ATTACHMENT 0002 - Appendix A 5.1.1.1.pdf

16 February 2022

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A.1 ENGINEERING STANDARDS

A.1.1 Electrical

A.1.1.1 Electrical work shall comply with the latest versions of the National Electrical Code (NEC), National Electrical Safety Code (ANSI C2), the Life Safety Code (except as noted in the UFC standards), Americans with Disabilities Act and Architectural Barriers Act Accessibility Guidelines, all NFPA standards (except as noted in the UFC standards) and all applicable federal regulations. All electrical work shall also comply with the latest editions of all applicable UFC (Unified Facilities Criteria) standards, unless directed otherwise by the Government.

A.2.1 Medium Voltage Guidelines

a. Medium Voltage Distribution (Above 600 Volts)

i. Primary Service: The primary voltage system is a Delta configuration. The primary voltage sources on RIA available are at 2.4 KV and 13.8 KV. This project utilize only 13.8kV.

The 13.8 KV primary system will be extended as required from the nearest adequate source to the job site. Do not use 2.4 KV for new or upgraded services unless specifically permitted by the Government.

Appendix A RIA Electrical

Engineering Standards

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ii. New pad mounted medium voltage transformers shall be live front, without integral circuit breakers or fuses, radial connected, not loop connected. If looping of the primary system is desired, this shall be accomplished in separate pad mounted switches. All primary switching or fuses must be accommodated either in a separate pad mounted switch or in a set of pole mounted fused cutouts, not within the pad mounted transformer. To minimize the possibility of ferroresonance problems during switching operations, the distance from the fuses to the pad mounted transformer must not be more than 200 feet, and preferably less than 100 feet.

Use less-flammable, food-grade, non-toxic cooling fluid in all new pad mounted transformers. The fluid should also be of the type that will quickly biodegrade in soil and water. New pad mounted transformers must be equipped with oil fill plug, drain and sample valve, magnetic liquid level gauge, dial type temperature gauge, pressure relief valve, distribution type surge arrestors, copper high and low voltage coils and two 2- 1/2 % taps above and below normal. Provide four 8 foot fully driven ground rods surrounding the transformer interconnected with a bare 4/0 copper cable underground. The 4/0 ground shall be extended into the primary and secondary compartments from two separate points on the ground loop.

The primary voltage for transformers on the 13KV system shall be 13800 volts. Provide at least 10 clear level feet of space in front of all pad mounted transformers, whether rated at 2.4KV or 13.8KV. This space is needed for hot stick handling. The doors for the pad mounted switch shall be capable of being opened fully to the hold-open position. Paint the transformer number (to be assigned by the Government) in 2 inch high white letters on the transformer.

iii. Pad mounted switches shall be mounted on concrete pads, unless noted otherwise in contract documents. Maintain at least 10 feet clear level space in front of all doors to pad mounted switches. Maintain at least 3 feet in front of the sides for operating pad mounted switches. The pad shall be minimum 8 inches thick, laced on well compacted gravel sub base (95% modified proctor; CA-6 gravel) so that the top of the slab is a minimum of 4 inches above grade at all points on the pad. Size pad to allow 12 inches of free space on all sides.

Reinforce with 6 inch by 6 inch number 6 mesh, uniformly placed 4 inches below top surface of slab. Pad mount switches are defined in UFC 3_550_01 Section 3-7. Pad-mounted

Page A-3 sectionalizing termination cabinets defined in Section 3-8 are prohibited RIA.

iv. Provide spill containment for new pad mounted transformer installations. See RIA Master Specifications, Section 16321 for more details.

v. Medium voltage cable shall be copper conductor, type EPR, 133% insulation with extruded semi conducting EPR insulation screen. All terminations, whether indoors or outdoors, shall be of the skirted type to minimize the possibility of tracking. Label all medium voltage cables at all terminations and at all manholes to match the standards given the Arsenal Master specifications. The 13800 volt cables shall not be T or Y-spliced to minimize problems troubleshooting and repairing these cables in the future.

vi. Unless noted otherwise, in projects involving the removal of existing medium voltage transformers, the Government shall have the option of keeping the transformer as a spare, and having the contractor deliver the transformer to a storage facility on the Island. In the event that the Government chooses not to keep the transformer, and the transformer is liquid-filled, for transformers with mineral oil or other cooling fluid the contractor is to test the oil/fluid to determine level of pcbs.

Provide the Government with written test results from the testing lab. The pcb test results shall give both the transformer T-number and manufacturer and serial number corresponding to each of the test results. Furnish the written results of the pcb tests prior to transporting the oil for recycle or disposal. If the tests indicate PCB <2ppm, then the used oil/fluid is considered a non-pcb item and can be manifested for recycle as a non-hazardous oil/fluid.

A certificate of recycle is required to be submitted to the RIA Environmental Office. If tests indicate pcb between 2 and 50 ppm, per TSCA regulation 40 CFR 761.2(e), the used oil/fluid must be manifested and marketed only to qualified incinerators, marketers of off-specification used oil/fluid, or boilers and industrial furnaces. A certificate of recycle is required to be submitted to the RIA Environmental Office. If tests indicate pcb > than 50ppm, used oil/fluid must be manifested to a qualified facility for incineration. A certificate of disposal is required to be submitted to the RIA Environmental Office. Regardless of the pcb test results, review and approval by RIA Environmental Office of the transporter and facility that will

Page A-4 be used for disposal is required. Signatures on all disposal documentation, including profiles and manifests will be made by the RIA Environmental Office. All wastes will required a certification of recycle or a certificate of disposal. After the oil/fluid has been removed from the transformer, provide the Government with documentation about the destination of the transformer carcass and approximate weight.