Question about Square D Qda32125 3pole 125amp 240v Circuit Breaker
You will not only need to change the circuit breaker but you will also most likely have to change the wire size running from your machine/disconnect/receptacle. For 125 amps you will need at least 2AWG copper wire
Posted on Mar 27, 2013
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Posted on Jan 02, 2017
I would tend to agree with "Tripleauto". If you do not disconnect the electrical supply to the house, you run the risk of having 240 volts at up to about 75 KVA coursing through your body. Needless to say, before the transformer blows out or someone cuts off the power, your corpse will be mostly ash. Call the power company to co-ordinate having the power turned off while you or your electrician do the work. Once the power is off, swapping out the main breaker is a relatively simple job, assuming you can find an exact replacement. If there is no exact replacement, as in the panel is fairly old and the breaker is no longer available, you will end up having to replace the whole panel or add a 125 amp breaker in a separate enclosure in an accessible location between the meter socket and the breaker box, preferably within reach of the breaker panel. The International Residential Code requires a disconnct where there are more than six breakers needed to turn off all power to the dwelling. Check with your local Building Code office before doing anything.
--Peter Nomikos, International Code Council Master Code Professional
Building and Zoning Director, City of Mauldin, SC
Posted on Feb 26, 2009
The total panel ampacity should be rated first by your load, then by the main breaker. if you are feeding it out of another box, it will probably be a double 100amp. In that case you will probably use 100amp SER cable.
Posted on Apr 10, 2009
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