Engineering · 6 min read

Transformer rooms and electromagnetic fields

Integrating a transformer room into an occupied building is routine — and routinely underestimated during design.

The field footprint

A typical 1 MVA distribution transformer with its LV connections produces fields exceeding 1 µT up to several metres away, particularly above and below the room where structural slabs offer little attenuation.

Design levers

Position the room under non-sensitive uses, keep LV runs short and tight, orient the distribution board away from occupied rooms and reserve space for a future shield during civil design.

Verification

A commissioning measurement under representative load closes the loop and provides the documentation authorities and building owners expect.

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