The National Fire Protection Association (NFPA) implements several requirements for Emergency Power Supply System (EPSS). The association implements standards for automatic transfer switches and standby generators. The Standard for Emergency and Standby Power Systems (110) is used to assess acceptability of generator systems of projects.
"¨The 110 includes maintenance, construction, operational testing requirements and installation of emergency power supply system. The recent 110 defines that the emergency power system shall be consisted of engine-driven set, emergency power supply, all control and transfer switches. It also incorporates support and supervisory devices up to the inclusion of load terminals.
However, the 110 neither specifies nor requires distinctions for EPSS. The local authorities in their jurisdiction must be consulted to check the requirements for EPSS of 110 on any proposed project.
The association defines three areas used to differentiate EPSS. The Class, Type and Level classify the NFPA requirements for EPSS. The said specifications must be included in the quotes for right generator configuration. Otherwise, there will be delays in the bidding procedure.
• Class. It specifies the least number of hours for it to operate at its specified load without refueling. Thus, a Class 48 must run for at least 2 days. Classification of class must account for previous power shortage notes and fuel efficiency due to weather, environmental factors, geographical location and shortages. The class affects the size of the fuel tank and the tank size must match the Class needs.
• Type. It stipulates the maximum time the load terminals of transfer switch works without power. It is the maximum acceptable time from power interruption to power generation of the emergency power system. The 110 also created 2-letter symbols"”Type U requires an Uninterruptible Power Supply (UPS) whereas Type M is a manual run with no time specification.
• Level. It defines 2 levels for backup system. Level 1 is more rigid and is implemented during equipment failure. The failure of equipment in this category could lead to serious injuries or death. Level 2 applies to failure when damages are less serious.
Project Specification Standards
Specific information must be provided when a specific project is being accomplished for 110. The following must be included in the list to come up with proper quotes aside from equipment performance:
• Altitude of the project site
• Surrounding temperature where equipment is installed (outdoor or indoor)
• Class, level and type of EPSS
• Type of local fuel energy components and fuel supply
• Structural load quality specifications:
a.) Maintenance (load to full load condition)
b.) Voltage dip and permissible frequency.
Other Important Highlights
• The provider can quote compliant generators.
• For transfer switch equipment, the sales office or dealer can give quotes for standard units.
• Find the installation, testing requirements and maintenance for Levels 1 and 2 in Chapters 7-8 of 110.
Get informed with the existing rules of NFPA. Refer to their website for complete listings of requirements for EPSS. Visit them at www.nfpa.org for more information.
