1. Front compartment will be dust and vermin proof, provided with suitable gaskets and will be housed with Power Contactors and other switchgear.
2. Back compartment will be well ventilated, forced cooled type, and will be housed with resistance banks. The resistance will be stainless steel coil type with high thermal capacity and will be designed for temperature rise 350°C. The resistance coils will be mounted on angle iron structure with proper support to absorb the vibration and stresses that occur during transit/fault. The load switching contactors panel and Resistance box are mounted in the same unit with partition in between. Connection between the resistance box and contactors are done by solid copper jumpers through polypropylene sheets. Adequate number of cooling fans provided to take away the heat generated during regulation.