This document provides guidance to system operators, owners, and engineers that are responsible for providing electrical service to loads that cause voltage fluctuations. It provides guidance on the principles and methodology that can be used to determine requirements for connecting fluctuating loads to both radial and network systems. Methods for determining appropriate flicker planning levels and emission limits for fluctuating loads as well as those that create rapid voltage changes are provided.This document provides background on the light flicker phenomenon that arises out of the fluctuations in power demands of variable loads. A flicker measurement method is presented using a meter that is completely described in IEC Standard 61000-4-15. The short-term (Pst) and long-term (Plt) flicker indices used for the analysis of flicker data are defined. Flicker limits for various voltage levels are presented. An assessment procedure for evaluating flicker compliance against emission limits is described. Methodologies to analyze background flicker to identify the flicker contribution of single loads are also presented. The document provides ways to estimate flicker levels at the PCC (Point of Common Coupling) depending on the type of the load. The document includes example terms and language that can be the basis for defining relative responsibilities and assessment methods for customer installations that may cause flicker issues.
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