Please refer to the attached drawing as a reference to the following:
A customer with a residential premise has elected to electrically feed his/her electrical system in a manner as shown on the attached drawing. The electric utility will be providing a 240/480V, single-phase, 3w service up to the utility's meter. At that point, the customer will be utilizing a 480v, single-phase, 2w electrical system to feed a customer owned transformer where the voltage will be stepped down to a 120/240v single-phase, 3w system. As I understand, the customer owned transformer along with the conductors on the primary and secondary sides have to be grounded as per NEC articles 250.24 (A) and 250.24 (2). Am I interpreting the code appropriately? In addition, what article in the NEC governs the size of the primary and secondary CONDUCTORS FOR SUCH INSTALLATION? Please advice and thank you in advance.
A customer with a residential premise has elected to electrically feed his/her electrical system in a manner as shown on the attached drawing. The electric utility will be providing a 240/480V, single-phase, 3w service up to the utility's meter. At that point, the customer will be utilizing a 480v, single-phase, 2w electrical system to feed a customer owned transformer where the voltage will be stepped down to a 120/240v single-phase, 3w system. As I understand, the customer owned transformer along with the conductors on the primary and secondary sides have to be grounded as per NEC articles 250.24 (A) and 250.24 (2). Am I interpreting the code appropriately? In addition, what article in the NEC governs the size of the primary and secondary CONDUCTORS FOR SUCH INSTALLATION? Please advice and thank you in advance.