Category: EN standards

4.2.2 Supply voltage variations 4.2.2.1 Requirements Under normal operating conditions excluding the periods with interruptions, supply voltage variations should not exceed ± 10 % of the nominal voltage U n . In cases of electricity supplies in networks not interconnected with transmission systems or for special remote network users, voltage variations should not exceed + 10 % / – 15 […]

1 Scope This European Standard is applicable to ceramic and resin insulated bushings having highest voltages above 1 kV up to 52 kV, rated currents from 250 A up to 3 150 A and frequencies from 15 Hz up to 60 Hz for insulating liquid filled transformers. This standard establishes essential dimensions, to ensure interchangeability of bushings and to ensure […]

4.1.1.1 Test assembly The test assembly shall be so arranged and designed that the protection against direct contact is secured by insulation of live parts, covers, enclosures, obstacles or safe distances. A safe distance is ensured, when the person carrying out the tests cannot reach the prohibition zone with parts of his/her body or tools. Safety can also be satisfied […]

1 Scope This product standard applies to devices operating within the frequency range 0 Hz to 300 GHz, used in electronic article surveillance (EAS), radio frequency identification (RFID) and similar applications. This product standard may be used for demonstration of compliance to the requirements of the RTTE Directive 1999/5/EC, with regard to the limitation of human exposure to electromagnetic fields […]

1 Scope This basic standard applies to radio base stations and fixed terminal stations for wireless telecommunication systems as defined in Clause 4, operating in the frequency range 110 MHz to 40 GHz. The objective of the standard is to specify, for such equipment, the method for assessment of compliance distances according to the basic restrictions (directly or indirectly via […]

1 Scope This European Standard specifies requirements for the construction, testing and performance of electronic portable and transportable apparatus for the detection and measurement of carbon dioxide (CO 2 ) and/or carbon monoxide (CO) in indoor ambient air, which includes air entering mechanical ventilation systems in domestic residential, commercial and industrial premises and public buildings. This European Standard includes indoor […]

5 Safety 5.1 Electrical safety 5.1.1 General 5.1.1.1 Introduction The Road Traffic Signal System shall conform to HD 384.4 series. This subclause deals with the additional requirements for Road Traffic Signal Systems. 5.1.1.2 Criteria − Leakage current 5.1.1.2.1 Road Traffic Signal Systems Class T1: For Road Traffic Signal Systems, leakage current protection facilities conforming to HD 384.4.41 shall be fitted. […]

4 Information and instructions for use 4.1 Information to be provided on or with the ex ternal power supply The i nf orm ation below shall either be marked on eac h externa l power supply or contained in documentatio n provided with eac h external powe r supply: • rated output voltage, in V, • symbo l ind ica […]

1 Scope This International Standard applies to non-insulated flat quick-connect terminations consisting of a male tab of size 2,8 mm, 4,8 mm, 6,3 mm or 9,5 mm with hole or dimple detents and a mating female connector for use as either an incorporated or an integrated part of an equipment or of a component, or as a separate entity. This […]

1 Scope This International Standard specifies the requirements for testing items of equipment intended for use on railway vehicles which are subsequently subjected to vibrations and shock owing to the nature of railway operational environment. To gain assurance that the quality of the equipment is acceptable, it has to withstand tests of reasonable duration that simulate the service conditions seen […]