Calculation of the temperature rises in compliance with the Std. IEC 60890

Calculation of the powers generated by the different components and dissipated inside the assembly   The calculation of the power losses reported in the configurations shown is carried out by taking into account the effective powers dissipated by the different components....

Open-type and enclosed assemblies

According to the constructional typology the Standard IEC 61439-1 distinguishes between open-type and enclosed assemblies.   - Enclosed assembly   An assembly is enclosed when there are protected panels on all its sides so as to provide a degree of protection against direct contact not lower than IPXXB (see Chapter 4). Assemblies intended to be installed...

Rated electrical characteristics of an assembly

Rated voltage (Un) Highest nominal value of the a.c. (r.m.s) or d.c. voltage, declared by the assembly manufacturer, to which the main circuit(s) of the assembly is (are) designed to be connected. In three-phase circuits, it is the voltage between phases. Rated operational...

Design verification of the new standard IEC 61439

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IEC standards

IEC 60038 Standard voltages IEC 60076-2 Power transformers - Temperature rise IEC 60076-3 Power transformers - Insulation levels, dielectric tests and external clearances in air IEC 60076-5 Power transformers - Ability to withstand short-circuit IEC 60076-10 Power transformers - Determination of sound levels IEC 60146 Semiconductor convertors - General requirements and line...

Explosion Proof Lighting & Power Distribution Panel Board Series

DOWNLOAD : http://www.akronelectric.com/pdf_files/Explosion-Proof%20Panel%20Boards.pdf ...

Panelboards P1 thru P5 (Selection & application guide)

DOWNLOAD :   http://www.scottelectricusa.com/apparatus/panelboards.pdf ...

Clearances & Creepage distances for LV panel boards

Clearances distances Shortest distance in the air between two live conductors or between live Conductors and exposed conductive parts. 14 mm for 12 kV impulse voltage 8 mm for 8 kV impulse voltage 5.5 mm for 6 kV impulse voltage The IEC 60439-1 and IEC 61439-2 standards stipulate the minimum clearances Required to withstand impulse voltage up to 2000 m above sea...

MILLIVOLT DROP TEST

The millivolt drop test is generally associated with testing for weld quality on the armature. It is the best test for verifying armature weld quality. The millivolt drop test is the ultimate electrical test for detecting bad welds. Unfortunately, it is difficult to make on armatures with large diameter wire and nearly impossible to make on armatures with small wires....

The new IEC 61439 standard

The new IEC 61439 standard applies to enclosures for which the rated voltage is under 1000 V AC (at frequencies not exceeding 1000 Hz) or 1500 V DC. The standard defines the design verified ASSEMBLIES and eliminates completely the categories TTA and PTTA. In order to conform to the standard, type tests have been replaced by a design verification which can be carried ...

IEC 60529 First Characteristic Numeral Degrees of Protection - Water

INDOOR   IP X1 Vertical Falling Drops           10 Min. Drip Test                              Limited Water Inside; Not on Live Parts   IP X2 15° Vertical Falling Drops   ...

IEC 60529 First Characteristic Numeral Degrees of Protection - Solids

>> IEC 60529 First Characteristic Numeral Degrees of Protection – Solids   Protection Test Method Pass Criteria   INDOOR   IP 1X Incidental Contact & Solid Objects Ø 50 mm – Probe No Penetration IP 2X Incidental Contact & Solid Objects Ø 12.5 mm – Probe No Penetration IP 3X Incidental Contact & Solid Objects Ø 2.5 mm – Probe No Penetration...