http://www.dslreports.com/forum/Backfeed-breakers-are-they-the-same-27823432 en Wed, 22 May 2013 22:11:14 EDT Wed, 22 May 2013 22:11:14 EDT http://www.dslreports.com/forum/Re-Backfeed-breakers-are-they-the-same-27823892
- QO-GFI (combination circuit breaker GFCI) should not be used as main breaker or backfeed breaker.
- Some Square D panels with 100A main breaker can only be used with backfeed breakers up to 70A.

You should be fine with any standard 2-pole QO breaker.
--
Got some spare cpu cycles ? Join Team Helix or Team Starfire!]]> http://www.dslreports.com/forum/Re-Backfeed-breakers-are-they-the-same-27823892 Fri, 14 Dec 2012 18:36:19 EDT http://www.dslreports.com/forum/Re-Backfeed-breakers-are-they-the-same-27823882
The intention is to keep it from dislodging during a fault event.

Say you have a "main lugs only" panel, but want to have a "local" main CB for a disconnecting means. You would then need to install a retaining bracket.]]> http://www.dslreports.com/forum/Re-Backfeed-breakers-are-they-the-same-27823882 Fri, 14 Dec 2012 18:33:11 EDT http://www.dslreports.com/forum/Re-Backfeed-breakers-are-they-the-same-27823828 http://www.dslreports.com/forum/Re-Backfeed-breakers-are-they-the-same-27823828 Fri, 14 Dec 2012 18:15:34 EDT http://www.dslreports.com/forum/Re-Backfeed-breakers-are-they-the-same-27823808
When using a plugin-style breaker (QO and HOM both are) as backfeed breaker then a retaining kit is required to hold the breaker in place (prevents the breaker from popping out of the panel bus). This also applies to most other brands of residential breakers.

A retaining kit is not needed for bolt-on breakers (such as Square D QOB breakers) which are more common in commercial/industrial applications.

Edit: fixed spaces in URL
--
Got some spare cpu cycles ? Join Team Helix or Team Starfire!]]> http://www.dslreports.com/forum/Re-Backfeed-breakers-are-they-the-same-27823808 Fri, 14 Dec 2012 18:08:43 EDT http://www.dslreports.com/forum/Re-Backfeed-breakers-are-they-the-same-27823698
For molded case CBs, the issue is solely one of labeling rather than any functionality.]]> http://www.dslreports.com/forum/Re-Backfeed-breakers-are-they-the-same-27823698 Fri, 14 Dec 2012 17:35:52 EDT http://www.dslreports.com/forum/Re-Backfeed-breakers-are-they-the-same-27823518 http://www.dslreports.com/forum/Re-Backfeed-breakers-are-they-the-same-27823518 Fri, 14 Dec 2012 16:50:56 EDT http://www.dslreports.com/forum/Re-Backfeed-breakers-are-they-the-same-27823471 http://www.dslreports.com/forum/Re-Backfeed-breakers-are-they-the-same-27823471 Fri, 14 Dec 2012 16:38:21 EDT http://www.dslreports.com/forum/Backfeed-breakers-are-they-the-same-27823432
Be Prepared !!]]> http://www.dslreports.com/forum/Backfeed-breakers-are-they-the-same-27823432 Fri, 14 Dec 2012 16:30:43 EDT