Emergency Power Supply Systems (EPSSs), including all appurtenant components, shall be inspected weekly and exercised under load at least monthly.
Of the entire NFPA 110 standard “Operational Inspection and Testing” is the section that is the most often read, misquoted, misunderstood and misinterpreted, the result of lifting and quoting material from it out of context.
Taking this section in its entirety provides a clear and simple guideline for inspecting and testing the entire Emergency Power Supply System (EPSS). It is only when the AHJ uses a portion of this chapter, or adds their spin, that things get a little foggy. Additionally, the NFPA states that starting batteries, including electrolyte levels, shall be inspected at weekly intervals and shall be maintained in full compliance with the manufacturer’s specifications.
NFPA 110, 8.4.1* EPSSs, including all appurtenant components, shall be inspected weekly and exercised under load at least monthly.
NFPA 110, A.8.4.1 Weekly inspection does not require running of the EPS. Running unloaded generators as part of this weekly inspection can result in long-term problems such as wet stacking.
MGI’s Weekly Inspection Checklist is a generic list much like the one found in NFPA 110. The main difference between them is the additional ‘Parameters’ column where an EPS’s specific ‘benchmark data’ can be inserted. Recording this information is important––and a necessity––if technicians are expected to immediately pinpoint potential problems from readings obtained during a routine inspection.