Responded to a service call to inspect a power failure affecting a commercial walk-in refrigerator in the kitchen. Upon troubleshooting, identified that the circuit breaker had come loose and was no longer making proper contact with the panel’s bus bar. Additionally, discovered that the circuit was wired with conductors that were oversized for the breaker's terminal lugs, preventing a secure connection. Resolved the issue by re-terminating the tap using correctly sized wire, then reinstalled the breaker to ensure a secure and reliable connection. Verified proper voltage at the breaker and confirmed the refrigerator was operational and cooling as expected.