panelboard
- Thread starter rose1981
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- Location
- Lockport, IL
- Occupation
- Semi-Retired Electrical Engineer
What voltage? If you mean 120/208V, then yes, so long as you protect the panelboard at 150 amps or lower. You would be wasting some of the capacity of the transformer, but that is not a code issue.
Yes, its 480V on the primary and 120/208V on the secondary. So the main bus of the panelboard shall be 225A or can it be 150A too?
- Location
- Illinois
- Occupation
- retired electrician
The panel bus can be any size that is protected by the line side OCPD. That same OCPD will also be used to protect the secondary conductors of the transformer.
These items have to be sized to serve the calculated loads. They can be any size that accomplishes that. They are not required to match the output of the transformer.
The location of the OCPD will be limited by the rules in 240.21(C).
These items have to be sized to serve the calculated loads. They can be any size that accomplishes that. They are not required to match the output of the transformer.
The location of the OCPD will be limited by the rules in 240.21(C).
- Location
- San Francisco Bay Area, CA, USA
- Occupation
- Electrical Engineer
Your panel bus rating just cannot be SMALLER than the OCPD feeding it.
Also, nothing says you must use all of the capacity of the panel bus. But common sense says not to bother wasting money by connecting a panel that can be filled beyond the capacity of the transformer feeding it, unless maybe you have plans of increasing the transformer size later.
Also, nothing says you must use all of the capacity of the panel bus. But common sense says not to bother wasting money by connecting a panel that can be filled beyond the capacity of the transformer feeding it, unless maybe you have plans of increasing the transformer size later.
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