[BC] Re: Saving Your Own Life

[Mike McCarthy]

I believe the Code doesn't allow a branch circuit to be subdivided in 
a manner which would include another overcurrent device external to 
the device being powered unless a load center is the dividing device.

Thus, adding a breaker to one phase of a 3 phase box to power a single 
phase circuit is NOT permitted unless that tap takes place in the 
powered device. 


MM


> On Friday 21 October 2005 10:04, Mike McCarthy wrote:
> > Harris SX series has two (Control and RF), plus whatever was wired 
into the
> > rack bay section in front.  Some stations with SX1 and 2.5 wired 
two
> > circuits for the box, others 1.  On the 5, you had to use two as 
the
> > control side was single phase the RF was three phase.
> 
> The Harris DX25U I put in at WKJV had two sources of AC as well; 480 
three 
> phase for the RF, and 120 single phase for control.  The recommended 
> installation was with two separate breakers, as well, rather than 
use the 
> three phase feed off a step-down.  In the case of WKJV, the only 
voltage 
> available was 120/208, so a fairly sizable step up transformer was 
used to 
> derive the 480.
> -- 
> Lamar Owen
> Director of Information Technology
> Pisgah Astronomical Research Institute
> 1 PARI Drive
> Rosman, NC  28772
> (828)862-5554
> www.pari.edu
> 
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Reply to <towers at mre.com>
>From my traveling acount...