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This article is from the Data Communications Cabling FAQ, by Peter Macaulay pmac@fox.nstn.ca with numerous contributions by others.

18.0 How Far Away Should Cable be Installed from an EMI Source (Data Communications Cabling)

Northern Telecom IBDN User Manual contains an Appendix D titled
"UTP Separation Guidelines From EMI Sources". The values are the
same as the cabling pathways standard, EIA-569, table 4.8-5.

      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.
      (12.7 cm)  (30.5 cm)  (61 cm)
     Unshielded power lines or
     electrical equipment in proximity
     to grounded metal conduit pathway    2.5 in.     6 in.     12 in.
      (6.4 cm)  (15.2 cm)   (30.5 cm)
     Power lines enclosed in a grounded
     metal conduit (or equivalent
     shielding) in proximity
     to grounded metal conduit pathway      -         6 in.     12 in.
         -      (15.2 cm)   (30.5 cm)
  
     Transformers & electric motors       <------- 40-in (1.02 m) ----->
  
     Fluorescent lighting                 <------- 12-in (30.5 cm) ---->

Source: Integrated Building Distribution Network (IBDN) User Manual
- Northern Telecom, doc # IBDN-UM-9105, 1991.

The EIA/TIA working group revising the EIA-569 standard is using the
results of field and lab tests to update the recommendations. The
target date for completion is Dec 1995.

 

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• prev: 17.0 Typical Wiring Layout (Data Communications Cabling)
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• next: 19.0 What is the Minimum Bending Radius for a Cable? (Data Communications Cabling)

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