[BC] Re: Saving Your Own Life

[DHultsman5@aol.com]

In a message dated 10/20/2005 10:33:26 PM Central Standard Time,  
radiotech at bellsouth.net writes:


Milton, I hate to say this but if you took from one of the 120's to  
ground/neutral, You've probably just violated code. I think it's been  
since the early 70's that you were no longer allowed to do that.  The  
proper way being a 240-120 step-down transformer.

***********************************8




Every FM20H that I was involved with had two AC feeds.   A 220  VAC single 
phase feed for the blowers, control, low voltage, driver and screen  voltage,  
filaments and exciter.   The control voltage provided  the plate on coil 
voltage.
 
A 220 VAC feed  three phase with step start coming into the same  cabinet to 
a contactor and step-start circuit in the transmitter cabinet with  the ac 
going to the power supply cabinet and a three phase plate transformer for  the HV 
DC.  When the plate on control voltage is applied the HV goes  on.
 
The problem was you always had to turn off both breakers to be safe.   You 
are correct this would not meet code presently.
 
D