AMD 01 Attachment 01.pdf

AMD 01 Attachment 01

SOW B3291

DISTRIBUTION STATEMENT D: Distribution authorized to the Department of Defense and U.S. DoD contractors

3.0 PERFORMANCE REQUIREMENTS

The performance requirements of this project include: Installation of 3 electrical bus ducts, installation of a transformer, concrete pad for transformer, new double entry door for large equipment access, a low pressure dry air space with N2 ports and exhaust hood, and man bars over ducts and penetrations in 2 places above drop ceiling. Contractor must provide Build Drawings for approval. (CDRL A012) See section 3.1 for additional requirements.

3.1 REQUIREMENTS

The location of this project is at building 3291 at NSA Crane, IN. The work will be performed in room 158 on the bottom floor of building 3291.

A) Electrical – Three new overhead, below the existing drop ceiling, 200A main breaker feeder head copper bus ducts shall be installed including arrangements of 200A 115VAC 3 phase delta, 200A 208/120 WYE VAC 3 phase, and 200A 440 VAC 3 phase. The bus ducts shall be mounted in the center of the room not to block HVAC diffusers, existing sprinkler heads, and/or current lights. The new bus duct should be modular in 10’ sections. Each bus duct section has configuration requirements. See Figure 1. 440V 3 phase power source is located in Rm156 panel F. A new 45KVA 480V-PRI/115V-SEC 3-phase delta 80 degree copper wound transformer and a new 75KVA 480V-PRI/ 208/120 WYE VAC 3 phase 80 degree copper wound transformer shall be installed on a contractor installed concrete pad outside the building adjacent to RM158. Obtain power from pump/electrical RM155 Switchboard “A” for each transformer feed. Disconnect shall be placed for each transformer. Disconnect shall be labeled to identify feeds and arc flash PPE requirements. Contractor to provide all materials and equipment to create a functioning system. Existing light switch, shall be relocated inside RM 158 adjacent to existing 3’ door on the wall that shares the office location to be approved by the COR. The N2 Exhaust hood requires a dedicated power source.

I.) Concrete - Transformer pad located on the outside of building 3291. Area for pad will need to have top soil removed, excavated to a depth that allows for 4” of compacted #53 aggregate, formed pad must be minimum of 24” larger than the transformer on all sides with a 36” space between the transformers, all edges must have a 45 degree bevel, top of transformer pad must be 3” above finished grade, minimum 6 Inch thickness 4000psi reinforced concrete. Reinforced with tied #4 bar maximum 8” centers in both directions held to the center of the placement with rebar chairs. Concrete shall receive a broom finish to edge of formwork. Include all applicable grounding and locate transformer per National Electric Code. Repair disturbed areas and establish grass. J) The Contractor shall clean the worksite at the end of each work day or more frequent as needed. The Contractor shall dispose of any scrap material and clean any spills that may occur.