IEC 60938-2 pdf free download
IEC 60938-2 pdf free download.Fixed inductors for electromagnetic interference suppression – Part 2: Sectional specification on power line chokes.
4.3 Information to be given in a detail specification
4.3.1 General
Detail specifications shall be derived from the relevant blank detail specification.
Detail specifications shall not specify requirements inferior to those of the generic or sectional specification. When more severe requirements are included, they shall be listed separately.
4.3.2 Outline drawing and dimensions
There shall be an illustration of the inductor as an aid to easy recognition and for comparison of the inductor with others. Dimensions and their associated tolerances, which affect interchangeability and mounting, shall be indicated upon the drawing. All dimensions shall be stated in millimetres.
The numerical values shall be given for the length of the body, the width and height of the body or for cylindrical types, the body diameter, and the length and diameter of the terminations. When necessary, for example when a number of items (inductance values/ voltage ranges) are covered by a detail specification, the dimensions and their associated tolerances shall be placed in a table below the drawing.
When the configuration is other than described above, the detail specification shall state such dimensional information to describe the inductor adequately. When the inductor is not designed for use on printed boards, this shall be clearly stated in the detail specification.
4.3.3 Mounting
The detail specification shall specify the method of mounting to be recommended for normal use and the method, which is mandatory for the application of the vibration and shock tests. The design of the inductor may be such that special mounting fixtures are required in its use. In this case, the detail specification shall describe the mounting fixtures and they shall be used in the application of the bump, shock and vibration tests. The specified heat sink shall be used in the application of the endurance test.
4.3.4 Ratings and characteristics
The ratings and characteristics shall be in accordance with the relevant clauses of this sectional specification. Additional characteristics may be listed, when they are considered necessary to specify adequately the inductor for design and application purposes.
4.4 Insulated inductors for power line applications
Insulated inductors may be built either with housing or with isolated wires where the isolation provides basic or reinforced insulation, e.g. TIW, FIW-wires, PVC-isolated wires, wires in insulation sleeves or the like. The isolated wires or the insulating materials used shall be in accordance with relevant IEC standards.
Fully insulated winding wires (FIW) shall comply by certificate with IEC 60851-5, IEC 60317-0-7 and IEC 60317-56. They may be applied maximum for insulation class F. FIW wires are chosen from Table F.1 to have a minimum dielectric test voltage to withstand the voltage test B or C with the test voltage defined in Table 1.
Insulation materials used between terminals and windings, for housing or potting, shall be certified to a minimum rating of V-2, VTM-2 or HF-2 according to IEC 60695-11-10, IEC 60695-11-20 (or UL 94) at the appropriate minimum thickness, which is determined by the smallest thickness of insulation in direct contact with a conductor.
4.5 Marking
Necessary marking according to the relevant specifications shall be prescribed in the detail specification. Deviations from these requirements shall be listed separately and the reason for it stated specifically in the detail specification.IEC 60938-2 pdf download.
