scope:

This specification defines the minimum requirements for the installation of medium voltage and low voltage (600 V) electrical line distribution (ELD) power cables buried directly in the earth or installed in underground duct or conduit. The industry definition of medium voltage is between 600 V and 34,500 V nominal voltage line to ground. The work includes surveying, trenching, and backfilling, installation of cables, conduits, concrete-encased ducts, hand holes, manholes, duct markers, joints and splicing, terminating, providing surge protection, and testing of cables for acceptability of the finished ELD. In addition, this specification defines the responsibilities of the contractor with respect to safety, quality assurance, and quality control during the installation and testing of ELD systems.

This specification covers installation and acceptance testing of FAA ELD systems only. For FAA power cable maintenance directives, refer to FAA Order 6950.22.

This specification applies to installation of medium and low voltage facility electrical supply power cables and associated equipment only. These systems provide facility power from the power supplier's primary service to the service entrance power panels of FAA facilities. For detailed information on the installation of non-ELD cable systems such as control cables, fiber optics telecommunication (FOTS) cables, communication cables, etc., consult with the office of primary responsibility (OPR) for guidance. The 2400-V shielded constant current power cables serving runway edge lighting fixtures have their own standards and are not the subject of this specification. Consult the appropriate office of primary responsibility and the airport circulars for guidance. For basic separation requirements of FAA utility power cable systems from non-electrical-power cable systems, consult the section of this specification entitled, "Separation of Cables" (5.5.10). When physically integrating non-ELD cables with power cables, do not assume all of the provisions of FAA-C- 1391 apply without first coordinating with the appropriate OPR and the FAA onsite project engineer responsible for integration of multiple cable assets.

Non-ELD OPRs consist of:

a. AJW-45 Ground-Based Navaids Group,

b. AJW-46 Lighting Systems Group,

c. AJW-52 Communications Systems Engineering Group,

d. AJW-53 Telecommunication Services Group,

e. AJW-55 Air-Ground Data Communications Group,

f. AJW-56 Air-Ground Voice Communications Group,

g. Others (as applicable).