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Tajudeen Oladele wrote:
I have been asked to explain how to measure the Creepage between two traces and the correct interpretation of UL creepage requirements (Table 2L) for secondary circuits. I will appreciate your well respected explanation on how to measure the creepage distance between two circuits, my interpretation according to UL60950 figure 2F is: (1) Earthed Hazardous Voltage to Ground (Basic insulation). (2) Earthed Hazarous Voltage to TNVs (Reinforced for TNV1, TNV2 or TNV3). (2) TNV2 to earthed SELV (basic insulation) (3) TNV3 to earthed SELV or logic Ground (basic insulation). Assumptions - Each pair of traces are located in the inner layer of a PCB. - 10 layers board powered from dc source - Working Voltages: Up to 100Vdc 90Vrms ringing voltage. - PCB material group IIIa or IIIb. - Pollution Degree 2 Regards Tajudeen Oladele Alcatel, Petaluma 707-792-7145Title: Measurement of creepage on inner and outer layers of Printed Cinrcuit board.
Tajudeen Oladele wrote:
I have been asked to explain how to measure the Creepage between two
traces and the correct interpretation of UL creepage requirements (Table
2L) for secondary circuits.
I will appreciate your well respected explanation on how to measure the
creepage distance between two circuits, my interpretation according to
UL60950 figure 2F is:
(1) Earthed Hazardous Voltage to Ground (Basic insulation).
(2) Earthed Hazarous Voltage to TNVs (Reinforced for TNV1, TNV2 or
TNV3).
(2) TNV2 to earthed SELV (basic insulation)
(3) TNV3 to earthed SELV or logic Ground (basic insulation).
Assumptions
- Each pair of traces are located in the inner layer of a PCB.
- 10 layers board powered from dc source
- Working Voltages: Up to 100Vdc 90Vrms ringing voltage.
- PCB material group IIIa or IIIb.
- Pollution Degree 2
Regards
Tajudeen Oladele
Alcatel, Petaluma
707-792-7145
<<attachment: Tajudeen.Oladele.vcf>>
