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Home My WebLink AboutAPPROVED BY W PRIDE, Amazon LVPM Scope SEAM - PermitAmazon LVPM Scope Amazon Equipment Included Main utility fed switchboards Arc Flash Mitigation Relay Installation of a SEL‐751 relay in a standalone enclosure to provide remote trip functionality of the main protective device (bolted pressure switch or breaker). Involves installation of standalone integrator and rogowski coils (CTs) for current monitoring, voltage references from the bus, and installation of fiber optic cables in each branch feeder section to monitor for light. An arc flash incident on the load side of the main will be indicated by inrush of fault current as read by the rogowski coils and the flash of light will be registered by the fiber to instantaneously shunt trip the main breaker/switch. Purpose is to reduce the incident energy on the load side of the main breaker for life safety purposes allowing personnel to work on the equipment safely. Resulting incident energy is often below 6 cal/cm^2. Wiring Detail Installation of the arc flash relay does not involve modification, removal, or addition of any existing power wiring in the switchboard. This project strictly modifies the control of the main breaker and provide power monitoring only. The added integrator and rogowski coils will wrap around the line side bus to provide current readings to the relay. A fuse block will be added in the switchboard to pickup voltage reference from the equipment bus. Close and/or Shunt coils will be added to the existing breaker (or switch) to enable remote control from the relay. Arc flash relay panel is mounted within 20’ of the main panel typically mounted on the wall adjacent to the equipment. One 1”C and 1‐1/2”C are utilized for wiring between arc flash relay and the switchboard, one for the wiring and one for the fibers. Arc Flash wiring schematic and pictures of standard install attached for reference. Switchboard Maintenance & Inspection Verify all bus bolts and breaker cable connections are torqued to specifications. Cleaning and removal of all dust, dirt, debris buildup within the enclosure that may have built up on the breakers, cables, or bus. Visual inspection of gear and cabling looking for any deficiencies or potential failures that need to be addressed. IR Windows Installation of IR windows on the line side of the main breaker to enable infrared scanning of bus or cable connections that are normally inaccessible due to the high incident energy rating. Up to 10 3” windows per switchboard. Breaker Testing Secondary breaker injection testing will be performed on all electronic trip breakers to verify functioning withing factory specifications. Electrical Contractor Responsibilities Permit Electrical contractor responsible for submitting to the local jurisdiction for all required permitting and scheduling of any onsite inspections required prior to re‐energizing of equipment. Permit should be submitted immediately upon issuance of PO. Onsite Prework Electrical contractor will be responsible for mounting of the arc flash relay and UPS enclosure per pictures provided or as determined in the site walk prior to the onsite outage. The relay enclosure should be mounted such that the total conduit length does not exceed ~20’ in total length. When possible the UPS enclosure should be floor mounted directly below the relay enclosure, however the relay enclosure can be mounted anywhere nearby and conduit routed between the relay enclosure and the UPS. Prework Material Requirements  Provide all needed materials, fittings, accessories, required to mount the relay panel and UPS enclosure. Be prepared for concrete walls, block walls, stud walls.  