Hi all,

        I am in need of some information regarding the general standard on
handtools and clearing distances. A gentleman at TUV informed that primary
and secondary ciruits, in this case separated by a transformer, need at
least 8mm clearance between components. In other words, components in the
secondary side must be 8mm away from anything on the primary side. I've
never heard of this. Can anyone shed some light on this?

        Second, I was told the distance between traces must be 150V per mm.
For 230V, this is over 2mm. It does say this can be reduced if the tool
complies with clause 18. I take that to mean if it passes the short-circuit
test, the spacing is ok. In any case, I thought the traces could be
considerably closer than this. I am used to the table given in IPC-2221,
where the minimum spacing (external conductor w/ conformal coating) is given
as 0.8mm. I know IPC isn't an international standard, but it can't be that
much different for 60645, can it?

        Is 60745 even the correct standard to apply to a circuit board, or
should a different one be used for the circuit board? Any pointers on where
to go to educate myself on this matter would be greatly appreciated?

-Phil Eisermann

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