9. Electromagnetic Interference

Voice and data telecommunications cabling should not be run adjacent and parallel to power cabling-even along short distances-unless one or both cable types are shielded and grounded. For low-voltage communication cables, a minimum 5-inch distance is required from any fluorescent lighting fixture or power line over 2 kVA and up to 24 inches from any power line over 5 kVA*. In general, telecommuni-cations cabling is routed separately, or several feet away from power cabling. Similarly, telecommunications cabling is routed away from large motors, generators, induction heaters, arc welders, x-ray equipment, and radio frequency, microwave or radar sources.

*Note: Distance recommendations from (1990) TIA/EIA-569 are reproduced here by popular request. For current recommendations, refer to NEC/NFPA 70, Article 800-52.