BS EN 61439-1 PDF

date BS EN is withdrawn and BS EN and BS EN In addition IEC and IEC have been amended, clarified and. For each type of electrical AssEMBLY only two parts of the standard are necessary to determine all requirements: the basic standard IEC “ General rules. What changes does BS EN bring? • New testing procedure including design and routine verification. • Alternative testing routes. • Clear requirements for.

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For voltages which are within the tolerance band stated in IECthe disconnecting time appropriate to the nominal voltage applies. NOTE 3 The value of the supply voltage may exceed the rated voltage due to permissible system tolerances. Where the enclosure is subjected to the test it shall be mounted as for normal use according to the original manufacturer’s instructions.

The requirements are that any insulation material used to support current carrying parts must be able to withstand a glow-wire test at o C. Busbar section loading is indicated by the figure in brackets e. NOTE 3 614399-1 is the value to which dielectric test voltages and creepage distances are referred, see also 8.

BS EN 低压开关设备和控制设备装配模块.电源开关设备和控制设备装配模块 – MBA智库文档

Different values of I for different durations e. Samples shall not show cracks or deterioration visible to normal or corrected vision without additional magnification. The mechanical operation of removable parts, including any insertion interlock, shall be verified by test according to For undated references, the latest edition of the referenced document including any amendments applies.

If several or all circuits of an ASSEMBLY are loaded simultaneously then the same circuit is only able to carry its rated current multiplied with the rated diversity factor see 5. The specimen is considered to have withstood the glow-wire test if — there is no visible flame and no sustained glowing, or if — flames and glowing of the specimen extinguish within 30 s after removal of the glow-wire.

For each functional unit the power loss is calculated at the maximum possible current using the data given by the device manufacturer for each device together with the power losses of the associated conductors.

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A version in any other language made by translation under the responsibility of a CENELEC member 6139-1 its own language and notified to the Central Secretariat has the same status as the official versions. The terminals shall be such that the external conductors may ba connected by a means screws, connectors, etc.

NOTE This measure is intended to prevent the appearance of dangerous voltage on the accessible parts of 6439-1 equipment through a fault in the basic insulation. For the test carried out in accordance with ISO no grooves shall be cut into the sample and the impact shall be applied to the exposed surface.

Scope of the standard – IEC – Siemens

NOTE 1 The rated current of a circuit may be lower than the rated currents of the devices according to the respective device standard installed in this circuit. In such cases when the control of overvoltages is achieved by means other than surge arresters, guidance for the correlation between the enn supply system voltage and the equipment rated impulse withstand voltage is given in IEC Locations which are characterised by being supplied directly at low voltage from the public mains network are considered to be residential, commercial or light-industrial.

Please download Chrome or Firefox or view our browser tips. Circuit protection devices shall be selected to ensure adequate protection to outgoing e, e. Introduction to You are here: Such conductors shall fn be connected to the protective conductors or exposed-conductive-parts of other circuits or to any extraneous conductive parts.

BS EN 61439-1:2011

These interconnections may be achieved either by metal screwed connections, welding or other conductive connections or by a separate protective conductor.

Learn more about the cookies we use and how to change your settings. This test need not be made on auxiliary circuits: Accept and continue Learn more about the cookies we use and how to change your settings.

When the protective device in the outgoing circuit is a circuit-breaker, the test circuit may include a shunting resistor in accordance with 8. NOTE 1 Where the frame is used as a protective conductor, sparks and localized heating at joints are permitted, provided they do not impair the electrical continuity and provided that adjacent bbs parts are not ignited.

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NOTE 2 For the purpose of this standard, the pollution degree is of the micro-environment.

The current is passed between each exposed conductive part and the terminal for the external protective conductor. Current in the neutral may be influenced where there are significant harmonics, unbalanced phase currents, or other conditions in the load that will necessitate a larger conductor.

British Standards

RevisionsInformation on standardsBritish Standards are updated by amendment or revision. Resistance to UV radiation applies for outdoor The degree of protection shall be at least 614439-1 XXB; — protection against the passage of solid foreign bodies.

For the purpose of evaluating clearances and creepage distances, the following four degrees of pollution in the micro-environment are established. To minimize danger when replacing fuse-links, interphase barriers shall be applied, unless the design and location of the fuses makes this unnecessary.

In such a case, the conductors of auxiliary circuits shall be arranged in such a manner 16439-1 a short-circuit is not to be expected see 8. The environments encompassed are residential, commercial and light-industrial locations, both indoor and outdoor.

With the forefinger wrapped in a dry piece of rough cloth, the sample is pressed with a force of 5 N. By using ribs of a minimum height of 2 mm the creepage distance may be reduced but, irrespective of the number of ribs, shall be not less than 0,8 of the value of Table 2 and not bd than the associated minimum clearance.

The method of verifying creepage distances by measurement is given in Annex F. A single-phase test supply shall be connected to the incoming terminal of one phase and to the terminal for the incoming protective conductor. Repetition of verifications in the product standards of switching devices or components incorporated in the ASSEMBLY, which have been selected in accordance with 8.

It is incorporated by Royal Charter.