9-Exhibit H_NFPA 110 EPSS Suggested Maintenance Schedule_04012026_BA.pdf
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This document is Exhibit H, a NFPA 110-2022 suggested maintenance schedule for Emergency Power Supply Systems (EPSS), including generators, automatic transfer switches (ATS), and maintenance transfer switches (MTS) at the Beltsville Agricultural Research Center (BARC), a USDA-ARS facility in Beltsville, Maryland.
The schedule provides detailed maintenance requirements across multiple system components organized into nine primary categories: Fuel System, Lubrication System, Cooling System, Exhaust System, Battery System, Electrical System, Prime Mover (Engine), Generator End, and Automatic Transfer Switch. For each component, the schedule specifies required actions (Visual Inspection, Check, Change, Clean, and Test) with frequencies designated as Weekly (W), Monthly (M), Quarterly (Q), Semi-Annual (S), or Annually (A). Level 1 and Level 2 maintenance designations differentiate between basic and comprehensive service intervals. Notable maintenance requirements include weekly checks of fuel and oil levels, monthly oil changes or every 50 hours of operation, quarterly battery terminal cleaning, and annual antifreeze replacement. Critical engine-related tasks include air cleaner service every semi-annually, ignition system inspection annually, and load testing at minimum 30 percent nameplate rating every three years or four hours. The transfer switch requires weekly exercise under load and annual thermographic temperature scans. The schedule includes footnotes specifying that certain tasks occur every 5 years or 500 hours, or every 3 years or 500 hours, providing contractors with comprehensive guidance for EPSS preventive maintenance and compliance with NFPA 110 standards.
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BARC EPSS (Generator/ATS/MTS) Maintenance and Repair IDIQ Beltsville Agricultural Research Center (BARC) USDA-ARS, Beltsville, MD
Exhibit H NFPA 110 EPSS Suggested Maintenance Schedule
EPSS Maintenance Schedule Suggested Maintenance Schedule for Emergency Power Supply Systems (EPSSs) Source: NFPA 110-2022 Figure A.8.3.1(a)
W=Weekly S=Semi-Annual M=Monthly A=Annually
Visual Q=Quarterly #'s=hours Component (as applicable) Inspection Check Change Clean Test Level 1 Level 2
Fuel System Main supply tank level X W M Day tank level X X W M Day tank float switch X X W Q Supply or transfer pump operation X X W Q Solenoid valve operation X X W Q Strainer, filter and/or dirt leg X Q Q Water in system X X W Q Flexible hose and connectors X R W M Tank vents/overflow pipe blocked X X A A Piping X A A Wiring in fuel system X A A Fuel in main tank R A A
Lubrication System Oil level X X W M Oil change R 50 or A 50 or A Oil filter R 50 or A 50 or A Lube oil heater X W M Crankcase breather X R X Q S
Cooling System Coolant level X X W M Antifreeze protection level X S A Antifreeze R A A Adequate cooling water to heat exchanger X W M Rod out heat exchanger X A A Adequate fresh air through radiator X W M Clean exterior of radiator X A A Fan and alternator belts X X M Q Water pump X W Q Flexible water hoses and connections X X W M Jacket water heater X W M Inspect ductwork, clean louvers X X X A A Louver motor and controls X X X A A
Exhaust System Leakage X X W M Drain condensate trap X W M Insulation and fire hazards X Q Q Excessive back pressure X X A A Exhaust system hanger and supports X A A Flexible exhaust section X S S
Battery System Electrolyte level X W M Terminals clean and tight X X Q Q Remove corrosion from case X X M M Specific gravity or state of charge X M M Charger and charge rate X M M Equalize charge X M M
(X=Action; R=Replace, if needed)
Source: NFPA 110-2022 Figure A.8.3.1(a)
W=Weekly S=Semi-Annual M=Monthly A=Annually
Visual Q=Quarterly #'s=hours Component (as applicable) Inspection Check Change Clean Test Level 1 Level 2
Electrical System General inspection X W M Tighten control and power wiring connections X A A Wire chafing if subject to movement X X Q S Operation of safeties and alarms X S S Boxes, panels and cabinets X S S Circuit breakers, fuses X X R X X M A Transfer switch main contacts X X A A Calibration of voltage-sensing relays/devices X X A A Wire insulation breakdown X 5/500a 3/500b
Prime Mover (Engine) General inspection X W M Service air cleaner R X S S Governor oil level and linkage X X M M Governor oil R A A Ignition system - plugs, cap, rotor, secondary wire insulation X X R X X A A Choke setting and carburetor adjustment X S S Injector pump and injectors for flow rate, pressure, and/or spray pattern X A A Load test at minimum of 30% nameplate rating X 3/4c 3/4c
Valve clearance X 3/500b 3/500b
Torque bolts X 3/500b 3/500b
Generator End Brush length, appearance free to move in holder X X X S S Commutator and slip rings X X A A Rotor and stator X X A A Bearings X R A A Bearing grease X R A A Exciter X X X A A Voltage regulator X X X A A Measure and record resistance readings of windings with insulation tester (Megger) X A A
General Condition Unusual noises, vibrations, leakage, temperatures or deterioration X X W M Service room/surrounding area X X W M Restore system to automatic operation condition X W M a Every 5 years or 500 hours b Every 3 years or 500 hours c Every 3 years for 4 hours
Source: NFPA 110-2022 Figure A.8.3.1(a)
W=Weekly S=Semi-Annual M=Monthly A=Annually
Visual Q=Quarterly #'s=hours Component (as applicable) Inspection Check Change Clean Test Level 1 Level 2
Automatic Transfer Switch General inspection X W M Exercise the system under load X W M Automatic control system X M Q Cabinet exterior X X M Q Tighten external components X X M Q External operating mechanism X X Q A Inspect interior of transfer switch X Q A Tighten internal components X X A A LED indicators and remote control systems operation X A A Transfer switch main contacts X R X A A Tighten wiring connections X A A Thermographic temperature scan X A A Wire insulation deterioration X A A
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