Machine Room Electrical Distribution, Cable Selection, Earthing & Lightning Protection
Refrigeration machine room power load includes compressor, condenser fan, pump, control cabinet, defrost heater, lighting and alarm. Cable selection: consider starting current of compressor, low temperature resistance, oil resistance, flame retardant grade. Compressor power cable separate from sensor signal cable; separate trunking to avoid electromagnetic interference to PT100/NTC signal. Earthing system: all metal equipment, pipe bracket, control cabinet connect to equipotential earthing bar, anti-static and electric leakage. Three phase power balance monitoring; long-term unbalance will increase motor heating and shorten compressor service life. Xiteliduo export machine room electrical scheme complies with IEC standard, optional local certification such as UL. Lightning protection: outdoor condenser and rack metal frame connect to lightning protection system for thunderstorm area. Emergency power supply (UPS): for controller, alarm, gas detector; avoid losing monitoring and alarm during mains failure. Defrost heater is large resistive load; separate circuit and contactor, overcurrent protection matched for heater. Refrigeration maintenance & repair company measures earthing resistance and three-phase current balance periodically.
FAQ
- Why separate power cable and sensor signal cable? Prevent EMI interference to temperature and pressure signal.
- What should all metal equipment connect to? Equipotential earthing bar.
- What power issue accelerates compressor motor aging? Three-phase current unbalance.
- What standard for export electrical design? IEC standard.
- What does UPS supply power for? Controller, alarm and gas detector.
- What load is defrost heater? Large resistive load.
- What connects to lightning protection system? Outdoor condenser and metal rack frame.
- What cable performance matters near compressor? Oil resistance and flame retardant.
