Table 8.51 — ECs in the SUPPORT_STRUCTURE group
EC labels
AERATION_STRUCTURE
AERIAL_CABLE
AERIAL_CABLE_PYLON
AERIAL_CABLE_SET
AERIAL_SUPPORT_MAST
AMUSEMENT_PARK_ATTRACTION
ASTRONOMICAL_STATION
BLAST_FURNACE
BREAKWATER
BRIDGE
BRIDGE_PIER
BRIDGE_SPAN
BRIDGE_SUPERSTRUCTURE
BRIDGE_TOWER
CADASTRAL_CONSTRUCTION
CALVARY_CROSS
CHAIN
COMMUNICATION_TOWER
CRIB
ELECTRICAL_SIGNAL_LINE_PYLON
ELECTRIFIED_RAILWAY_PYLON
EMBANKMENT
EXTERIOR_WALL
FOUNTAIN
FURNACE
GANTRY
LIGHT_SUPPORT_STRUCTURE
LOAD_CABLE
MAST
NON_COMMUNICATION_TOWER
POLE
POWER_TRANSMISSION_LINE_PYLON
PYLON
RUINS
STORAGE_BUNKER
STORAGE_PIT
STORAGE_STRUCTURE
STRUCTURAL_PILE
STRUCTURE
STRUCTURE_ENTRANCE
STRUCTURE_ENTRANCE_AND_OR_EXIT
STRUCTURE_EXIT
STRUCTURE_EXTERIOR
STRUCTURE_PERIMETER
SUPERSTRUCTURE
TOWER
VIADUCT
WALL
WALL_LOOPHOLE
http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_IEC_18025_Ed1.html