Was called there this morning. Evidently someone was doing something on the 15th floor with lighting and the main tripped.
Sure enough tripped main. I opened all downstream vacu-break switches, reset trip mechanism and reset main.
Turns out idiots replaced light fixtures with 120v ballasts on 277v circuit. Turned them on...cablamo!
This needs to be rectified.
There is a dial on the trip mechanism- .1, .2 .3 .4 etc. It is set currently at .1 I suspect this is time?
Do I need to have a testing co. come out and check this trip mech. out. See if it is wired correctly?
This has been in place for years. Why all of a sudden is this happening? I am pretty sure someone else has created an arc or fault before downstream. Could the mechanism be going bad? It is a ITE SB3 Switchboard. Three cabs. One for metering, second has Mswitch and volt and amp meter, third has vacu-break switches for branch circuits.
