Unshielded data cables should not be installed near sources of
electromagnetism. There is a standard that specifies these distances for
structured data cabling systems. EIA/TIA-569, the cabling pathways
standard, specifies the following Minimum Separation Distance from Power
Source at 480V or less:

Condition < 2kVA 2-5kVA < 5kVA
Unshielded power lines or electrical equipment in proximity to open
or non-metal pathways
5 in. 12 in. 24 in.
Unshielded power lines or electrical equipment in proximity to
grounded metal conduit pathway
2.5 in. 6 in. 12 in.
Power lines enclosed in a grounded metal conduit ( or equivalent
shielding (in proximity to grounded metal conduit pathway).
6 in. 12 in.
Transformers and Electric Motors 40 in. 40 in. 40 in.
Fluorescent lighting 12 in. 12 in. 12 in.
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