Electrical Safety in Ammonia Refrigeration Systems

There is little guidance in ammonia refrigeration codes and standards to address the installation and maintenance of electrical components. The most applicable code requirement in IIAR Standard 2 states that “Electrical equipment and wiring shall be installed in accordance with the electrical code.” (§14.3.5 )

The requirements in the electrical codes (National Electrical Code or California Electrical Code) may appear daunting if you are not an electrician by trade. Here is a summary of select electrical requirements that could be inspected by a refrigeration system operator: 

• Ensure electrical equipment is protected from dripping condensation that develops on ammonia valve groups/piping. (2022 CEC §110.11)
• Ensure electrical equipment is installed in a “neat and workmanlike manner”. (2022 CEC §110.12)
• Ensure electrical equipment/wiring is not damaged or contaminated by foreign materials like paint, plaster, cleaners, abrasives, or corrosive residues. (2022 CEC §110.12(B))
• Ensure access and working space is provided and maintained around electrical equipment. (2022 CEC §110.26)
• Ensure electrical equipment is protected from physical damage. (2022 CEC §110.27(C))
• Ensure electrical wiring is contained within conduit and junction boxes. (2022 CEC §110.31 (B)(1)) It should be noted that copper wiring will corrode in the presence of ammonia vapor and could cause a short-circuit.