I'm looking for the official reason on why the secondary overcurrent protection for a service transformer has to be within 10 feet of the transformer. I realize that if the service transformer is outside, Article 240.21(C)(4) allows the secondary overcurrent protection to be any distance away. But what if the transformer is location inside of the building? Is it because the conductors can be accessed between the transformer and disconnect?
I currently have a service transformer that has the secondary overcurrent disconnect 35 feet (conductor length) away from the transformer. I'm trying to answer the question on why the disconnect has to be moved closer. Thanks.
I currently have a service transformer that has the secondary overcurrent disconnect 35 feet (conductor length) away from the transformer. I'm trying to answer the question on why the disconnect has to be moved closer. Thanks.