CUSTOMER-OWNED TRANSFORMER GUIDELINES

These guidelines are provided for use by customers who are required or desire to furnish their own transformers. Customers are advised to confer with local GPU Energy representatives while the installation is still in the design stage to verify source voltage, metering requirements and the areas of their responsibility. It is also suggested that the customer review with GPU Energy, their proposed transformer specifications, construction details and the coordination of protective devices.

Customers owning their own transformers will be responsible for the purchase, installation, operation, maintenance and replacement of such equipment and for any liability or damage claims arising from its ownership or use. Transformers shall comply with the applicable sections of Publication C57 of the American National Standards Institute (ANSI), and Publication TR1 of the National Electrical Manufacturers Association (NEMA). Transformers containing polychlorinated biphenyls (PCB) will not be acceptable.

In general, customer-owned transformers will be of the "pad type" design for ground level installation, although other types may be used with prior Company approval. When the GPU Energy supply voltage is 4 wire wye, customer owned three phase transformers shall normally have Y-Y windings and single phase units shall have the primary windings suitable for phase-to neutral connection. If the GPU Energy supply voltage is a 4 wire wye, but customer transformers must be connected Delta on the high side, then a three-phase group operated switch must be installed ahead of the transformer(s) that automatically opens on a single phase condition. Units for operation at voltages other than listed above may be approved depending on local circumstances.

The customer's equipment and installation must comply with all applicable provisions of the National Electrical Code (NEC). Particular attention should be given to Article 450, "Transformers and transformer vaults". Article 710k "Over 600 volts, nominal general", and Article 230, "Services" specifically Section H, "Services exceeding 600 volts, nominal." The customer is responsible for providing overcurrent protection and lightening arresters for customer-owned transformers. This protection may consist of fusing supplied as an integral part to the transformer or as current-limiting fuses mounted external to the transformer. The customer must consult with GPU Energy to ensure proper coordination of lightning and overcurrent devices with GPU Energy equipment.

The customer is also responsible for providing 3-phase primary disconnecting equipment in accordance with NEC Article 230-205, "Disconnecting Means", GPU Energy does not furnish primary disconnecting equipment, for operation by the customer, ahead of the customer-owned transformer.

Prior to connection of service, the wiring on customer's premises must be inspected and GPU Energy provided a Certificate of Approval issued by a GPU Energy recognized inspection agency or municipal inspection bureau (in New Jersey). All such Certificates of Approval shall state that the Customer's installation meets, at a minimum, the requirements of the latest revision of the National Electrical code. A list of agencies and inspectors in Pennsylvania is available at GPU Energy's offices.

In Pennsylvania, in case of primary GPU Energy service customers (over 600 volts), GPU Energy may, at its sole discretion, in lieu of a Certificate of Approval by a GPU Energy recognized inspection agency of municipal inspection bureau, accept a letter of certification from a Registered Professional engineer certifying that the electrical inspection on the customer's premises complies with all applicable codes.