Yes it's an older installation. The transformer is one of 3, single phase Allis-Chalmers "Curvacore" transformers and were used to step down 3 phase 4160V to 208/120V. I did a web search and couldn't find any info on them. All 3 were leaking oil and have been replaced. Greg
They were tagged as PCB free, but I never touched it. There was a service tag on it at least. We were supposed to get an oil sample, but the sampling valve was so corroded we were afraid it would break. I see the same PCB free tags on oil filled utility breakers, but we're replacing those with SF6 dead tank breakers.
OK, now we know 'customer owned', PCB free, a 'mat' setup, and old.
I had a few locations in Union County, NJ that I did demo and bringing the elec into the 20th century. Two locations were PCB issues,confirmed by my samples sent to a lab. The legal disposal was $$$ but necessary and a lot cheaper then dealing with a contamination issue. One of these sites had 'leakers' but thecontamination was limited to the concrete slab and 3' of soil.
Both of the above sites were replaced with POCO 2000KVA pad mounts and respective gear.
BTW, Welcome to ECN Forums from one of the 'Jersey Guys'!!
Our "leakers" were on concrete so no oil went into soil, but the disposal fee was high (from what I heard). We also replaced the 4160 with a new 12.47KV service & POCO 300KVA 3 phase pad mount and gear. Some of the old stuff I see is almost beyond belief that somebody wasn't killed. Also, thanks for the welcome! Greg