Normy

Obsah

ČSN EN 50341-2-13 This NNA (National Normative Annex) is only applicable to all new overhead lines equipped with bare conductors, covered conductors or cables, with voltages above 1kV AC. This standard is not applicable to overhead lines pre-existing before its coming into force and shall not be applied to maintenance or reconductoring; the standard can be applied in case of significant modifications of existing lines.

Obsah

ČSN EN 50341-2-16 This Part 2-16 is applicable for new permanent overhead lines only and generally not for existing lines in Norway. If some planning/design or execution work on existing lines in Norway has to be performed, the degree of application of this Standard shall be agreed upon by the parties concerned and the authorities.

Obsah

ČSN EN 61643-351 Surge isolation transformers (SITs) are used for signal transformer applications with signal levels up to 400 V peak to peak. SITs are transformers, with or without an internal-winding screen, with a rated impulse withstand voltage greater than the peak voltage of the expected common-mode surge environment. SITs are applicable to components for surge protection against indirect and direct effects of lightning or other transient overvoltage. SITs are used to mitigate the onward propagation of common-mode voltage surges. This part of IEC 61643 defines test circuits and test methods for determining and verifying the SIT surge parameters. Preferred performance values for key parameters are given. This part of IEC 61643 does not cover SIT operation under differential-mode lightning surge conditions.

Obsah

ČSN EN 60695-8-1 ed. 3 This part of IEC 60695-8 provides guidance on the measurement and interpretation of heat release from electrotechnical products and materials from which they are constructed. Heat release data can be used as part of fire hazard assessment and in fire safety engineering, as described in IEC 60695-1-11 and IEC 60695-1-12. This basic safety publication is intended for use by technical committees in the preparation of standards in accordance with the principles laid down in IEC Guide 104 and ISO/IEC Guide 51. One of the responsibilities of a technical committee is, wherever applicable, to make use of basic safety publications in the preparation of its publications. The requirements, test methods or test conditions of this basic safety publication will not apply unless specifically referred to or included in the relevant publications.

Obsah

ČSN EN 62739-3 Norma popisuje metodiku výběru příslušné zkušební metody pro hodnocení eroze kovových materiálů s povr-chovým zpracováním nebo bez povrchového zpracování, které jsou určeny pro zařízení pro bezolovnaté pájení vlnou, tj. pro vanu s pájkou a pro další komponenty, které jsou v kontaktu s roztavenou pájkou.

Obsah

ČSN ISO/IEC 25000 ISO/IEC 25000:2014 poskytuje návod pro použití nové řady mezinárodních norem nazvaných Požadavky a hodnocení kvality systémů a softwaru (SQuaRE). Cílem ISO/IEC 25000:2015 je poskytnout obecný přehled o obsahu, obecných referenčních modelech a definicích SQuaRE, stejně jako vztahu mezi dokumenty, umožňujícím uživatelům návodu porozumět této řadě norem, v souladu se záměrem použití. Obsahuje také vysvětlení procesu přechodu mezi původní ISO/IEC 9126 a řadou ISO/IEC 14598 a SQuaRE.

Obsah

ČSN EN ISO 29664 This International Standard describes artificial weathering tests intended to evaluate plastics for use in heavily polluted outdoor environments. Results from this International Standard cannot be used to predict the service life of these plastics. This International Standard describes two different exposure methods. Use of the methods depends on the form of the plastic product being evaluated. Method A is intended for products where surface degradation is very important and uses a strong acid spray (pH 1,5) that is applied for a short time. Method B uses a weaker acid spray (pH 3,5) that is applied over a long period of time so that it can penetrate deeply into the product and is intended for products such as geotextiles and related products. This International Standard does not cover the influence of special chemicals like agrochemicals.

