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GB/T 2423.37-2006 English PDF (GBT2423.37-2006)

GB/T 2423.37-2006 English PDF (GBT2423.37-2006)

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GB/T 2423.37-2006: Environmental testing for electric and electronic products - Part 2: Test methods - Test L: Dust and sand

GB/T 2423.37-2006
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 19.040
K 04
GB/T 2423.37-2006 / IEC 60068-2-68:1994
Replacing GB/T 2423.37-1989
Environmental Testing for Electric and Electronic
Products - Part 2: Test Methods - Test L: Dust and
Sand
(IEC 60068-2-68:1994, Environmental
Testing – Part 2: Tests – Test L: Dust and Sand, IDT)
ISSUED ON: DECEMBER 19, 2006
IMPLEMENTED ON: SEPTEMBER 01, 2007
Issued by: General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
Introduction ... 4
1 General ... 5
2 Normative References ... 6
3 Terms and Definitions ... 6
4 Test La: Non-Abrasive Fine Dust ... 7
5 Test Lb: Free Settling Dust ... 27
6 Test Lc: Blown Dust and Sand ... 38
Annex A (Informative) General Guidance ... 60
A.1 Characteristics of test dust... 60
A.2 Other dusts ... 62
A.3 Effect of humidity on test dust ... 63
A.4 Effects on electrotechnical products ... 63
A.5 Safety precaution ... 66
A.6 Test L and IEC 60529 comparison ... 67
Annex B (Informative) Bibliography ... 70
Foreword
GB/T 2423 Environmental Testing – Part 2: Test Methods consists of several parts. This Part is Part 37 of GB/T 2423. This Part equivalently adopts IEC 60068-2-68:1994 Environmental Testing – Part 2: Tests – Test L: Dust and Sand (English Edition). Compared with the international standard, this Part makes the following editorial modifications:
--- Delete the foreword of the international standard;
--- Add the foreword of the national standard;
--- Use the corresponding national standard to replace the international standard; --- Use the NOTE of 3.7 directly into the standard compilation.
This Part replaced GB/T 2423.37-1989; the differences between this Part and GB/T 2423.37-1989 are as follows:
--- Divide Test La into Tests La1 and La2; change the test conditions;
--- Add test method Lc2;
--- Add test guidance after the test methods.
The Annexes A and B of this Part are informative.
This Part was proposed by China Electrical Equipment Industry Association. This Part shall be under the jurisdiction of National Technical Committee on Environmental Technologies of Electric and Electronic Products of Standardization Administration of China (SAC/TC 8).
Drafting organization of this Part: Guangzhou Electric Apparatus Research Institute. Chief drafting staffs of this Part: Yan Jinglian.
The historical edition replaced by this Standard is as follows: GB/T 2423.37-1989. Environmental Testing for Electric and Electronic
Products - Part 2: Test Methods - Test L: Dust and
Sand
1 General
This survey indicates the general structure of the dust/sand tests included in this Part. The structuring and a summary of the characteristics of the different tests are given in Figure 1 and Table 1. It should be noted that the dust test of IEC 60529 has its equivalent in the proposed method La2. See also Annex A.
1.1 Scope
This Part specifies test methods to determine the effects of dust and sand suspended in air, on electrotechnical products.
The test methods of this standard are not intended for the testing of air filters. Only method Lc2 is suitable for the simulation of the erosion effects of high velocity (more than 100 m/s) particles.
1.2 Description of Test L
The dust and sand tests are structured into three groups:
La: non-abrasive fine dust. A test which is primarily oriented towards investigation of the seals of the test specimen. The test specimen is exposed to a very fine dust in the form of talc or an equivalent. The effects of temperature cycling resulting in a pressure difference between the inside and outside of the specimen may be reproduced.
Lb: free settling dust. A test which is oriented towards investigation of the effects when simulating conditions at sheltered locations. The test specimen is exposed to a low-density dust atmosphere created by the intermittent injection of a small quantity of dust which is allowed to fall by gravity onto the specimen. Lc: blown dust and sand. A test which is oriented towards investigation of the seals and the effect of erosion when simulating outdoor and vehicle conditions. The test specimen is exposed to either a turbulent or a laminar air flow to which is added a quantity of dust, sand or a dust/sand mixture.

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