FACTORY
FACILITY WORK
 
ELECTRICAL LOW VOLTS
 ELECTRICAL HIGH VOLTS
 COMMUNICATION SYSTEM WORK
 AIR CONDITIONING
 COMPRESSED AIR PIPING
 DUCT & EXHAUST
 
FACTORY
DECORATION WORK
INELECTRICAL POWER SYSTEMS LOW VOLTAGE MOST COMMONLY REFERS TO THE MAINS VOLTAGES AS USED BY DOMESTIC AND LIGHT INDUSTRIAL AND COMMERCIAL CONSUMERS.  ELECTRICAL LOW VOLTS
IN ELECTRICAL POWER TRANSMISSION ENGINEERING HIGH VOLTAGE IS USUALLY CONSIDERED ANY VOLTAGE OVER APPROXIMATEIL 35,000 VOLTS.  ELECTRICAL HIGH VOLTS
MEANS OF SENDING OR RECEIVING INFORMATION, SUCH AS TELEPHONE LINES OR COMPUTERS.  COMMUNICATION SYSTEM WORK
A SYSTEM FOR CONTROLLING THE HUMIDITY, VENTILATION, AND TEMPERATURE IN A BUILDING OR VEHICAL, TYPICALLY TO MAINTAIN A COOL ATMOSPHERE IN WARM CONDITIONS.  AIR CONDITIONING
A COMPRESSED AIR SYSTEM TRANSFERS POWER IN THE FORM OF AIR PRESSURE.  COMPRESSED AIR PIPING
DUCTS ARE CONDUITS OR PASSAGES USED IN HEATING, VENTILATION, AND AIR CONDITIONING (HVAC) TO DELIVER AND REMOVE AIR.  DUCT & EXHAUST