Common use of Arc Flash Study Clause in Contracts

Arc Flash Study. Upon completion of the ETAP or SKM model, the maximum three-phase symmetrical and half- cycle fault currents will be calculated for each city building or facility. The maximum fault current will be used to verify interrupting ratings at all devices. The arc currents will be estimated based on the three-phase, half-cycle fault currents, which will consider arcing resistance for typical fault conditions. The arc currents will then be used to determine the clearing times associated with each studied protective device at the each of the relevant equipment lineup. The clearing times and the arc fault current will be used to calculate arc flash incident energy. Consultant will use the three-phase symmetrical fault current (Per the IEEE 1584 standard) at each protective device to determine the clearing time. The clearing time is a key item in arc flash calculation and, in many cases, can be the most significant factor contributing to the arc flash hazard. DocuSign Envelope ID: 212B9288-4BBD-4BD3-9726-AB81FEAE5092 DocuSign Envelope ID: 137D525A-782B-41F0-9A72-DBDA41906F52 At each studied protective device location, the ETAP or SKM model will be used to determine the incident energy level associated with an arc flash. The arc flash calculations will be done in accordance with IEEE 1584-2018 (Guide for Performing Arc Flash Hazard Calculations) and NFPA 70E – 2021 and will determine the flash protection boundary distance and the required PPE for working on energized equipment.

Arc Flash Study. Upon completion of the ETAP or SKM model, the maximum three-phase symmetrical and half- cycle fault currents will be calculated for each city building or facility. The maximum fault current will be used to verify interrupting ratings at all devices. The arc currents will be estimated based on the three-phase, half-cycle fault currents, which will consider arcing resistance for typical fault conditions. The arc currents will then be used to determine the clearing times associated with each studied protective device at the each of the relevant equipment lineup. The clearing times and the arc fault current will be used to calculate arc flash incident energy. Consultant will use the three-phase symmetrical fault current (Per the IEEE 1584 standard) at each protective device to determine the clearing time. The clearing time is a key item in arc flash calculation and, in many cases, can be the most significant factor contributing to the arc flash hazard. DocuSign Envelope ID: 212B9288-4BBD-4BD3-9726-AB81FEAE5092 DocuSign Envelope ID: 137D525A-782B-41F0-9A72-DBDA41906F52 At each studied protective device location, the ETAP or SKM model will be used to determine the incident energy level associated with an arc flash. The arc flash calculations will be done in accordance with IEEE 1584-2018 (Guide for Performing Arc Flash Hazard Calculations) and NFPA 70E – 2021 and will determine the flash protection boundary distance and the required PPE for working on energized equipment.