Obsah

ČSN EN 1453-1 Tato část EN 1453 specifikuje požadavky na trubky a potrubní systémy z trubek se strukturovanou stěnou z neměkčeného polyvinylchloridu (PVC-U), určené pro odpadní systémy (pro nízkou a vysokou teplotu) uvnitř budov (kód oblasti použití "B"). Tuto část EN 1453 lze také použít pro trubky a potrubní systémy z trubek se strukturovanou stěnou z neměkčeného polyvinylchloridu (PVC-U), určené pro následující účely: - zavzdušňovací potrubí spojené s odvodem odpadní vody; - potrubí pro odvod dešťové vody uvnitř budov. Tato norma také specifikuje zkušební parametry pro metody uvedené v normách, na které se odkazuje. Tato norma pokrývá rozsah jmenovitých rozměrů trubek a uvádí doporučení týkající se barev. U vnějších nadzemních aplikací by se měly dodatečné požadavky na klimatické podmínky dohodnout mezi výrobcem a uživatelem.

Obsah

ČSN EN ISO 15876-2 This document specifies the characteristics of pipes for polybutene-1 (PB-1) piping systems intended to be used for hot and cold water installations within buildings for the conveyance of water whether or not intended for human consumption (domestic systems), and for heating systems, under design pressures and temperatures appropriate to the class of application (see ISO 15876-1). The designation polybutene is used together with the abbreviation PB throughout this document. This document covers a range of service conditions (application classes), design pressures and pipe dimension classes. For values of TD, Tmax and Tmal in excess of those in ISO 15876-1, this document does not apply. NOTE 1: It is the responsibility of the purchaser or specifier to make the appropriate selections from these aspects, taking into account their particular requirements and any relevant national regulations and installation practices or codes. It also specifies the test parameters for the test methods referred to in this document. In conjunction with the other parts of ISO 15876, this document is applicable to PB pipes, their joints and to joints with components of PB, other plastics and non-plastics materials intended to be used for hot and cold water installations. It is applicable to pipes with or without (a) barrier layer(s). NOTE 2: In the case of plastics pipes provided with a thin barrier layer, e.g. to prevent or greatly diminish the diffusion of gases and the transmission of light into or through the pipe wall, the design stress requirements are totally met by the base polymer (PB).

Obsah

ČSN ISO 21940-11 Tento dokument uvádí postupy a tolerance nevyváženosti pro vyvažování rotorů v tuhém stavu. Stanovuje: a) velikost přípustného zbytkového nevývažku, b) potřebný počet korekčních rovin, c) rozvržení přípustného zbytkového nevývažku do tolerančních rovin, d) jak zohlednit chyby při procesu vyvažování. POZNÁMKA: Podrobné pojednání o odhadu chyb při vyvažování je uvedeno v ISO 21940-14. Základy vyvažování rotoru jsou obsaženy v ISO 19499, která poskytuje úvod do vyvažování. Tento dokument se netýká vyvažování rotorů v pružném stavu. Postupy a tolerance pro rotory v pružném stavu jsou uvedeny v ISO 21940-12.

Obsah

ČSN EN 16845-1 This European Standard specifies a test method for the evaluation of the photocatalytic self-cleaning performance of materials showing photocatalytic activity, usually based on semiconducting metal oxides such as titanium dioxide, by the measurement under solid/solid conditions of the decolouring ability under irradiation with ultraviolet light (UV-A) of a test sample on which a dye solution is sprayed and dried. This European Standard is intended for use with opaque and rough surfaces of different kinds, such as construction materials in flat sheet, board or plate shape, that are the basic forms of materials for various applications. This European Standard also applies to fabric, plastic or composites containing photocatalytic materials that are not soluble in acetone. This European Standard does not apply to photocatalytic glass, granular materials (unless they are deposited in compact films or layers over flat solid surface) and flat non porous materials. The method evaluates only the self-cleaning ability of the material under ultraviolet light irradiation. It cannot be applicable to evaluate other performance attributes of photocatalytic materials, i.e. decomposition of water contaminants in liquid or gas phases contacting the material, and antifogging and antibacterial actions.

Obsah

ČSN EN ISO 20339 This document identifies the functional characteristics of eddy current array probes and their interconnecting elements and provides methods for their measurement and verification. The evaluation of these characteristics permits a well-defined description and comparability of eddy current array probes. Where relevant, this document gives recommendations for acceptance criteria for the characteristics.