Every main breaker load center I have seen has a non-removable main breaker. Is it a code violation to install a main lug only panel, but use a 2-pole stab in breaker as the panel?s main breaker? I have always been under the assumption that this is a code violation but have been unable to find the specific code article. Would I be correct in assuming that the panel is being used other than what it is listed for and therefor be in violation of listing?
Main breaker/Main lug
- Thread starter dirk
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BAHTAH
Senior Member
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- United States
Re: Main breaker/Main lug
It is not a code violation as long as you also install the retaining clip the manufacture provides that holds the breaker so it cannot be removed. see 408.16(F)
[ September 24, 2003, 11:10 AM: Message edited by: grant ]
It is not a code violation as long as you also install the retaining clip the manufacture provides that holds the breaker so it cannot be removed. see 408.16(F)
[ September 24, 2003, 11:10 AM: Message edited by: grant ]
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Re: Main breaker/Main lug
If you need further documentation here is a link to a free Siemens quickSTEP online course entitled "Basics of Load Centers". It's very basic but it does cover the topic you are discussing and should adequately clear up the question. It takes well less than twenty minutes to run through it. This module does include code citations.
http://www.sea.siemens.com/step/templates/lesson.mason?centers:1:1:1
Here is a link to the other free Siemens quickSTEP online courses on their product line:
http://www.sea.siemens.com/step/downloads.html
I have not viewed any of these, except the Load Center one so I happen to know your answer is there.
[ September 24, 2003, 11:15 AM: Message edited by: awwt ]
If you need further documentation here is a link to a free Siemens quickSTEP online course entitled "Basics of Load Centers". It's very basic but it does cover the topic you are discussing and should adequately clear up the question. It takes well less than twenty minutes to run through it. This module does include code citations.
http://www.sea.siemens.com/step/templates/lesson.mason?centers:1:1:1
Here is a link to the other free Siemens quickSTEP online courses on their product line:
http://www.sea.siemens.com/step/downloads.html
I have not viewed any of these, except the Load Center one so I happen to know your answer is there.
[ September 24, 2003, 11:15 AM: Message edited by: awwt ]
Re: Main breaker/Main lug
Thanks Grant,
That is just what I was looking for. I don?t recall however seeing a clip that comes with MLO panels. I assume that you mean you can purchase a conversion kit/clip for the specific panel? Also I see an awful lot of this scenario in commercial buildings. Is it safe to assume that bolt on breakers covers this topic? Thanks again.
Thanks Grant,
That is just what I was looking for. I don?t recall however seeing a clip that comes with MLO panels. I assume that you mean you can purchase a conversion kit/clip for the specific panel? Also I see an awful lot of this scenario in commercial buildings. Is it safe to assume that bolt on breakers covers this topic? Thanks again.
george t. everett
Senior Member
- Location
- New York
Re: Main breaker/Main lug
Squqre D has main breakers that can be installed by removing the lugs in a main lug panel. I think that 70 amp is the smallest breaker.
Squqre D has main breakers that can be installed by removing the lugs in a main lug panel. I think that 70 amp is the smallest breaker.
websparky
Senior Member
- Location
- Cleveland, Ohio
Re: Main breaker/Main lug
The above is referring to "plug-in" type.
The "bolt-on" or "screw-on" commercial breakers do not require any additional clips.
The above is referring to "plug-in" type.
tonyi
Senior Member
Re: Main breaker/Main lug
George, 50A is the smallest main you can get for the convertable QO/Hom MLO panels.
[I just picked up a 60A main a few days ago for a subpanel disconnect (didn't want to burn two slots for a backfed disconnect) and researched what was available and saw the 50A in the list]
George, 50A is the smallest main you can get for the convertable QO/Hom MLO panels.
[I just picked up a 60A main a few days ago for a subpanel disconnect (didn't want to burn two slots for a backfed disconnect) and researched what was available and saw the 50A in the list]
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