The insulation type needed and conditions of use are described in IEC 60950
table 2G, probably basic (exceptions in 2.3.2)
For clearances, unless you know the voltages to be otherwise (e.g. proprietary
circuits), TNV2 (add in your SELV voltages) has a voltage up to 200Vp to earth
(M.3.1.2) and a transient rating of 800 V (2.10.3.3 note) so use table 2K (2H if
floating SELV), the row for 210 Vp and the column for nominal <150 V.
For creepages, unless you know the voltages to be otherwise (e.g. proprietary
circuits), TNV2 (add in your SELV voltages) has a working voltage up to 120 Vdc
(2.10.4) so use table 2L, the row for 125 V.
If you plan to sell in Europe, throw all that out because you need to use the
values for supplementary insulation for mains voltages due to Norway and Sweden
(6.1.2.1 notes)
Bob
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