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ITFrequently Asked Questions · UPS
What distance should be kept between a UPS and data processing systems?
Because the input/output cables cause electromagnetic interference, we recommend keeping some distance between the UPS and sensitive devices (e.g., medical equipment) to avoid interference.
Every UPS creates electromagnetic fields, mainly from the transformer, the power electronics and the cables carrying high currents. The units comply with electromagnetic compatibility standards, so ordinary office equipment such as computers and monitors is not affected. Distance becomes important when very sensitive devices are nearby: medical equipment, laboratory measuring instruments, audio equipment or systems that process weak signals.
There is no single distance that applies everywhere. The recommendations of the sensitive device's manufacturer and the UPS manual take priority. In general, the higher the UPS power, the more space is needed.
Practical measures that help:
- Do not place the UPS on top of or directly next to the sensitive device.
- Route power cables separately from data and signal cables and, where they must cross, cross them at right angles.
- Make sure of proper earthing, common to all the equipment.
A common mistake is putting a large UPS on the same shelf as measuring instruments and then blaming the instrument for anomalies caused by the interference.