200.3

[don_resqcapt19]

Re: 200.3

The key words in the Article 100 definition of SDS are "supply conductor". In my opinion, an equipment grounding conductor is not a supply conductor. I have submitted a proposal on this subject for or the '05 code and we will have a panel statement in July when the ROP is published.
Don

 

[ronaldrc]

Re: 200.3

Ed,

My using of the word implies is the way I and evidently a lot of others in the field
interpret what the sentence separately derived means. Like Bennie I think the meaning should be explained better and if they are not going to have a isolated customer system in the US then say so instead of leaving us in the dark.

Seems to me this is a useless argument since everyone knows what we are talking about
and just can?t decide on what its true meaning was meant to be.

As most of you can see I?m not a grammar professor so I?m going to stay out of this part
of the battle.

The real issue here and my only concern is, should the primary and secondary grounded
conductors be tied together to make a better and safer system?

I know there are some faults and events that will take place where one system will protect
life and property better than the other.

But taking most of these situations and weighing them which would come out on top?

1.-Having the whole systems grounded conductors tied to one another?

or

2.-Having a real separately derived system of which the customers power is completely and truly electrically separated from the high voltage of the utility system?

Ronald

[ March 24, 2003, 09:31 AM: Message edited by: ronaldrc ]

 

[bennie]

Re: 200.3

Don: The panel is going to agree with you. They have made it clear in the Soares Book, Chapter 12.

The transformer connections, in the Soares book, are of both configurations, MGN and electrically separate secondary. Both are called separately derived systems.

It is obvious the authors do not know much about transformer application. You can't have it both ways.

On a grounded wye/grounded wye, the star point (neutral/ground) is connected to both the primary and secondary of the transformer. If this wire is white, it is a circuit wire, if it is green it is not?

 

[bennie]

Re: 200.3

Don: I have written to every individual involved in the Soares Book.

I have asked for technical engineering data to back up calling a transformer a separately derived system.

I also asked for documented data concerning the auto-transformer statement.

The curator, at the NEC archives, informs me there is no such data in existence. The information is only a fabrication by an individual, after 1984.

I have recieved only silence from the code experts.

[ March 24, 2003, 10:00 AM: Message edited by: bennie ]