Risers are the usual culprit
Vertical busbar risers carrying thousands of amperes pass close to occupied floors and are rarely considered during architectural planning.
Shield without choking ventilation
Enclosures must allow convective cooling and maintenance access. Ventilated seam geometries designed by simulation keep attenuation while preserving airflow.
Boundary obligations
Where a facility adjoins housing or offices, compliance is judged at the neighbour, not inside the plant. Early simulation prevents late and expensive surprises.