NEC? question
- Thread starter drhoads
- Start date
- Status
- Location
- Lockport, IL
- Occupation
- Semi-Retired Electrical Engineer
Re: NEC? question
Interesting question. My answer would be ?No.? Here?s why:
We use the term ?disconnect? more frequently in the context of a motor or other component. The function of a disconnect is to completely remove power from the component. It cannot do that job, if it is within the enclosure of the component. If you turn off the main breaker, you still have power inside the main panel (i.e., on the utility side of the main breaker).
Just out of curiosity, why do you ask?
Interesting question. My answer would be ?No.? Here?s why:
We use the term ?disconnect? more frequently in the context of a motor or other component. The function of a disconnect is to completely remove power from the component. It cannot do that job, if it is within the enclosure of the component. If you turn off the main breaker, you still have power inside the main panel (i.e., on the utility side of the main breaker).
Just out of curiosity, why do you ask?
- Location
- Mission Viejo, CA
- Occupation
- Professional Electrical Engineer
Re: NEC? question
Please be more specific about the application you have in mind. This is not a simple "yes or no" question.
Please be more specific about the application you have in mind. This is not a simple "yes or no" question.
Re: NEC? question
I am an electrical apprentice and trying to swim through the code book. I am involved in wiring a "Habitat For Humanity" house with a group of other apprentices under the watchful eye of a master electrician. One of the questions he asked me was the one in this post. I tried to find something in the code book, but haven't yet.
I am an electrical apprentice and trying to swim through the code book. I am involved in wiring a "Habitat For Humanity" house with a group of other apprentices under the watchful eye of a master electrician. One of the questions he asked me was the one in this post. I tried to find something in the code book, but haven't yet.
- Location
- Mission Viejo, CA
- Occupation
- Professional Electrical Engineer
Re: NEC? question
First, welcome to the site
"Disconnecting Means" is a defined term in Article 100:
First, welcome to the site
"Disconnecting Means" is a defined term in Article 100:
In this case, the term is defined by "use" of the device. Does the application in mind fit the definition?
- Location
- Illinois
- Occupation
- retired electrician
Re: NEC? question
charlie,
Don
charlie,
But that main breaker would be the service disconnect.
Don
jimwalker
Senior Member
- Location
- TAMPA FLORIDA
Re: NEC? question
There is voltage still present in any disconect on the line side
There is voltage still present in any disconect on the line side
- Location
- Lockport, IL
- Occupation
- Semi-Retired Electrical Engineer
Re: NEC? question
When I see the word ?disconnect,? unless there is reason to suspect a different meaning, I generally interpret it to denote a ?disconnecting means? for a component some distance from the disconnect. Thus, opening the disconnect takes all power away from the component being served. But when I see the phrase ?service disconnect,? I am not sure (until I see additional information) as to whether you are talking about a component inside the main panel or a component further upstream.
Both true. But the question did not ask about a service disconnect, and it wasn?t clear what the question meant by use of the word ?disconnect.? It might just be a question of differences in conversational language.
When I see the word ?disconnect,? unless there is reason to suspect a different meaning, I generally interpret it to denote a ?disconnecting means? for a component some distance from the disconnect. Thus, opening the disconnect takes all power away from the component being served. But when I see the phrase ?service disconnect,? I am not sure (until I see additional information) as to whether you are talking about a component inside the main panel or a component further upstream.
speedypetey
Senior Member
- Location
- Hudson Valley, NY
Re: NEC? question
Service disconnect or not, there will always be voltage present at the line side terminals.
IMO, a main breaker is a disconnect. It removes power from everything on the load side of it's terminals
Service disconnect or not, there will always be voltage present at the line side terminals.
IMO, a main breaker is a disconnect. It removes power from everything on the load side of it's terminals
charlie
Senior Member
- Location
- Indianapolis
Re: NEC? question
A question was asked about 110-22 changes in the identification of disconnecting means in the 1994 period.
This section did not change from the 1990 edition where marking for the new series rating was added until the 2002 edition.
A question was asked about 110-22 changes in the identification of disconnecting means in the 1994 period.
This section did not change from the 1990 edition where marking for the new series rating was added until the 2002 edition.
- Status