I am trying to reconcile PCB creepage distances between IPC2221 and UL840. In the past I have used the IPC2221 recommendations for PCB trace spacing, but have recently stumbled over UL840. To my surprise UL840 shows some ex tremely small clearance distances.
It looks like: UL840 Table 9.2 calls for 0.16mm for 100V IPC2221 Table 6.1 calls for 0.6mm for 100V
Does anyone know how to properly interpret UL840?
Thanks,
Ethan