Doc’s Diagnosis – Blowing A Fuse

Craig successfully diagnosed a 1000 ton chiller that was blowing a fuse intermittently. The customer previously had spent a large amount of money including replacing the motor at the cost of $50,000 with no success! The fuse continued to blow on occasion leaving the buildings hot and the occupants and customer dissatisfied. Craig identified a potential wire issue in 1 of a possible 20 large conductors. The damaged portion of the wire is shown below. What started as a pin-hole size puncture on the wire, turned into an eroded section of wire. The damaged 500 MCM wire was replaced, all at a fraction of the cost of the prior, unsuccessful attempts.