Frederick Community College Facilities Master Plan Chapter 5 The College Today 5-C-5 May, 2023 • MDP-1: 1200 amp serving Chiller 3 • MDP-2: 400 amp serving Panel PP-PE • MDP-3: 400 amp – not labeled (believe it serves MCC-PP-PC) • MDP-4: 800 amp serving Switchboard MDP-A Sections 1 and 2 • MDP-5: 800 amp serving Chiller 1 A 600 amp, three pole fusible switch is mounted adjacent to the switchboard on C-channel supports. The line side feeder serving this switch is tapped off Switchboard MDP’s main bus. This switch is designated as MDP-6 which is the 6th service disconnect and is serving Chiller 2. The highest peak demand load for the past two years was 754 kW which occurred in the month of September in 2018. Based on a 90% power factor, this equates to 838 kVA or 1,008 amps at 480/277 volts, three phase, four wire. This is well within the capacity of the main switchboard which is rated 3000 amps at 480/277 volts, three phase, four wire. Switchboard MDP-A Sections 1 and 2 are located within the main electric room and appears to be the original switchboard serving the building. This switchboard was manufactured by Cutler Hammer Type QUB and is rated 1200 amps, 480/277 volts, three phase, four wire. This switchboard also utilizes fusible switches for the distribution feeders and contains the following: • 200 amp serving Panel HB • 200 amp serving Panel HA • 600 amp serving Motor Control Center MCC-PA • 30 amp spare • 30 amp serving hazardous storage heaters • 60 amp serving Panel LP-PA transformer • 60 amp serving site lighting • 100 amp serving Panel SE • 100 amp serving Panel PP-PB transformer • 400 amp serving Panel HHA The main electric room houses three branch circuit panels designated PP-PD, PP-PE and SE. The feeder for Panel PP-PD is tapped off the main bus in Switchboard MDP-A and utilizes a fusible switch mounted adjacent to the switchboard as the main disconnecting means. Panel PP-PD is rated 225 amp, 480/277 volts, three phase, four wire and was manufactured by Westinghouse Type PRL2. This panel contains the feeder breakers serving cooling tower 1 fans, sump heaters and heat trace. The pneumatic controls air compressor is also indicated as being served from this panel. Panel PP-PE was manufactured by General Electric A series and is rated 400 amps, 480/277 volts, three phase, four wire. This panel serves cooling tower 2 fans and heat trace. In addition, several of the condenser and chiller water pumps, and heat reclamation pumps are also indicated as being served from this panel. Panel SE serves site lighting and is rated 100 amps, 480/277 volts, three phase, four wire. This panel was manufactured by Square D Type NF and provides service to five lighting contactors mounted adjacent to the panel. The contactors are designated CL-19 thru CL-21 and CL-24 and manufactured by Square D. These contactors control all parking lot and roadway lighting in the vicinity of the building. Motor Control Centers MCC-PA and MCC-PP-PC are both located in the main mechanical room of the central plant. Motor Control Center MCCPA is rated 600 amp main lug only, 480/277 volts, three phase, four wire and was manufactured by Square D Model 6. Motor Control Center MCC-PP-PC is also rated 600 amps main lug only and was manufactured by Westinghouse Series 2100. This control center was installed in 1994 which was concurrent with the installation of Switchboard MDP. Both motor control centers contain combination starters and feeder units which serve chiller, condenser, and heating water pumps. There are also two air compressors being served from MCC-PA.
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