Which of the following is an effect of small carbon particles inside the refrigeration system?

• A. Grounding hermetic compressor terminals
• B. Restricting metering devices
• C. Increased refrigerant charge
• D. No effect

Answer: (A)

Small carbon particles act as conductive contaminants in a refrigeration system. If these particles lodge on or bridge electrical paths to the compressor housing or windings, they can create a conductive path to ground. In a hermetic compressor, this can cause a ground fault, with current leaking to the housing and earth, potentially tripping protective devices and damaging insulation. That’s why grounding of the compressor terminals is the effect described. The other possibilities don’t fit the electrical fault produced by carbon contamination—they don’t reflect an actual grounding issue, and there’s no increase in refrigerant charge due to these particles.