65k breakers
- Thread starter JRT
- Start date
kwired
Electron manager
- Location
- NE Nebraska
Might want to find out what breakers are series rated with your main.
Otherwise I guess the 42 and 65 should be ok, but you may spend less if a lesser rated breaker is series rated with your main.
Otherwise I guess the 42 and 65 should be ok, but you may spend less if a lesser rated breaker is series rated with your main.
Generally no problem.
You do need to determine the actual system available fault current to assure the ratings are sufficient.
It is highly possible that branch breaker with a lesser rating such as 14k or 22k can series rate with your main.
You do need to determine the actual system available fault current to assure the ratings are sufficient.
It is highly possible that branch breaker with a lesser rating such as 14k or 22k can series rate with your main.
L-L is 26,000
L-N is 13,000. 1 pole I can use 22k
The 2 & 3 pole higher than 22k are the hardest to get from Eaton. They just started to stock 65k. I was thinking for sake of availability, it would be easier to use 65k. But the main is 35k. Thanks for the info
curt swartz
Electrical Contractor - San Jose, CA
- Location
- San Jose, CA
- Occupation
- Electrical Contractor
As others have said if you main is Eaton you should be able to find the series ratings online. If not call or have your distributor call Eaton.
I have had main breakers added to panelboard builds to allow for lower rated branch breakers.
I have had main breakers added to panelboard builds to allow for lower rated branch breakers.
SoloTrade2017
New User
- Occupation
- Operations Director
Is this other than a dwelling unit? Per 110. 16
ron
Senior Member
- Location
- New York, 40.7514,-73.9925
As long as the breaker is listed for use with the panelboard or switchboard, you can use a higher SCCR. The calculated value is just the minimum.
Fred B
Senior Member
- Location
- Upstate, NY
- Occupation
- Electrician
Usually no problem adding a higher AIC rated breaker than the main so long as the main is rated to meet or exceed the potential AFC provided to it. Understand the reason for a minimum AIC on a breaker or other equipment is to provide a safe interruption in event of a fault to prevent a rapid unintended disassembly of any component within the system, that could happen if the AFC is higher than the equipment is rated to withstand.
smoothops10
Member
- Location
- FL
- Occupation
- EE
I always see a sticker on the panelboard indicating something to the effect of "The maximum short circuit current rating of this device is [...] RMS symmetrical amps, [...]V. The actual rating is limited to the lowest interrupting rating of any circuit breaker installed." Your original post and fourth post brings up an interesting point - it seems you are trying to rate the panelboard 35k for L-L-L and L-L loads and 22k for L-N loads. I haven't seen this before. I'm not saying it is wrong but generally you see a single SCCR rating on low voltage one-lines.