IEEE Std 1584b-2011 pdf download – IEEE Guide for Performing Arc-Flash Hazard Calculations Amendment 2: Changes to Clause 4.
4.2 Step 1: Collect the system and installation data The largest effort in an arc-flash hazard study is collecting the field data. Even for a plant with nominally up-to-date single-line diagrams, time-current curves, and short-circuit study on a computer, the field part of the study will take about half of the effort. Even for new facilities, field verification of the one-line diagrams and protection setting are necessary to verify the integrity of the power system. Regular site employees who are familiar with the site and its safety practices may be able to do this part of the job best. While the data required for this study is similar to data collected for typical short-circuit and protective- device coordination studies, it goes further in that all low-voltage distribution and control equipment plus its feeders and large branch circuits must be included. Annex A contains a sample form for most of the equipment and system data needed to perform the electrical system studies. Similar forms may be prepared in advance for all electrical equipment before starting a study. Begin by reviewing the single-line diagrams and electrical equipment site and layout arrangement with people who are familiar with the site. The diagrams may have to be updated to show the current system configuration and orientation before the arc-flash study can begin. The single-line diagrams must include all alternate feeds. If single-line diagrams are not available, create them. It is very important for electrical safety to have up-to-date single-line diagrams available. Refer to IEEE Std 315-1975 and IEEE Std 315A-1986 plus IEEE Std C37.2-20081996 for examples.
For transformers, generators, large motors, and switchgear, note collect all the nameplate data. Typically this would include voltage/voltage ranges or tap settings, ampacity, kilowatt or kilovolt amperes, momentary or interrupting current rating, impedance or transient/subtransient reactance data, etc. Next, collect note conductor and cable data along with its installation (routing and support method, in magnetic raceway—steel conduit or nonmagnetic raceway—aluminum tray, etc.) for all electrical circuits between the utility power source and the distribution and control equipment. Typical data might be: 300 m (1000 ft) of 3 single conductor 500 kcmil copper in overhead magnetic duct; 500 600 m (2000 ft) of 6 single conductor 4/0 AWG copper in underground nonmagnetic duct; 100 150 m (500 ft) of 3/C 3 single conductor 250 kcmil aluminum in overhead cable tray; or 1000 1200 m (4000 ft) pole line with 3 single conductor 4 AWG hard drawn copper conductors in a delta configuration with 500 mm (20 in) spacing. This information is needed for calculation of impedances. Typical sources of cable/conductor impedance data are available in software package libraries, and tables located in IEEE Std 141-1993551-2006. See Annex A for a sample data collection form for cables.