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Need to clarify what problems may arise from servers in the server room when a transformer station is at a distance of 10 meters. thanks.

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Generally none. 10m is plenty of space. But do you know the voltages and power involved in the transformers? Is the station indoors or out? Is there a firewall (brick, concrete) between? Are transformers oil or air cooled? This questions is probably more appropriate in the EE section. – Skaperen Nov 30 '12 at 7:11

I've done it...

No noticeable impact on my servers. I've had indoor transformer units nearby, as well as external. The worst was actually having a 480V transformer in my server room, two meters from the server rack. The worst issues there were heat and the inconvenient access for electrical repair/service.

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I agree. Oil-cooled transformers are usually shielded anyway by the oil-tank itself, which is nearly always metal. Air-cooled by necessity has openings, but the fields rarely extend more than 1 to 2 meters outside the device. The very big ones (like 150 KV transformers in use by the power company) have a safety-zone around them (arcing-risc) that is usually bigger than the EM fields. – Tonny Dec 1 '12 at 22:39

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