date BS EN is withdrawn and BS EN and BS EN In addition IEC and IEC have been amended, clarified and.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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BS EN 61439-1:2011
The clearances and creepage distances apply to phase to phase, phase to neutral, and except where a conductor is connected directly to earth, phase to earth and neutral to earth. Tables and gs in this Part 2 that are new are numbered starting with NOTE 2 The maximum load currents are used for the calculation instead of the rated currents of bd circuits and the rated diversity factor because these two rated values need more detailed consideration of different load conditions.
The power-frequency voltage shall be applied once, at full value, for a duration sufficient for the magnitude to be ascertained, but it shall not be less than 15 ms or greater than ms.
To shorten the test, if the devices allow it, the current may be increased during the gs part of the test, it being reduced to the specified test current afterwards.
Tests on individual devices to their respective product standards are not an alternative to the design verifications in this standard for the ASSEMBLY. The enclosure shall carry the symbol which shall be visible from the outside. We have lifting eyes held in a 2 614391 system, each b an eye is used it is returned to the lower rack, once all the eyes from the top rack are used the racks are swapped over — this ensures rotation of all the lifting eyes on an even basis during the year.
See Annex E for further details. Rated diversity factor can be stated: The following list, although not comprehensive, gives an indication of locations which are included: If these details are to be usedfor any other purpose than implementation then the prior written permissionof BSI must be obtained.
The value of the test voltage shall be that specified in 9. The mechanical operation of removable parts, including any insertion interlock, shall be verified by test according to Phase to neutral short-circuit connections shall be applied as specified in The minimum base of the rib is determined by mechanical requirements see Clause F.
The Amber document status indicator indicates that some caution is needed when using this document – it is either: The groups as defined by the original manufacturer shall be formed in a manner so that the highest possible temperature rise is obtained.
In the case of enclosures and conductors of aluminium or aluminium alloys, particular consideration shall be given to the danger of electrolytic corrosion. At higher currents additional eddy current losses may be significant which are not included in the values of the table.
The frequency, the level and the consequences of these sb are considered as part of the normal electromagnetic environment of low-voltage installations.
Because the actual local temperatures of the current-carrying parts cannot be calculated by these methods, some limits and safety margins are necessary and are included. The rated insulation voltage of a circuit shall be equal or higher than the values stated for U nand for U for the same circuit. RevisionsInformation on standardsBritish Standards are updated by amendment or revision. If it can 61439–1 mounted at different places the most unfavourable place shall be used. If an actuator is made of metal whether covered by insulating material or notit shall be provided with insulation rated for the maximum rated insulation voltage and the maximum impulse withstand voltage of all circuits in the ASSEMBLY.
With the forefinger wrapped in a dry piece of rough ba, the sample is pressed with a force of ej N. The test voltage shall then be applied once and, a for a time sufficiently long to enable the short-circuit protective device in the outgoing unit to operate to clear the fault and, in any case, for not less than 10 cycles test voltage durationor b in cases where the outgoing circuit does not include a SCPD, for a magnitude and duration as specified for the busbars by the original manufacturer.
BS EN – Low-voltage switchgear and controlgear assemblies. General rules
This list is not exhaustive; additional Parts may be developed as the need arises. When selecting current-limiting protective devices for built-in switching devices, account shall be taken of the maximum permissible values specified by the device manufacturer, having due regard to co-ordination see 9.
Tests – Test B: Type of protection against electric shock – Fault protection 8. It shall be connected to the main or the distribution busbar as in normal use. 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 less than the associated minimum clearance.
Representative samples of such parts shall be subjected to the following test: This schedule also facilitates the supply of information on basic conditions and additional user specifications to enable proper design, application and utilization of the ASSEMBLY.
This information shall form part of the test report. In order to consider the most onerous condition, the test shall be carried out at rated current and the test current shall pass through the full length of the distribution busbar. The test shall em carried out at rated current. NOTE Ability to withstand a particularly high test voltage is recognized as a means of ensuring the necessary degree of isolation.
Provides definitions and service conditions for assemblies with rated voltage not exceeding 1,V a. NOTE 2 Transients are disregarded. NOTE 4 The term “puncture” is used when a disruptive discharge occurs through a solid dielectric. However, ratings established for copper busbars shall not be used to establish ratings of aluminium busbars.
For these applications, it is recommended that creepage distances be selected using Annex L, Table L. Continuous conductivity occurs due to conductive dust, rain or other wet conditions. Also known as IEC An example of additional measures to be taken is the installation of an open-type ASSEMBLY without further provisions in a location where access is only permitted for authorized personnel.
A number of circuits may be heavily loaded while others are lightly 611439-1 or switched off.
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
Tests – Test Ka: The method of verifying creepage distances by measurement is given in Annex F. To avoid the large number of tests that may be necessary this clause describes a verification method where only one 16439-1 is made with simultaneous load on all circuits.
At the same time, the operation of the mechanical interlocks associated with these movements shall be checked. The connecting means to ensure the continuity of the conductive parts with external protective conductors 61439- have no other function. Where the enclosure is subjected to the test it shall be mounted as for normal use according to the original manufacturer’s instructions.