Generally, it's recommended that data cabling is designed and implemented in accordance with the recommendations of:
Both these series of standards are referenced from BS7671 along with BS EN50310 (for earthing provisions).
Specifications may also be generated in line with EIA/EIA 942.
In addition to ensuring segregation from mains cabling (and separation under the conditions specified in EN50174-series), as mbirdi points out, EN50174-series also discusses recommended distances of IT cabling from certain kinds of lighting and other plant/appliances, although if it's in earthed metallic containment, then the risk of EMC problems is reduced.
EUR ING Graham Kenyon CEng MIET TechIOSH
Principal and Proprietor,
G Kenyon Technology