Sizing Transformers'Overcurrent ProtectionLooking for the other Transformers? The charts below are based on the Article 450 of the National Electrical Code as well as tried-and-true methods commonly used in the field. These charts are used to size the overcurrent protection for the transformer on both the primary side and the secondary side. The overcurrent protection is typically a circuit breaker.
Single Phase Transformers are not used as often as three phase transformers. Where three phase transformers are common in commercial distribution applications, single phase transformers are used for specialty applications or small commercial buildings. An example of this would be a 480v,1ø circuit supplying power, via a step-down transformer, to a 240v,1ø wood lathe in a cabinet-making shop.
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