ECs in the SUPPORT_STRUCTURE group

ECC_AERATION_STRUCTURE	ECC_AERIAL_CABLE	ECC_AERIAL_CABLE_PYLON	ECC_AERIAL_CABLE_SET
ECC_AERIAL_SUPPORT_MAST	ECC_AMUSEMENT_PARK_ATTRACTION	ECC_ASTRONOMICAL_STATION	ECC_BLAST_FURNACE
ECC_BREAKWATER	ECC_BRIDGE	ECC_BRIDGE_PIER	ECC_BRIDGE_SPAN
ECC_BRIDGE_SUPERSTRUCTURE	ECC_BRIDGE_TOWER	ECC_CADASTRAL_CONSTRUCTION	ECC_CALVARY_CROSS
ECC_CHAIN	ECC_COMMUNICATION_TOWER	ECC_CRIB	ECC_ELECTRICAL_SIGNAL_LINE_PYLON
ECC_ELECTRIFIED_RAILWAY_PYLON	ECC_EMBANKMENT	ECC_EXTERIOR_WALL	ECC_FOUNTAIN
ECC_FURNACE	ECC_GANTRY	ECC_LIGHT_SUPPORT_STRUCTURE	ECC_LOAD_CABLE
ECC_MAST	ECC_NON_COMMUNICATION_TOWER	ECC_POLE	ECC_POWER_TRANSMISSION_LINE_PYLON
ECC_PYLON	ECC_RUINS	ECC_STORAGE_BUNKER	ECC_STORAGE_PIT
ECC_STORAGE_STRUCTURE	ECC_STRUCTURAL_PILE	ECC_STRUCTURE	ECC_STRUCTURE_ENTRANCE
ECC_STRUCTURE_ENTRANCE_AND_OR_EXIT	ECC_STRUCTURE_EXIT	ECC_STRUCTURE_EXTERIOR	ECC_STRUCTURE_PERIMETER
ECC_SUPERSTRUCTURE	ECC_TOWER	ECC_VIADUCT	ECC_WALL
ECC_WALL_LOOPHOLE