EMI Spacing

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 Question by Steve Broughton posted 03 Jan 2001
 EMI Spacing
I have been told that all of my termination (rack, patch panels and hubs) equipment will be in a room that has an electrical transformer hanging from the ceiling on the opposite side of the room approximately 8' from the top of my rack.

What is your recomendation for spacing?
 Answer by Dmitri Abaimov posted 05 Jan 2001
Dear Steve,

There are separation rules described in EIA/TIA-569 standard. They don't
refer transformer itself as a greatest potential source of troubles but rather power
lines that feed the transformer. It is not quite clear but anyway, the biggest separation distance, described there is ~2 feet for 5kVa 480V power lines. That's why it's pretty
safe to set you termination equipment is about 8 feet apart from the transformer.
These separation issues are described in our guide:
Guide to Separation of Network Cabling from EMI sources. You can take a
look at it on our e-books page here:


Good luck with your installation!
Dmitri Abaimov, RCDD

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