PCB terminals and connectors
To protect persons or system from the effects of electrical operating voltages, especially in the case of malfunction of equipment, sufficient measurement of the clearance and creepage distance is required.
For safety reasons and for every certification (IEC, UL, CSA) it is essential that certain clearance and creepage distances are maintained. In the following you find further explanations and information on determining clearance and creepage distances.
Determination in accordance with IEC:
(1) Identification of the overvoltage category
(2) Definition of the pollution severity
(3) Determination of the rated surge voltage according to the following table
(4) Determination of the minimum creepage distance according to the following table
(3) Determination of the rated surge voltage dependent on the mains according to the following table
(4) Determination of the minimum creepage distance dependent on the pollution severity according to the following table
Creep- and clearance distances
The rated impulse voltage, critical for the dimensioning of the clearance distance, results from the overvoltage category and the conductor – earth voltage derived from the nominal mains voltage (taking all mains types into consideration).
The minimum clearance distance (up to installation heights of 2000 m above sea level) is determined from the rated surge voltage and the pollution severity.
A detailed overview of the calculation of the clearance and creepage distance is available: Calculation of the clearance and creepage distance in accordance with VDE / IEC and UL
Norms und standards – IEC, UL/CSA, VDE, EN
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