November 2020 - M&V Focus Issue # 7

In this issue of M&V Focus, Anna Kelly and Craig Sinnamon propose a paper that analyzes daily and hourly energy efficiency projects using IPMVP Option C methods. They demonstrate that models can identify savings as low as 3 % of facility consumption. Colin Grenville takes us through another exciting case studies where a client decided to install solar PV on its property after an ESCO commissioned other ECMs, and without consideration of the ongoing M&V activity. Saghi Salehi and Maryam Rezaie present a case study of natural gas consumption in a complex of administrative buildings with a single supplier meter to measure the energy consumption of 5 separate facilities and a restaurant. They discuss measurements of uncertainties and statistical errors. Matheus Lage discusses M & V in public lighting in Brazil, focusing on comparing the methodologies used by the Energy Efficiency Program of the National Electric Energy Agency and by Eletrobras. Phil Combs presents the outcome of a recent update of the ANSI C-137.5 standard that provides specifications regarding energy measurement from lighting systems and devices. This standard addresses M&V considerations such as uncertainty, error, precision, and calibration. Finally, Paul Calberg-Ellen and Nathan Lee present French translations of eight articles published in M&V Focus in 2018 and 2019.


us By Phil Combs*, CEM, CMVP

The forthcoming ANSI C137.5 standard will provide specifications regarding energy measurement from lighting systems and devices. This represents a significant opportunity for the EVO and IPMVP community to add more value to lighting retrofit verification while also reducing uncertainty and minimizing time and cost.

ANSI C137 is the lighting systems committee sponsored by the National Electrical Manufacturers Association (NEMA), which develops standards and specifications for indoor and outdoor lighting systems installed in an application with consideration of human health and comfort, personal security, the physical environment, energy consumption, and daylight integration. Such lighting systems includes components (e.g., luminaires, sensors/controllers, windows or skylights) and associated software designed to minimize energy use while maintaining lighting quality, and that may be interconnected to provide control, monitoring functions, and interface with related systems.
ANSI provides a neutral setting for stakeholders to develop standards.

The C137 lighting systems committee is an industry committee that has wide-ranging stakeholders and representative organizations as summarized in the illustration below

These groups consist mainly of representatives from the lighting industry, utilities, and government agencies such as national labs.

 ANSI Figure 1


There are several working committees under the C137 standards group:

C137.0 – Lighting System Definitions
C137.1 – 0-10V Dimming Interface for LED Drivers, Fluorescent Ballasts, and Controls for Lighting Systems
C137.2 – Cybersecurity Requirements for Lighting Systems
C137.3 – Minimum Requirements for installation of Energy Efficient Power over Ethernet (PoE) Lighting Systems
C137.4 – Lighting System Digital Interface with Auxiliary Power
C137.5 – Lighting System Energy Reporting
C137.6 – Information Model and Data Tagging
C137,7 – Parking Lot Lighting
C137.8 – Lighting System User Interfaces

EVO was invited to join the committee in 2018 as a mean to see if some of the clarification updates under consideration would adhere to the widely recognized IPMVP principles – a strategy meant to build on the existing acceptance of the IPMVP and streamline market adoption.

Of these committees, ANSI C137.5 – Lighting System Energy Reporting, provides much potential opportunity for lighting energy conservation measure (ECM) verification.
For example, consider a traditional lighting retrofit ECM. Pre-retrofit and Post-retrofit lighting sampling of wattage and/or hours is chosen (Option A) to manage the cost of M&V. The M&V activity is traditionally a manual, one-time measurement of one of the key parameters. Although pre-retrofit activities would likely stay the same, for post-retrofit there is the ability to continuously and remotely measure all key parameters (Option B). This change in approach can simultaneously reduce cost and uncertainty, while adding more value to stakeholders.

The standard is very detailed in terms of scope and requirements, and adequately addresses M&V considerations such as uncertainty, error, precision, calibration, data requirements, and scope definitions in terms of which components included and excluded from energy measurement. The consensus objective it to ensure that measurement and reporting of energy usage in lighting systems would be contained within a 10% measurement uncertainty at a confidence level of 90%. This applies to both energy reporting devices (ERD) or ERD aggregators (ERDA).

The standard has no specific normative references but lists EVO 10000-1 IPMVP Core Concepts and EVO 10100-1 Uncertainty Assessment for IPMVP as two informative references.. The standard is currently under formal review and expected to be released in the Fall of 2020.



ANSI C137 Lighting Systems, August 2017
Michael S. O’Boyle, LC – Technical Policy Manager - Signify

American Lighting Association (ALA)
Proposed American National Standard For Lighting Systems Digital Interface with Auxiliary Power, Jan 1, 2019
Michael S. O’Boyle, LC – Technical Policy Manager - Signify

Digital Illumination Interface Alliance (DiiA)

 evo globe 25x25

(*) Phil Combs, CEM, CMVP, is a Measurement and Verification Engineer for Trane Technologies, and a member of EVO's IPMVP Committee and ANSI C137.5 subcommittee.