UL Use Group C query

I was wondering if anyone in this group can help me with a problem I have.

It relates to the operating voltage that UL can allow in Use Group C (industrial) with a 5mm pitch terminal block.

Use Groups B and D are allowed 300V but C is only allowed 150V.

This means that for an industrial application using (European) mains voltage, terminals must be of 7.5mm pitch or greater.

Can anyone in Industry confirm this for me?