Re: [TCML] RSG Electrical Connections

[Dave Sharpe <sparktron01@xxxxxxxxx>]

I would resist using a common neutral for two separate branch loads.  First it is technically a violation of the NEC (each branch load should have a dedicated neutral).  Secondly the neutral would have to be oversized to handle steady state currents of two loads.  Third, it is very poor, skirting on dangerous, design practice.  There have been entire data processing centers burnt to the ground from overloaded ( glowing red hot mind you) neutrals on three phase systems with third order harmonics. 

Regards



On Feb 17, 2011, at 10:49 PM, jeremyee@xxxxxxxx wrote:

> If it is specifically for control purposes, could I run separate hots and but then a common common? I am assuming that you want the supply going to the motor filtered as well in case a streamer makes its way to the motor. Thanks for the responses!
> 
> Jeremy
> 
> 
> -------Original Email-------
> Subject :Re: [TCML] RSG Electrical Connections
> From  :mailto:glau1024@xxxxxxxxx
> Date  :Thu Feb 17 21:14:40 America/New_York 2011
> 
> 
> There's no issue with radiated emissions.  However, they should not share
> power connections, because you MUST control the NST and motor separately,
> thereby requiring separate wires.  For instance, you'll probably want to
> control the power to the NST through a Variac, and you'll want to control
> the RSG motor with a different Variac, and NEVER allow the RSG speed to go
> below ~ 60BPS with power also going to the NST (assuming an async RSG).
> 
> Regards, Gary Lau
> MA, USA
> 
> On Thu, Feb 17, 2011 at 8:13 PM, <jeremyee@xxxxxxxx> wrote:
> 
>> Hey guys and gals,
>>  Had a question that I am having a hard time finding the answer to. I am
>> trying to figure out if a certain connection scheme for powering the motor
>> of my RSG. I was wanting to share the 120 V power connection between my NST
>> bank and my RSG motor.  Is there anything less than desirable in doing this
>> (ie risk of damaging the motor) or should this be ok? If I do need to run
>> separate power connections to these can the wires be contained in the same
>> cable (or would there be radiated emission effects that might cause
>> problems)? Thanks a lot in advance!
>> 
>> Jeremy
>> Cincinnati, OH
>> Sent from my BlackBerry device from Cincinnati Bell Wireless
>> 
>> 
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