[BC] Re: [Pubtech] 3 phase power and audio

[Thomas G. Osenkowsky]

This practice has one major drawback. All eggs in one basket.
At WLAD in Danbury, CT we had a problem some years ago.
One phase would frequently fail. I had the three phases balanced
to within 2 amps. This caused two studios to go down. I solved
the immediate problem by having a DPDT switch installed by an
electrician to swap the bad phase. Saved us many times. The
power company eventually found a defective insulator on a
transformer. The building has since installed a generator.

Tom Osenkowsky, CPBE

> You are correct, sir. When we started moving additional stations into 
> our Lynchburg studios a couple of years ago I found that connecting 
> audio equipment in the rooms that I wanted to use with equipment in 
> the existing studio rooms resulted in hum. The new rooms were on a 
> different phase of the three-phase service. I had an electrician swap 
> the phase feed for the new rooms with that for some office spaces so 
> that all studios (and my engineering rooms) were on same phase, and 
> that eliminated the hum.