Detail of GB/T 37977.41-2024

Introduction of GB/T 37977.41-2024

GB/T 37977.41-2024 Electrostatics - Part 4-1: Standard test methods for specific applications - Electrical resistance of floor coverings and installed floors 1 Scope This part of GB/T 37977 specifies test methods for determining the electrical resistance of all types of floor coverings and installed floors with resistance to ground, point-to-point resistance and vertical resistance of between 104 Ω and 1013 Ω. Laboratory evaluations carried out under controlled environmental conditions can be used for classification or quality control purposes. Tests on installed floors under uncontrolled ambient conditions can be used to determine correct installation or as part of an ongoing system verification. Note: Although this standard does not include requirements for personal safety, attention is drawn to the fact that all concerned might need to comply with the relevant local statutory requirements regarding the health and safety of all persons in all places of work that use floor coverings defined by the test method of this standard. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 1957 Machine-made textile floor coverings - Selection and cutting of specimens for physical tests 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 acceptance testing testing carried out on flooring immediately after installation or on production samples prior to initial acceptance by the customer 3.2 geometric mean nth root of the product of n numbers 3.3 groundable point attachment to a floor covering that facilitates its connection to ground 3.4 insulating material material having a vertical resistance greater than 1014 Ω 3.5 laboratory evaluations measurements carried out under controlled laboratory conditions 3.6 resistance to ground electrical resistance measured between ground or a groundable point and a single electrode placed on the use-surface 3.7 point-to-point resistance electrical resistance measured between two electrodes placed on the use-surface 3.8 vertical resistance electrical resistance measured between the counter-electrode on the back of the material under test and a single electrode placed on the use-surface 4 Principle The resistance across the use-surface of the test material and through the test material is measured using a high-resistance meter, or other suitable equipment. Point-to-point resistance measurements are appropriate for evaluating a floor covering’s ability to conduct charge across its use-surface or to act as a charge sink. Measurements of resistance through floor coverings, i.e. resistance to ground and vertical resistance, are appropriate for evaluating their ability to conduct charge from the use-surface or from conductors in contact with the use-surface, to a charge sink beneath the floor covering. A simulation of the resistance-to-ground measurement is made under laboratory conditions by attaching a groundable point to the back of the floor covering under test.

Contents of GB/T 37977.41-2024