408.36(D) - back-fed plug-in type breakers

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bbaumer

Senior Member
Location
Indiana
Hi all. I have a generator/utility main branch mounted breaker setup with a Square D QO2DTI interlock on a subpanel so as to prevent closing both the utility and generator mains together. It has been in place many years.

Both the utility main and the generator main are back-fed of course.

A friend of mine wants me to install a similar set-up for him.

I was looking through the code to make sure this was still OK and remembered reading about 100A and larger main breakers needing to be bolt-in, not stab-in. I see in 408.36(D) back-fed devices need to be "secured in place by an additional fastener...".

Does Square D make a kit or device for a QO loadcenter for back-fed branch devices?

I know there are other solutions for the utility/generator main out there and that is not my question. The QO2DTI interlock is a simple and cheap solution and is why I was looking at this. I just want to know how to comply with 408.36(D) and still use a QO loadcenter with stab-ins, if it is possible.

Thanks.
 

bbaumer

Senior Member
Location
Indiana
Also, would the loadcenter cover count as an additional method of securing in place? Can't move the breakers with the cover on.
 

iwire

Moderator
Staff member
Location
Massachusetts
bbaumer said:
Does Square D make a kit or device for a QO loadcenter for back-fed branch devices?.

Yes Square D makes a nice generator interlock kit that includes hardware to fasten the back fed breaker.


bbaumer said:
Also, would the loadcenter cover count as an additional method of securing in place? Can't move the breakers with the cover on.

No
 

bbaumer

Senior Member
Location
Indiana
iwire said:
Yes Square D makes a nice generator interlock kit that includes hardware to fasten the back fed breaker.




No


the only kit I am familiar with is the QO2DTI and I don't think it secures the breakers.

Do you know a part number?

thanks,
bbaumer
 

iwire

Moderator
Staff member
Location
Massachusetts
The cut sheet I linked to has the model numbers and shows the breaker retainer.

I have only installed one but I was quite impressed with the easy installation and the quality of the parts.

They even send a metal template for drilling the holes in the panel cover.
 
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mdshunk

Senior Member
Location
Right here.
bbaumer said:
the only kit I am familiar with is the QO2DTI and I don't think it secures the breakers.

Do you know a part number?

thanks,
bbaumer
This is the one I use, and it does secure the breakers:

P1010181.jpg


P1010176.jpg
 

mdshunk

Senior Member
Location
Right here.
peter d said:
That's terrible...that all needs to be in pipe. :roll: ;)
It's not all my work, but you do the best with what you've got. It's not done either in that pic. I did the low stuff in pipe, so give me a break. :smile:
 

peter d

Senior Member
Location
New England
mdshunk said:
It's not all my work, but you do the best with what you've got. It's not done either in that pic. I did the low stuff in pipe, so give me a break. :smile:

Are you kidding me? I couldn't care less what wiring method you use...use NM cable if you want! :D
 

mdshunk

Senior Member
Location
Right here.
peter d said:
Are you kidding me? I couldn't care less what wiring method you use...use NM cable if you want! :D
All right, that does it! You're gonna fool around and make me post a picture of the generator "inlet".


P1010177.jpg
 

stickboy1375

Senior Member
Location
Litchfield, CT
mdshunk said:
All right, that does it! You're gonna fool around and make me post a picture of the generator "inlet".


P1010177.jpg


I don't think I would have done that only to protect my self from some jacka$$ using a generator indoors. yeah I know, can't protect all of them. But lawyers are something these days.
 
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