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Section 7



The Customer’s service entrance and utilization equipment shall be installed in accordance with all local, state and National Electrical Code requirements. It is the intent of this section to provide the Customer with recommendations concerning factors that can affect both DLPUD and the Customer in the selection, installation, maintenance and operation of the Customer’s utilization equipment. DLPUD should be contacted if concerns arise that are not covered in the section.

701 Motor Protection Devices

DLPUD’s power system is designed to provide high speed reclosing of its protective devices following power interruptions resulting from lightning or other causes. In most instances these power interruptions will be of short duration (less than one second). DLPUD recommends that under-voltage motor protection to be equipped with time delay devices to permit motors to ride through these short duration interruptions. It is recommended that over-current protective devices be provided in each phase to afford some motor-running protection of three-phase, three-wire motors against “single-phasing”. DLPUD is not responsible for damage caused by “single phasing” which results from acts of nature or system operations not directly controlled by DLPUD personnel.

702 Motor Starting Currents

Generally, all motors require a starting current substantially greater than their normal running current. Where starting currents are excessive, an abnormal drop in supply voltage will result. In order to minimize the unfavorable effects of such voltage drops, it is essential that the Customer’s motors do not exceed the allowable starting characteristics.

NOTE: Customers planning to install any motor larger than 5 hp single-phase or 25 hp three-phase, must contact DLPUD. Motor installations that cause power quality problems for other customers shall be corrected at the owner’s expense.

703 Power Factor

In order to improve the efficiency of DLPUD’s distribution system, the Customer’s utilization equipment shall maintain an average power factor as close to unity as possible.

Some of DLPUD’s rate schedules include a demand charge and a penalty for an average power factor that is less than 95%. Details of the method of billing for such Customers can be obtained from the Billing & Collection Representative. For new services, it is suggested that the Customer’s utilization equipment be designed for operation at high power factor or with capacitors that are switched on and off with the equipment.

704 Wiring Adequacy

The National Electrical Code (NFPA No. 70) specifies the adequacy of wiring with respect to safety but such installations may not be efficient, convenient, or adequate for good service of future expansion of electrical use. In many instances, the installation of wiring capacity greater than minimum code requirements is strongly recommended.

705 Customer-Owned Generating Equipment

Unless authorized by written agreement, electric generating equipment installed by the Customer shall not be interconnected or operated in parallel with DLPUD system. The customer shall own, install, operate, and maintain electrical interlocking equipment, which will prevent parallel operation and such equipment shall be approved by DLPUD prior to installation.

706 Energy Conservation

DLPUD encourages the prudent and efficient use of the electric power and energy, which it provides. Customers desiring special information or other assistance regarding the efficient end use of electricity should contact DLPUD at 847-7609.

Revised 03/07