Remarkable difference between 29.9 kHz and 30.1 kHz!
On 2023-07-25 23:39, Ryan Jazz wrote:
Dear Members,
Hope you can help me understand the requirement for the clearance
needed between the bottom PCB of power supply to metal chassis.
Looking up UL 62368-1 Third Edition, and using the ‘Voltage up to an
including peak’ of _2000 V_ for overvoltage category II Table 10 for
_<30 kHz_.
I see the clearance is 1,27 mm.
Going over to Table 11 _>30_ kHz this clearance value jumps to 13,2 mm.
Am I doing this correctly? Or should I be using the ‘working voltage’
of the power supply, Primary to Earthed Dead Metal 392 Vpk, Primary to
Secondary 520 Vpk.
100-240 Vac, 100 W, _90 kHz_ switching frequency, AC power supply with
a 2x3 inch footprint.
End product is, overvoltage category II, pollution degree 2, material
group III.
Indoor audio music processor, Class 1.
All guidance would be appreciated.
If this 13,2 mm value is indeed correct, I may need to use an
insulator under the power supply.
Any recommendations for a UL rated insulator type?
Thank you,
Ryan Jazz
Ryan Jayasinghe
Regulatory Compliance Engineer
[email protected]
"After silence, that which best expresses the inexpressible, is music"
- Aldous Huxley
LINE6
26580 Agoura Road
Calabasas CA 91302
818.575.3711
line6.com
ampeg.com
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