The database is arranged as a hierarchy. For example, the value of a Level-3 equipment category is equal to the sum of its Level-4 subcategories.  A category's level can be determined by the number of non-zero digits.  For example CONTROLS (561000) is a Level-3 category.

5-6-0-0-0-0 INDUSTRIAL                                        

5-6-1-0-0-0 CONTROLS                                         

5-6-1-1-0-0 INDUSTRIAL CONTROLS                       

5-6-1-1-1-0 MOTOR CONTROL/ACCESS                   

5-6-1-1-2-0 GP INDUSTRIAL CONTROLS                   

5-6-1-1-3-0 SPECIFIC PURPOSE                                 

5-6-1-2-0-0 PROCESS CONTROLS                           

5-6-1-2-1-0 SENSORS/INSTRUM/TRANSMITTER         

5-6-1-2-1-1 TEMP INSTRUMENTS/SENSORS              

5-6-1-2-1-2 HUMIDITY/PRESS/FLOW LEVEL             

5-6-1-2-1-3 ELECTROMAGNETIC/OTHER                 

5-6-1-2-1-4 CONTINUOUS PROCESS INSTRUMENTS          

5-6-1-2-2-0 ON-STREAM ANALYZERS                      

5-6-1-2-3-0 MULTI-FUNCTION PROCESS CPU                      

5-6-1-2-4-0 DISPLAY/CONTROL RECEIVERS

5-6-1-2-5-0 OTHER PROCESS CONTROL

5-6-1-2-7-0 NEW CATEGORY SYSTEM FOR PROCESS CONTROL

                    CONTROLLERS

                    OTHER UNIFIED ELECTRIC SYSTEM

                    AUXILIARY STATION & ANALOG DEVICE

                    ELECTRONIC SYSTEM - NON UNIFIED

                    INDUSTRIAL MULTIFUNCTION COMPUTER

                    PNEUMATIC SYSTEMS & ANNUNCIATORS

                    OTHER INDUSTRIAL INSTRUMENTS

                    CONTINUOUS PROCESS INSTRUMENTS

                    OTHER PROCESS VARIABLE INSTRUMENTS

                    PARTS FOR PROCESS CONTROL

                    TEMPERATURE MEASUREMENT - ELEC.

                    OTHER TEMPERATURE MEASUREMENT 

                    THERMOCOUPLES

                    OTHER SENSORS

                    PRESSURE & DRAFT INSTRUMENTS

                    FLOW & LIQUID LEVEL MEASUREMENTS

                    HUMIDITY INSTRUMENTS

5-6-1-3-0-0 NUCLEAR DETECTION & MONITOR              

5-6-1-3-1-0 MONITORING INSTRUMENTS        

5-6-1-3-2-0 RADIATION DETECTION                  

5-6-1-9-0-0 OTHER CONTROLS                              

5-6-1-9-1-0 VEHICLE, PEDESTRIAN & RR SIGNAL & CONTROL                     

5-6-1-9-8-0 BOARD ASSEMBLY FOR INDUS CONTROLS      

5-6-2-0-0-0 PRODUCTION EQUIPMENT                    

5-6-2-1-0-0 WELDING APPARATUS                          

5-6-2-1-1-1 ARC WELDING MACHINES

5-6-2-1-2-0 RESISTIVE WELDERS

5-6-2-1-9-0 OTHER WELDING APPARATUS

5-6-2-2-0-0 INDUSTRIAL LASERS

5-6-2-2-1-0 LASER EQUIPMENT

5-6-2-2-2-0 LASER RANGING INSTRUMENTS

5-6-2-2-9-0 OTHER LASERS/COMPONENTS

5-6-2-3-0-0 ROBOTS

5-6-2-4-0-0 HIGH FREQUENCY INDUCTION

5-6-2-5-0-0 SEMICONDUCTOR MANUFACTURING

5-6-2-6-0-0 PWB MANUFACTURING

5-6-3-0-0-0 PRODUCTION SUPPORT/SERVICE

5-6-3-1-0-0 INSPECTION TEST

5-6-3-1-1-0 PHYSICAL PROPERTIES

5-6-3-1-2-0 KINEMATIC PROPERTIES

5-6-3-1-9-0 OTHER INSPECTION/TEST (OPTICAL)

5-6-3-2-0-0 INDUSTRIAL POWER SUPPLY

5-6-3-3-0-0 DATA ACQUISITION FOR DISCRETE PROCESSES

5-6-3-8-0-0 ULTRASONIC EQUIPMENT

5-6-4-0-0-0 ENVIRONMENTAL SYSTEMS

5-6-4-1-0-0 AUTOMATIC MONITORING

5-6-4-1-1-0 SENSORS & CONTROLLERS - LIGHTING

5-6-4-1-2-0 ENERGY CONTROL SYSTEMS

5-6-4-2-0-0 POLLUTION MONITORING

5-6-4-3-0-0 NON-RESIDENTIAL SAFETY SYSTEMS

5-6-4-3-1-0 FIRE DETECTION & ALARM

5-6-4-3-2-0 INTRUSION DETECTION & ALARM

5-6-4-3-9-0 OTHER ALARM

5-6-4-4-0-0 UTILITY/INDUS/METER COUNTER

5-6-4-4-3-0 ELECTRICITY

5-6-4-4-9-0 OTHER METER/COUNTER

5-6-5-0-0-0 CONTROLS FOR APPLIANCES

5-6-8-0-0-0 OTHER INDUSTRIAL ELECTRONICS

5-6-8-1-0-0 SEISMIC & GEOLOGICAL

5-6-8-2-0-0 COUNTING DEVICES

5-6-8-3-0-0 GENERAL INSTRUMENTS

5-6-8-4-0-0 MESSAGE SIGNS

5-6-9-0-0-0 ALL OTHER NEC

5-6-9-1-0-0 SWITCHGEAR EXCEPT DUCTS

5-6-9-2-0-0 INDUSTRIAL CONTROL RELAYS

5-6-9-3-0-0 POWER CIRCUIT BREAKERS

5-6-9-4-0-0 LOW VOLTAGE PANELS

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