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kherr
Premium
join:2000-09-04
Collinsville, IL
Reviews:
·Charter

Backfeed breakers ... are they the same .....

..... as a regular breaker (Square D is my brand) ?? Or do they make special breakers (never have seen any listed, but it's not like everyone would need one). HD finally got the generator I was looking at back in stock a town over and have some time to devote to the cause ......

Be Prepared !!



John Galt
Forward, March
Premium
join:2004-09-30
Happy Camp
kudos:6

If the breaker is NOT labeled with "line" and "load", it is suitable for backfeeding.


kherr
Premium
join:2000-09-04
Collinsville, IL

I figured that, but better to ask. Thanx



John Galt
Forward, March
Premium
join:2004-09-30
Happy Camp
kudos:6

No problem.

For molded case CBs, the issue is solely one of labeling rather than any functionality.



leibold
Premium,MVM
join:2002-07-09
Sunnyvale, CA
kudos:10
Reviews:
·SONIC.NET
reply to kherr

For residential use, Square D makes loadcenters (breaker panels) for QO series breakers and HOM series breakers (they are not interchangeable).

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
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kherr
Premium
join:2000-09-04
Collinsville, IL

I'm QO all the way. The retaining kit came today and stated to use with "backfeed breakers only", hense the question.



John Galt
Forward, March
Premium
join:2004-09-30
Happy Camp
kudos:6
reply to kherr

Retainers are required any time you use any CB other than a "integral main" for connection to the power source.

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.



leibold
Premium,MVM
join:2002-07-09
Sunnyvale, CA
kudos:10
Reviews:
·SONIC.NET
reply to kherr

The only limitations regarding backfeeding that I could see were:

- 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.
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