02/22/2026
480V line side of disconnect to main transformer; main 200A disconnect off.
I've been having issues with the A phase of a 75kVA 3 phase transformer & when I was doing maintenance & a load test for excessive noise, the wire appeared to have a loose connection; whereas the black & blue were more taught. The expansion & contraction dur to loose connection, caused the lug screw to seize in the lug. I was able to remove the wire by wiggle back & forth by hand!! Luckily enough, at 9:30pm, my customer had a spare disconnect. Replaced the lug with the exact same out of a seperate device. Finished with some de-ox to slow the thermal expansion/contraction of the termination point.
When excessive vibration is present consistently in an area with electrical distribution/ devices, preventative maintenance should be a priority in your electrical system!! Anti-vibration pads under the mounting holes of a compressor & transformer can make a HUGE difference. Unfortunately, the damage is done to the coil of the transformer, but, the problem, with proper maintenance, should never occur again.
Give IN-N-OUT a shout to maintain your electrical system. Whether that may be your home or your work place, allow me to make you feel safe.
780-838-5843
