RonR
Member
- Location
- McConnelsville, Ohio
I have a 3R 100 Amp Square D Enclosure(just a regular breaker, not a gfci or afci). Does it make a difference which way I run power in & out of the breaker??
Circuit Breaker Question
- Thread starter RonR
- Start date
- Status
- Location
- New Jersey
- Occupation
- Journeyman Electrician
Is the breaker marked LINE and LOAD?
RonR
Member
- Location
- McConnelsville, Ohio
I don't know.
kwired
Electron manager
- Location
- NE Nebraska
If it is a plug on breaker, you can't feed the lug side unless you have a hold down device. You don't want that thing coming unplugged with exposed live jaws is the main reason I believe. If the breaker has lugs on both ends it doesn't matter unless it is marked line and load. This is not that likely with typical thermal magnetic breakers, but could be the case with an electronic trip breaker.
RonR
Member
- Location
- McConnelsville, Ohio
I had to replace the one I installed so I just purchased another one about an hour ago. it does NOT specify Line or Load anywhere on the disconnect or on the enclosed paperwork. so I guess it is ok then.
kwired
Electron manager
- Location
- NE Nebraska
Does it have lugs on both ends or is it a plug on breaker?
Like I said before a plug on breaker can be "back fed" but must have a retaining device installed.
Like I said before a plug on breaker can be "back fed" but must have a retaining device installed.
petersonra
Senior Member
- Location
- Northern illinois
- Occupation
- engineer
MCCB that have interchangeable trip units cannot be reverse fed. They will be labeled line and load. Most non-interchangeable MCCB are UL listed to be able to be reverse fed and do not have the line/load labels.
ggunn
PE (Electrical), NABCEP certified
- Location
- Austin, TX, USA
- Occupation
- Consulting Electrical Engineer - Photovoltaic Systems
If it is being backfed by a UL listed utility interactive inverter, a tie down is not required. 705.12(D)(6)
These inverters are designed to UL1741 which requires them to shut down when the grid connection is lost; if a breaker fed by such an inverter pops out, the inverter shuts down and the connection to the breaker is de energized.
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