Electrical Diagnostic Surveys
Protective Device Coordination Analysis
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EDS can provide Protective Device Coordination Analysis in accordance with IEEE std 242-2001; Recommended Practice for Protection and Coordination of Industrial and Commercial Power Systems (Buff Book), and in accordance IEEE std 399-1997; Recommended Practice for Industrial and Commercial Power Systems Analysis (Brown Book). Coordination time-current characteristic curves are prepared to determine the required settings/sizes of the protective devices to maximize selectivity and safety with Arc Flash Hazards in mind.

The coordination curves are prepared on log-log paper to illustrate adequate clearing times of devices. The curves depict actual protective devices installed, based upon Easypower's® device library of manufacture curves, in order to ensure proper coordination.


Curve sheets shall contain, but not be limited to the following:
  • Device Identification and associated settings/size
  • Current multiplier
  • Cable insulation damage curves
  • Single line for the portion of the system
  • Voltage at which curves are plotted
  • ANSI frequent fault damage curve
  • Transformer inrush point
  • Motor Starting Profiles (Where Applicable)
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Protective Device Coordination Analysis Services
6730 Roosevelt Ave. Suite 100. Middletown, OH 45005
Call Us: 888-502-3026