Square D 100 Amp Main

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Ben Franklin

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Philadelphia, PA
Your customer would be much better off financially to simply replace the entire panelboard. Not only is that particular breaker very, very expensive; you will likely need to install a used one which may not last very long or may not function properly.
 
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electricguy

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British Columbia Canada
Thanks I been quoted 350.00 from my supplier as they did mention there still may be some around. It would have to come from the USA I have giving them the panel change option they asked if i could try and find the breaker first.
 
Dennis Alwon

Dennis Alwon

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Okay I am a little ignorant here. What type of panel has a dp breaker where the two phases are opposite each other. It appears that is what this breaker is designed for.

IMG_2662.jpg
 
C3PO

C3PO

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Tennessee
Dennis it is basiclly just a QO panel, you are just hooking up one phase on oneside and the onter phase on the other. I have replaced a lot of them over the years. My guess is at the time that is the only way square D could make the 100A two pole breakers.
 
Dennis Alwon

Dennis Alwon

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C3PO said:
Dennis it is basiclly just a QO panel, you are just hooking up one phase on oneside and the onter phase on the other. I have replaced a lot of them over the years. My guess is at the time that is the only way square D could make the 100A two pole breakers.
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I still don't get it. The phases on every panel I ever hooked up are not opposite each other. Thus the "A" phase would be on the left top and the "A" phase is also on the right Top. B phases is next etc. How is this buss arranged that it would accommodate that design.

Maybe I am looking at thiis wrong. I am assuming this would fit anywhere in the panel or is this only used for the main? I still dom't see how a standard DP would work. I have seen many Sq. D panels but never installed any and they did not have mains like that.
 
C3PO

C3PO

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Location
Tennessee
Dennis Alwon said:
I still don't get it. The phases on every panel I ever hooked up are not opposite each other. Thus the "A" phase would be on the left top and the "A" phase is also on the right Top. B phases is next etc. How is this buss arranged that it would accommodate that design.

Maybe I am looking at thiis wrong. I am assuming this would fit anywhere in the panel or is this only used for the main? I still dom't see how a standard DP would work. I have seen many Sq. D panels but never installed any and they did not have mains like that.
Click to expand...

The buss arrangement is the same. The lug on the left side of the breaker is feeding the top "clip" of the breaker. The lug on the right side is feeding the "clip" on the bottom of the breaker.
 
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electricguy

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Location
British Columbia Canada
i did not pull this breaker so i have no idea what the buss looks like under the breaker. But the visible buss feeding the QO branch breakers looks the same as an XO style so I am hoping that under the breaker the stabs the buss are the same as QO for the Main Breaker
 
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electricguy

Senior Member
Location
British Columbia Canada
In Canada we have a barrier between the main breaker and the branch breakers so basically this is a 2 part cover a cover for the main breaker section and a cover for the branch circuits. I think this cover would allow the breaker to stay in place.
 
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jim dungar

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Wisconsin
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PE (Retired) - Power Systems
The picture Dennis posted is that of a Q12100TF (as in top feed). It went across the entire width of the panel and the conductors entered the 'side' of the breaker. Replacing this with a standard QO2100 is possible except your incoming line conductors will probably not be long enough.

When the Q12100 was obsoleted, back in the 80's, it was replaced with the QO2100. I do not recall that a QO2100TF was ever produced unless it was as a special 'form and fit' replacement.

In the old style panels the neutral bar would not be in the way, it would have been located at the end of the panel, usually between the breaker lugs.
 
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