Critical Power: NFPA 110: Standard for Emergency and Standby Power Systems

In the Consulting-Specifying Engineer's May 8 webcast, Tom Divine, PE, Smith Seckman Reid Inc., and Kenneth Kutsmeda, PE, LEED, AP, Jacobs Engineering, discussed how consulting engineers who specify emergency power equipment for mission critical facilities will be impacted by new code requirements.

05/12/2014


Consulting engineers who specify emergency power equipment understand that installations for mission critical facilities, such as hospitals and data centers, are required to comply with NFPA 110: Standard for Emergency and Standby Power Systems, in conjunction with NFPA 70: National Electrical Code. System designers must interpret the requirements of NFPA 110, ensure their designs follow them, and educate their clients about how the standard affects their operations.

NFPA 110 provides performance requirements for emergency and standby power systems that supply reliable auxiliary power to critical and essential loads when the primary power source fails. The standard covers installation, maintenance, operation, and testing requirements as they pertain to the performance of the emergency power supply system (EPSS) including power sources, transfer equipment, controls, supervisory equipment, and all related electrical and mechanical auxiliary and accessory equipment.

The significant changes from the 2010 edition of NFPA 110 inlcude:

  • The scope: the code covers location, maintenance, testing, system characteristics, and the scope ends at load terminals of transfer switches.
  • Key abbreviations: Emergency power supply (EPS) and Emergency power supply system (EPSS)
  • Inspection and testing: Installation testing (EPSS), weekly inspections (EPSS), monthly load testing (EPSS), and testing transfer switches operated monthly are all required.
  • Code changes:
    • 6.1.6: Permits electrically interlocked circuit breakers as transfer switch for medium-voltage mechanical equipment
    • 8.1.2: Requires consideration of portable generator when type criteria can't be met.
    • 8.4.8: Requires that only “qualified persons” perform maintenance, changes from “a properly instructed individual”
  • NFPA 110: Standard for Emergency and Standby Power Systems: Defines how emergency and standby power systems are to be installed and tested. It contains requirements for energy sources, transfer equipment, and installation and environmental considerations. The NFPA 110 divides emergency power systems into three categories: Type, class, and level.

The type refers to the maximum time that an emergency power system can remain unpowered after a failure or the normal source.

 

The class of an emergency power system refers to the minimum time, in hours, for which the system is designed to operate at its rated load without being refueled or recharged.

 

The level of an emergency power system refers to the level of equipment installation, performance, and maintenance requirements.

            Level 1: When failure of the equipment to perform could result in loss of
          human life or serious injuries

            Level 2: When failure of the equipment to perform is less critical to human
          life and safety and where the authority having jurisdiction shall permit a
          higher degree of flexibility than that provided by a level 1 system.

Testing Requirements:

  • Installation testing:
  • Start system and record performance
  • Full load test: 2 hr.
  • Engine crank and battery tests
  • Detailed records
  • Monthly load testing:
    • Requirement covers entire EPSS
    • Run generator under load
    • Exercise transfer switches
    • Diesel generators have a 30 min. minimum
    • Recommended exhaust temperature, or 30% of nameplate kW rating
    • Otherwise, annual test with supplemental load, for 30 minutes at 50%, 1 hr at 75%
    • Level 1: 100% test for lesser of class duration or 4 hr, every 3 years, at 30% and at recommended exhaust temperature

Testing strategies:

  • Transfer less sensitive load, if adequate
  • Manage mechanical systems to increase load for test
  • Complete normal power system shutdown
  • Load bank: Start with facility load, supplement with load bank


No comments
The Top Plant program honors outstanding manufacturing facilities in North America. View the 2013 Top Plant.
The Product of the Year program recognizes products newly released in the manufacturing industries.
The Engineering Leaders Under 40 program identifies and gives recognition to young engineers who...
The true cost of lubrication: Three keys to consider when evaluating oils; Plant Engineering Lubrication Guide; 11 ways to protect bearing assets; Is lubrication part of your KPIs?
Contract maintenance: 5 ways to keep things humming while keeping an eye on costs; Pneumatic systems; Energy monitoring; The sixth 'S' is safety
Transport your data: Supply chain information critical to operational excellence; High-voltage faults; Portable cooling; Safety automation isn't automatic
Case Study Database

Case Study Database

Get more exposure for your case study by uploading it to the Plant Engineering case study database, where end-users can identify relevant solutions and explore what the experts are doing to effectively implement a variety of technology and productivity related projects.

These case studies provide examples of how knowledgeable solution providers have used technology, processes and people to create effective and successful implementations in real-world situations. Case studies can be completed by filling out a simple online form where you can outline the project title, abstract, and full story in 1500 words or less; upload photos, videos and a logo.

Click here to visit the Case Study Database and upload your case study.

Maintaining low data center PUE; Using eco mode in UPS systems; Commissioning electrical and power systems; Exploring dc power distribution alternatives
Synchronizing industrial Ethernet networks; Selecting protocol conversion gateways; Integrating HMIs with PLCs and PACs
Why manufacturers need to see energy in a different light: Current approaches to energy management yield quick savings, but leave plant managers searching for ways of improving on those early gains.

Annual Salary Survey

Participate in the 2013 Salary Survey

In a year when manufacturing continued to lead the economic rebound, it makes sense that plant manager bonuses rebounded. Plant Engineering’s annual Salary Survey shows both wages and bonuses rose in 2012 after a retreat the year before.

Average salary across all job titles for plant floor management rose 3.5% to $95,446, and bonus compensation jumped to $15,162, a 4.2% increase from the 2010 level and double the 2011 total, which showed a sharp drop in bonus.

2012 Salary Survey Analysis

2012 Salary Survey Results

Maintenance and reliability tips and best practices from the maintenance and reliability coaches at Allied Reliability Group.
The One Voice for Manufacturing blog reports on federal public policy issues impacting the manufacturing sector. One Voice is a joint effort by the National Tooling and Machining...
The Society for Maintenance and Reliability Professionals an organization devoted...
Join this ongoing discussion of machine guarding topics, including solutions assessments, regulatory compliance, gap analysis...
IMS Research, recently acquired by IHS Inc., is a leading independent supplier of market research and consultancy to the global electronics industry.
Maintenance is not optional in manufacturing. It’s a profit center, driving productivity and uptime while reducing overall repair costs.
The Lachance on CMMS blog is about current maintenance topics. Blogger Paul Lachance is president and chief technology officer for Smartware Group.