault conditions.
2.1.2 The doors on the device shall be able to open and close flexibly, and shall not be painted during opening and closing, and shall not have obvious shaking. For devices used in parallel, the opening and closing of any door shall also meet the above requirements. 2.1.3 The welding of the device structure should be firm, the welds should be smooth and uniform, without weld penetration, cracks, undercuts, spatter, gas, etc., and the weld skin should be removed. 2.1.4 The surface of ferrous metal structural parts should have an anti-rust coating or plating, and fasteners should be galvanized or use other plating with stronger rust resistance. 2.1.5 The spray coating on the outer surface of the device should have good adhesion (the manufacturer should have a paint sample test report): there should be no defects such as wrinkles, flow marks, pinholes, bubbles, impurities, brush marks, and bottom color transparency: the color should be uniform, and when self-tested at 1.0m away from the device without direct sunlight, there should be no obvious color difference between the same batch of devices and devices used in parallel. 2.1.6 The plating of electroplated parts should not have defects such as peeling, shedding, blackening, and rust. 2.17 The allowable deviation of the external dimensions of a small box installed separately should comply with the provisions of Table 2.1.7-1; the tolerance of the verticality of the box should comply with the provisions of Table 2.1.7-2; the plane concave and convex value should not exceed 2mm, and there should be no obvious marks. Measuring tools can be selected according to different sizes, such as vernier calipers, digital rulers, steel rulers, steel tape measures, angle rulers, and plug gauges within the validity period of verification. When it is found that the allowable deviation is exceeded. But it does not exceed 2 times the allowable deviation, it should be scored according to the current national standard "Quality Grading of Lighting Distribution Box Products" to determine whether the device is qualified; when the deviation of any dimension exceeds 2 times the allowable deviation value, it should be determined as unqualified. Unit for single installation
Size range
>300～500
>500～1000
Size range
Allowable deviation of overall dimensions
Allowable deviation
Tolerance of verticality of cabinet (mm)
Box for single installation
≤400
>400～1000bzxz.net
>1000～1600
>1600～2500
>2500～3000
Note: The size range is based on the short side size.
Table 2.1.7-
Table 2.1.7-2
Single cabinet in parallel use
2.1.8 The allowable deviation of the external dimensions of the cabinet and the screen should comply with the provisions of Table 2.1.8-1; the verticality tolerance of the cabinet should comply with the provisions of Table 2.1.7-2; the allowable deviation of the gap between doors and doors and between doors and shells should comply with the provisions of Table 2.1.8-2 and Table 2.1.8-3; the plane concave and convex value should not exceed 3mm per meter, and there should be no obvious marks. The selection of measuring tools and the qualification judgment are the same as those in 2.1.7 of this regulation, but the quality grading standards of the corresponding products should be used for scoring.
Size range
400～1000
Allowable deviation of basic skeleton dimensions of cabinet and panel box
>1000～2000
>2000～3000
Size range
≥1000
Size range
<1000
Single installation
Box
Parallel use
Single box
Fixed installation type door gap allowable deviation (mm)
Uniform difference of the same gap
Table 2.1.8-1
Table 2. 1. 8—2
Parallel gap uniformity
Allowable deviation of the door gap of the withdrawable device (mm) Part
Uniform difference of the same gap
Table 2.1.8—3
Parallel gap uniformity
The protection level of the device shell shall comply with the provisions of its technical conditions, and the protection performance shall comply with the requirements of the current national standard "Classification of Shell Protection Level". ) Each device and each withdrawable functional unit shall have a nameplate. The content of the nameplate shall comply with the provisions of the current national relevant standards. 2.2 Electrical clearance and creepage distance
The electrical clearance and creepage distance between the exposed live conductors of different phases or poles in the device and between them and the uninsulated conductors shall be specified. The electrical clearance and creepage distance inside the electrical components and between their terminals shall comply with the provisions of their technical conditions.
Electrical clearance and creepage distance (mm)
Rated insulation voltage Ui (V)
60
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