For Information Technology (IT) equipment, Including
Electrical Business equipment application
EN 60950, UL 60950,
CSA C22.2
ˇDMinimum creepage distance
Material
group I 600 ˇŘ CTI
Material group II 400 ˇŘ CTI ˇŘ
600
Material group IIIa 175 ˇŘ CTI
ˇŘ 400
Material group IIIb 100 ˇŘ CTI
ˇŘ 175
Distance through insulation : Not required for working less than 50V
0.4mm minimum for working voltage exceed 50V at supplementary insulation or reinforced insulation without mechanical stress.
Standards 2
ˇDUse in electrical equipment applications : UL 746C
ˇDMechanical / electrical property consideration: Hot Wire Ignition High Amperage Arc Ignition UL94V- Flammability Classification Comparative Tracking Index
Standards 3
Others
a. Dielectric breakdown strength : 5,000 Vrms minimum. Higher voltage might be required for various products.
b. Volume resistivity : 50 * 106 ohm/cm minimum. Higher values might be required in various end products.
c. Moisture resistance : 2% change maximum in dimension measured before and after 24 hours in water at 230C. This requirement is only for out door equipment application.
d. CTI : 100V minimum for indoor equipments in a relative clean environment. 175V minimum for most outdoor and indoor equipments that may be to derate taminated environment.
Standards 4
In different applications, UL746 required performance level as bellowed.
