>> This is a non-mains application. Regulatory clearances do not 
>> apply.

> Is this really true? At least functional insulation should apply...
> If you go for protection class II, then double insulation or 
> reinforced
> insulation will be necessary.

The system as a whole needs to be and is insulated. The high voktage 
is generated and utilised entirely within the equipment. It's an 
electromechanical & electrronic load control system in exercise 
equipment.

>> - 150 VDC between TO220 0.1" pitch pads
>
> 0.1" = 2.54mm, should be okay.

Note that that's 0.1" pitch - the pads reduce that markedly. This sort 
of voltage is routinely handled by TO220 parts. As voltages get up 
people have been known to "stagger" the leads to achieve greater PCB 
spacings. Then the package pin to pin spacings become the limiting 
distance. This is usually only a problem where there is contamination.


        Russell


-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist