1584-2002 standard consistent with the methods defined in NFPA 70E-2017. The changes included in this project require an arc flash update because the NAME SPECIFIC CHANGES HERE invalidates old arc flash information or require arc flash information to be generated for new equipment. The following report includes a clarification of the information used during calculations; a presentation of recommendations generated from the results of the study; arc flash results, short circuit results, and coordination results; and supplementary appendices providing additional information about the studies. Any changes to the electrical system of the facility may affect the arc flash ratings of the electrical equipment and invalidate the results of this study. For this reason, it is recommended that the arc flash for the entire facility be re-evaluated on a regular basis not exceeding five years to account for such changes (as specified by NFPA 70E). -> INCLUDE IF SC AND COORD NOT GIVEN This report does not include short circuit or coordination studies because THEY WERE DONE PREVIOUSLY IN ANOTHER REPORT. The results given assume that the settings and equipment ratings given in these previous reports remain valid.
Clarifications Information Received and Collected
The information used for this arc flash study was collected during an on-site audit performed on DATES and included information like wire length, size, and type; breaker information and settings; enclosure ratings; and transformer information. Additional information was also taken from EQUIPMENT ORDERS AND EXISTING ONE- LINES to supplement the data collected during the site walk-through. Short circuit availability at the service transformers was given to Interstates by UTILITY REP [phone: (XXX) XXX-XXXX; email: XXXX@XXXXX.com] from POWER COMPANY on DATE. NOTE: the impedance should have an asterisk if assumed (for main xfmr); X/R should be included if given Service Name 3P Availability (A) L-G Availability (A) Transformer Size (kVA) Transformer Impedance (%) X/R Ratio Assumptions The following assumptions were made when performing the arc flash hazard analysis for the COMPANY NAME AND LOCATION facility: 1. Utility Contribution a. There was no available fault contri bution from the utility so an “infinite bus” assump tion was used. Specifically, 300 MVA was used on the primary of the utility transformer. Scenarios will be run at 100%, and 50% of the maximum let-through of the transformer with the worst case scenario for arc flash hazard. 2. Transformer Tap a. Due to software limitations, a tap of -2.5 was used on the primary side of the service transformer(s). This was used to ensure a more accurate result of the load flow and voltage drop calculations. 3. Short Circuit Ratings of Unlisted Enclosures
a. Disconnects and panels without markings indicating short circuit ratings were estimated to have a short circuit rating appropriate for the style of gear indicated. If no rating could be determined, 10 kASCR or the lowest rated breaker in a panel was assumed to be the kASCR.
SITE NAME ARC FLASH STUDY
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INTERSTATES DATE
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