Dry-type transformers avoid liquid dielectrics, reducing fire and environmental risk indoors. They are preferred in buildings, tunnels, offshore modules, and industrial spaces where spill containment, ventilation for oil-filled units, or fire barriers would be problematic. Resin or cast-coil insulation tolerates moisture and contamination better in some environments. They also reduce maintenance related to oil sampling and leaks, making them attractive for commercial and institutional facilities.