A04_USGS_Tunison_Upper_Lab_Main_Dissconnect_-_Chiller_Electric_Panel_Connection_SOW.docx

Main Power Entrance Disconnect Switch Installation USGS Tunison Laboratory of Aquatic Science 3075 Gracie Rd., Cortland NY 13045 Electrical Connection of Water Chillers

1.0 Introduction and Background

Introduction: USGS, Great Lakes Science Center’s, Tunison Laboratory of Aquatic Science in Cortland NY needs a main power entrance disconnect switch installed and two 3-phase electric circuit connections made at the main panel.

Background: The USGS Tunison Laboratory of Aquatic Science has a power entrance to their upper lab that does not have a main disconnect switch which is preventing completion of an internal wiring project. There is a transformer outside the lab where the main power entrance runs through into the lab. A main disconnect needs to be installed between the transformer and the main panel inside the building. Once the main disconnect switch is functional, two 3-phase circuits need to be connected to the panel. Wiring for the circuits is already complete to the panel and the circuit breakers for the two circuits are at the facility and ready for installation.

A licensed electrician has already run wiring from the chillers and purchased the breakers to be used in the electrical panel. The circuits support two industrial water chillers that operate on 208/230 volt – 3-phase electrical power (208/230/3/60: 143 FLA || 178 MCA || 250 MOP).

2.0 Scope

The existing electrical panel (208V 3-phase) has capacity to hook up two large water chillers, however, the connection for two (2) dedicated circuits needs to be completed to the panel (i.e., connect chiller wiring to panel circuit breakers). The absence of the main disconnect switch is preventing completion of the chiller circuits.

USGS needs the services of a licensed electrician to purchase and install an 800 amp 3-phase main power disconnect switch between the transformer at the exterior of the building and the main panel at the interior of the building (the main panel adjacent to the entrance from the transformer). After the main disconnect switch is functional, USGS needs the licensed electrician to complete the panel installation of two 208/230 volt – 3-phase electrical power circuits and circuit breakers provided previously by a licensed electrician. The wiring for the circuits is already connected at the chiller end and ran through conduit to the electrical panel (see: Attachment1_Transformer_and_Panel_Photos).

The main power entrance to the transformer is 13,200 volts, the power from the transformer to the main panel is 277/120 volts. The power entrance runs from below the transformer underground and up through the building floor under the panel over a distance of about 20ft. Pictures of the transformer location adjacent to the building, and the main panel, circuits and breakers appear in: Attachment1_Transformer_and_Panel_Photos. Location of the main disconnect switch will be chosen by the electrician doing the work to be most efficient for the job and confirmed by the onsite USGS technical contact.

3.0 Applicable Documents

See Attachment1_Transformer_and_Panel_Photos

4.0 Technical Requirements

Main Switch installation and completion of two existing circuits:

· Installation of a 800 amp 3-phase main power disconnect switch.

· Completion of two 208/230 volt – 3-phase electrical power circuits by installing 2 circuit breakers provided by USGS (purchased by a licensed electrician) and connecting the existing circuit wiring to the breakers.

5.0 Deliverables

Major tasks include:

· Excavation of the exiting electrical entrance at the building exterior and tying in a new entrance with main disconnect switch.

· Completion of two 208/230 volt – 3-phase electrical power circuits by installing 2 circuit breakers provided by USGS (purchased by a licensed electrician) and connecting the existing circuit wiring to the breakers.

% for NOT meeting the AQL