High Leg Power Calculation
- Thread starter Tank11
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- Placerville, CA, USA
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- Retired PV System Designer
Neither. The total power available will depend on the mix of 120/20 and three phase loads as well as whether the service transformers are same size.
If all you are concerned about is the load the OCPD will allow, the max would be with fully balanced three phase after adding in the 120/240 load.
Your first number.
If the bulk of the load is A to ,C, then the second number.
If all you are concerned about is the load the OCPD will allow, the max would be with fully balanced three phase after adding in the 120/240 load.
Your first number.
If the bulk of the load is A to ,C, then the second number.
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- San Francisco Bay Area, CA, USA
- Occupation
- Electrical Engineer
3 phase kVA would be A x V x 1.732, your 3 phase voltage is 240V. Don't get hung up on the High leg.
If what you want to know is how much SINGLE PHASE power you have available on that system, that's a different matter. You can't calculate that, you have to read it. Depending on the configuration of the transformer(s) feeding this system, there will be restrictions on the amount of 120V power you can use from it. That should be in the description of your service from the PoCo. Some are limited to just 5% of the transformer rating for example.
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