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What is NEC 450.3 Transformer Overcurrent Protection about?

NEC 450.3 specifies requirements for overcurrent protection of transformers. For transformers over 600V in unsupervised locations with impedance under 6%, the primary protection must be rated at 300% of the primary current and secondary protection rated at 125% of secondary current. For impedance of 6-10%, primary protection is rated at 300% and secondary at 225% or 250%. In supervised locations, primary protection is rated at 250% or 300% of primary current.

Author

ajaykumarparikh

Language

EN