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