Transformer XO Bonding
- Thread starter marcus
- Start date
- Status
- Location
- Illinois
- Occupation
- retired electrician
Re: Transformer XO Bonding
Bennie,
250.30(A)(4) seems to require a grounding electode in the area of the transformer.
Don
Bennie,
250.30(A)(4) seems to require a grounding electode in the area of the transformer.
Don
- Location
- Massachusetts
Re: Transformer XO Bonding
Bennie, I know I come late to all of this and I do not mean any disrespect, but you confusing the heck out of me.
You obviously have put a lot of thought into this, if you got the chance to change things what do you see as wrong and what would you do about it?
Bennie, I know I come late to all of this and I do not mean any disrespect, but you confusing the heck out of me.
You obviously have put a lot of thought into this, if you got the chance to change things what do you see as wrong and what would you do about it?
Re: Transformer XO Bonding
Bob: I have researched the past history and origin of the separately derived system. I do not agree with the general understanding and illustrations in the Handbook, and the Soares Book.
I have no confidence in the Handbook since Joe McPartland was the author. Some of his technical descriptions have been incorrectly changed.
I have been on a crusade to correct what I believe to be a corruption of electrical science and technology.
Bob: I have researched the past history and origin of the separately derived system. I do not agree with the general understanding and illustrations in the Handbook, and the Soares Book.
I have no confidence in the Handbook since Joe McPartland was the author. Some of his technical descriptions have been incorrectly changed.
I have been on a crusade to correct what I believe to be a corruption of electrical science and technology.
Re: Transformer XO Bonding
Bob: The origin of a separately derived system was " Alternating-current Systems Without External connections".
In 1956 this title changed to " Separately derived systems to include generators. The other power sources in the definition are not AC sources for premises wiring.
The designation " Separately derived systems" was assigned for technical correctness and not by panel action.
Separately derived systems are premises wiring systems, not the power source. The power source is a component. The grounding requirements are for the premises wiring system not the power source.
When the premises wiring system is properly grounded, the power source will be properly grounded when connected.
There is a violation when grounding a transformer two times at two locations.
Bob: The origin of a separately derived system was " Alternating-current Systems Without External connections".
In 1956 this title changed to " Separately derived systems to include generators. The other power sources in the definition are not AC sources for premises wiring.
The designation " Separately derived systems" was assigned for technical correctness and not by panel action.
Separately derived systems are premises wiring systems, not the power source. The power source is a component. The grounding requirements are for the premises wiring system not the power source.
When the premises wiring system is properly grounded, the power source will be properly grounded when connected.
There is a violation when grounding a transformer two times at two locations.
- Location
- Illinois
- Occupation
- retired electrician
Re: Transformer XO Bonding
Bennie,
The transformer itself is not the complete SDS, but it is the source of power for the SDS and is a part of the SDS. The required connection to ground for the SDS must be at a point from the source of power for the SDS to the first OCPD for the system. This requires a grounding electrode connection.
Don
Bennie,
The transformer itself is not the complete SDS, but it is the source of power for the SDS and is a part of the SDS. The required connection to ground for the SDS must be at a point from the source of power for the SDS to the first OCPD for the system. This requires a grounding electrode connection.
Don
Re: Transformer XO Bonding
Don: The first overcurrent device is the premises service. The ground electrode connection is at that point, not at the source, although it can be at the source.
A premises wiring system is all inclusive, it does not say one, or some, of the premises wiring systems.
The code making panel will rule in support of the popular belief that a transformer is a separately derived system, and requires grounding according to 250.30.
This will be a case of the the NEC changing electrical science to meet the explanation, instead of making the explanation meet the definition.
All of the substantiation documentation is in the NEC Archives, of my viewpoint. There is nothing to support the text in the handbook or Soares.
The auto-transformer reference is absurd, fictitous, and fabricated, in someone's imagination.
[ April 03, 2003, 09:34 PM: Message edited by: bennie ]
Don: The first overcurrent device is the premises service. The ground electrode connection is at that point, not at the source, although it can be at the source.
A premises wiring system is all inclusive, it does not say one, or some, of the premises wiring systems.
The code making panel will rule in support of the popular belief that a transformer is a separately derived system, and requires grounding according to 250.30.
This will be a case of the the NEC changing electrical science to meet the explanation, instead of making the explanation meet the definition.
All of the substantiation documentation is in the NEC Archives, of my viewpoint. There is nothing to support the text in the handbook or Soares.
The auto-transformer reference is absurd, fictitous, and fabricated, in someone's imagination.
[ April 03, 2003, 09:34 PM: Message edited by: bennie ]
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