Amund,
The answer to your question is somewhat tricky since you mention the product (radio/tele cabinet) and reference EN60950.
The standard for audio/video equipment is IEC60065/EN60065. In a nutshell, this standard does not specify openings, but as long as the test probes cannot contact hazardous live parts you should be OK. As an example para 9.1.3 states that a test pin 4mm x 100mm shall not contact hazardous parts when suspended freely from one end as it is inserted into the openings.
EN60950 (information technology equipment) states these requirements in para 4.3.14, 4.3.15, and 4.3.16. The general rule is 5mm max. or 1mm in width regardless of length. It is possible to have openings in excess of these limits if you use the 5 degree rule as stated in 4.3.16 only for side openings.
As for IP requirements, EN60950 states them in para 1.1.2, and in Annex T, IEC60065/EN60065 states them in Annex A.
The paragraphs for EN60950 may be slightly different than stated above since I happen to have an older version of the standard in front of me.
Depending on the type of equipment you have either or both of the standards can apply. Refer to the scope of each standard for assistance.
Regards,
Ed
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