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If the PCB is sealed with solid sealant, how to determine the creepage distance and clearance?

functional insulation as well as other insulation exists on circuit boards. Typically, the surface environment of a circuit board is determined to be either Pollution degree 3 or pollution degree 2.If the circuit board is mounted in an electrical box and sealed with a solid sealant, the sealing will look as follows: What should be…

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A question about functional insulation requirements at the ends of a current fuse

The following circuit diagram The current fuse in position F1 is usually connected in series with the line.The photos of the real thing are shown in the following two pictures, the left one is not labeled, the right one shows the location of the current fuse and some other basic information. In the diagram above,…

Tabelle 17 und Tabelle 18 von IEC 60335-1

Es gibt einen Hinweis in Tabelle 17 und Tabelle 18 wie folgt: „Für Arbeitsspannungen und GT; 10 V und ≤ 630 V können die Werte der Kriechstrecken durch Interpolation ermittelt werden, wenn die Spannung nicht in der Tabelle angegeben ist.“ Wenn die Betriebsspannung nicht dem in der Tabelle aufgeführten Wert entspricht, müssen wir normalerweise berechnen,…