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 Post subject: Bus side/Line side versus Line side/Load side
PostPosted: Wed May 01, 2019 3:59 pm 

Joined: Mon Apr 29, 2019 5:24 pm
Posts: 7
Location: Phoenix, AZ USA
I'm reaching out to all the brain power on this thread.

Does anyone know the history and where (if one exists) for the official definition of "Line Side" and "Load Side"?

Countless standards such as the NFPA 70 (NEC), 70E, IEEE 1584, C37.20.2, and even electric equipment uses the terms throughout the text and most everyone who's worked in the electrical trade for length of time understands what they mean. But for the life of me, I can't find where it originated from or if there's an official definition somewhere.

However we have GE switchgear, Magne-Blast breakers and ground trucks (4.16 and 13.5 kV) that uses the term "Bus Side" and "Line Side". And as you would guess, the "BUS Side" is the supply side where as the "Line Side" is the output side to the load. Yes, the word "Line" when used with GE medium voltage switchgear is 180 degrees opposite of what we've been taught throughout our careers.

Any ideas out there?


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 Post subject: Re: Bus side/Line side versus Line side/Load side
PostPosted: Fri May 03, 2019 8:23 am 
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Joined: Tue Jan 13, 2009 5:00 pm
Posts: 532
I don't have any insight on the history, but have a comment on the subject. In a radial system, "line side" is ambiguous, since the line in question could be coming from a source or leading to a load. Suggest using "source" and "load" side for these systems. Networked systems, where flow could be from multiple directions, should use "bus" and "line" sides.


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 Post subject: Re: Bus side/Line side versus Line side/Load side
PostPosted: Mon May 13, 2019 11:56 am 
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Joined: Wed Jun 04, 2008 9:17 am
Posts: 428
Location: Spartanburg, South Carolina
I know that it doesn't match the usual definitions, but to me, it makes sense to call the side connected to the switchgear or panelboard bus the Bus Side. The side connected to wires, either source or load, call Line Side.


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