Normy

Obsah

ČSN EN IEC 63522-30 This document is used for testing all kinds of electrical relays and for evaluating their ability to perform under expected conditions of transportation, storage and all aspects of operational use. NOTE - Examples for electrical relays in the sense of this document include electromechanical relays, reed relays, reed contacts, reed switches, solid state relays, time relays and technology combinations of these. This document defines a standard test method to determine contact sticking of relays as part of the normal service life, i.e., devices under test (DUTs) fail to open within a specified time, due to, for example, effects of remanence, chemical effects, or high temperature. It does not cover contact sticking during or after electrical endurance testing or due to other validation tests for relays.

Obsah

ČSN EN IEC 60335-2-28 ed. 3 Tato norma se zabývá bezpečností elektrických šicích strojů pro domácnost a podobné použití, jejichž jmenovité napětí nepřesahuje 250 V u jednofázových spotřebičů a 480 V u ostatních spotřebičů včetně spotřebičů napájených stejnosměrným proudem (DC) a spotřebičů na baterie. V rozsahu platnosti této normy jsou obnitkovací stroje a elektrické soupravy.

Obsah

ČSN EN ISO 16795 This document specifies a method which covers the determination of Gd2O3 content in UO2 fuel pellets, by X-ray fluorescence spectrometry. Either wave dispersion X-ray fluorescence (WD-XRF) or energy dispersion X-ray fluorescence (ED-XRF) is applicable, however, this document states a method by using WD-XRF using Gd La-line. This method has been tested for mass fractions of from 2 % to 10 % Gd2O3.

Obsah

ČSN EN ISO 877-2 This document specifies a method for the direct exposure of plastics to solar radiation (method A) and a method for the exposure of plastics to glass-filtered solar radiation (exposure behind window glass) (method B). The purpose is to assess property changes produced after specified stages of such exposures. General guidance concerning the scope of the ISO 877 series[1] is given in ISO 877-1.

Obsah

ČSN EN ISO 3386-1 This document specifies a method for the determination of the compression stress/strain characteristics of low-density flexible cellular materials up to 250 kg/m3. It also specifies a method for the calculation of the compression stress value of such materials.

Obsah

ČSN EN 18064-1 This document is the general part of the series that describes the designation system for plastic recyclates. This document is dealing with recyclates after the recycling operation and prior to converting and compounding (when applicable). It is dealing with preparation of samples and determination of properties. NOTE 1 - This document supports the underlaying standards of this series that, per polymer type, provide an overview of the relevant characteristics and typical values for recyclates for use in certain application groups (product families) in combination with the relevant converting technologies. NOTE 2 - The overview of the relevant properties is based on and further extends the relevant properties given in EN ISO 10350-1.

Obsah

ČSN ISO 9854-2 Tento dokument specifikuje hodnoty nebo podmínky zvolené pro zkušební parametry (tj. rázovou energii, rozměry zkušebního tělesa, typ zkušebního tělesa, podpěry zkušebního tělesa a zkušební teplotu) tělesa s vrubem i bez vrubu použitého pro zkoušení rázové odolnosti trubek z termoplastů (metodou rázového kyvadla) pro následující materiály v souladu s ISO 9854-1. Je určena pro trubky z neměkčeného polyvinylchloridu (PVC-U), rázově houževnatého polyvinylchloridu (PVC-HI), orientovaného neměkčeného polyvinylchloridu (PVC-O), chlorovaného polyvinylchloridu (PVC-C), akrylonitrilbutadienstyrenu (ABS), akrylonitrilstyrenakrylátu (ASA), homopolymeru propylenu (PP-H), rázově houževnatého polymeru propylenu (PP-B), náhodného kopolymeru propylenu (PP-R), náhodného kopolymeru propylenu s modifikovanou krystalinitou (PP-RCT) a polyethylenu (PE).

Obsah

ČSN EN 16997 This document specifies a wavelength-dispersive X-ray fluorescence (WDXRF) test method for the determination of the sulfur content in ethanol (E85) automotive fuel, containing ethanol between 50 % (V/V) and 85 % (V/V), from 5 mg/kg to 20 mg/kg, using instruments with either monochromatic or polychromatic excitation.

Obsah

ČSN EN 18070 This document specifies a test method for comparing the compression shear strength of adhesive bonds in wood and solid wood after exposure to a target temperature for a specified duration of time. This document is applicable to adhesives used in load bearing timber structures. This document is not applicable to Epoxy- and two component Polyurethane-adhesives. This method is intended to obtain data for the performance of wood adhesives at very high temperatures. The result of this comparison can be used to classify the adhesive with regard to the behaviour of load-bearing timber structures in fire.

Obsah

ČSN P CEN/TS 12697-52 This document specifies two sets of procedures for conditioning of bituminous mixtures in terms of oxidative ageing. Procedures A.1 and A.2 can be applied on loose bituminous mixture before compaction of specimens, procedures B.1 and B.2 on compacted specimens. Material conditioned by this document can be used for further testing to assess the effect of oxidative ageing on characteristics of bituminous mixtures and thus on their durability and recyclability. Alternatively, binder can be extracted from conditioned mixture to assess the effect of oxidative ageing on binder characteristics taking into account potential effects of mineral aggregates on ageing. This document is applicable to bituminous mixtures manufactured in the laboratory or in a mixing plant. Procedures B.1 and B.2 are applicable to specimens from laboratory production or samples taken from the field.

Obsah

ČSN EN 13079 This document specifies the characteristics and the requirements of air gap with injector Family A, Type D for nominal flow velocity not exceeding 3 m/s. Air gaps are devices for protection of potable water in water installations from pollution by backflow. This document is applicable to air gaps in factory-assembled products and to constructed air gaps in situ and specifies requirements and methods to verify and ensure compliance with this document during normal working use. The fluid in the receiving vessel is assumed to have similar properties to the water supply. Where this is not the case, additional care or tests can be required to verify the efficacy of the solution in practical use. The AD device is intended to be used in potable water installations according to EN 806 (all parts).

Obsah

ČSN EN ISO 7979 This document specifies methods for determining the fastness of the surface of leather to hydroalcoholic mixtures. It is applicable to all kinds of leather.