Unistrut as required  1” and 1‐1/2” conduit as outlined below all required fittings and bushings for connection to enclosures and switchboard Prework expected to take no more than 1 day of effort and be executed prior to the onsite outage date. Day Onsite Outage Provide one electrician for onsite support of the installation effort. Finalize connection of conduit to main switchboard. Also, assisting with torqueing of bus and breaker bolts, as well as cleaning of the equipment. General support of the SEAM onsite team as needed. Onsite Outage Requirements Provide 2500‐3000W 120V portable generator and extension cords for temporary power for lighting and testing equipment for the work effort. Arc Flash Relay Wiring & Schematic  Relay panel will be UL labeled and come prewired with #14 THHN for all required wiring terminations to the switchboard as shown in the schematic below.  UPS panel will be UL labeled and come prewired with #12 THHN for back up power for the relay enclosure.  Fiber optic cables are provided with the SEL relay for monitoring light within the enclosure and are provided with terminations on both ends for connection to the SEL relay and for quick installation in the switchboard sections downstream. One fiber optic cable per section downstream of the main breaker is typical.  Max conduit length should be ~20’. Switchboard Main Bkr 1”C ‐ 8#12 1”C ‐ 20#14 1 1/2”C – Fiber Relay Pnl UPS Pnl A2B CDFHEG468101214161813 57911131517VAVB VCIARIAIBRIBICRICZ09Z02Z01Z04Z03Z06Z05(IA)(IB)(IC)ISH IN- IN+CH3 (CØ)SH IN- IN+CH2 (BØ)SH IN- IN+CH1 (AØ)SH 24V 24V- +V+V+V-V-GNDLNOUT+CH3OUT-OUT+CH1OUT-OUT+CH2OUT-480V BUSBACN10AOUT103MAINBREAKERGNDGND1H21X22H12X1VAZ10VBZ11VCZ12NUPS (EXTERNAL MOUNT)LNINTEGRATOR 1A01SEL-751A02A07A09OUT301C01C02OUT101A03A04OUT302C03C04OUT102A05A06OUTPUTFAULTIN301C09C10IN102A11A12IN101A10SH IN- IN+CH3SH IN- IN+CH2SH IN- IN+CH1 (N)WHT BRN SHD SH 24V 24V- +V+V+V-V-GNDLNOUT+CH3OUT-OUT+CH1OUT-OUT+CH2OUT-JK20221921IARIAZ08Z07(IN)LNINTEGRATOR 2NEUTRALBONDING JUMPER1H12H23AABCGTB1-17 (GND)3A1X12X25A135246FU4FU1123456FU2H2H4H3H5X2X4X3X513241234480V1.5KVA20AFU312GNLGNLL2423UAARIN302C11C12TC52ASHUNT TRIPM252652ACLOSE COILTC52ASHUNT TRIPN2728CLOSE COILFU5CPTPTGTB1-17GTB1-18GTB1-20TB2-21 (GND)SHEET NUMBERISSUECREATED BY:DATE:CHECKED BY:PROJECT #:102030TENTHS OF INCHINCHES123SHEET SCALESARC FLASH RELAY PANELSEAM GROUPSCHEMATIC2.0206/04/2021JH5/13/21ZR97728512GENERAL NOTES:1. REFERENCE DRAWING 1.0 FOR INTERNAL WIRING DIAGRAM.2. REFERENCE DRAWING 1.1 FOR WIRE SCHEDULE. TB1-1 TB1-9 TB1-17 TB1-2 TB1-10 TB1-18HARNESS #5HARNESS #7HARNESS #6HARNESS #1HARNESS #8TSTSTSSTACK LIGHTBREAKER 2HARNESS #4BREAKER 1HARNESS #3TB1-9TB1-10TB1-10TB1-11TB1-11TB1-12TB1-13TB2-8TB2-5TB2-6TB2-7TB1-14TB2-11TB2-9TB2-10TB2-4TB1-3TB1-4TB2-3TB1-5TB1-6TB1-6TB1-7TB1-8TB1-3TB1-2TB1-2TB1-1TB2-16TB2-14TB2-15TB2-18 TB2-19TB2-21TB2-23TB1-16TB1-15TB2-17REMOTE TRIPHARNESS #2 INPUTTB1-19(GND)TB1-19(GND)SWITCHGEARARC FLASH PANELROGOWSKI COIL INTEGRATORROGOWSKI COIL INTEGRATORUPSSEL-751SCALE: NONESCHEMATICTEST SWITCH (TS)WHT BRN SHD WHT BRN SHD WHT BRN SHD FOR NEUTRAL INTEGRATOR OPTIONTB2-1TB2-213TB2-2TB2-1UPSALARMUAAR27ISSUEDESCRIPTIONDATEAPPBY0 06/02/2021ISSUED FOR CONSTRUCTIONAB1 06/03/2021 ICE CUBE RELAY ADDITIONAB2 06/04/2021REVISED TERMINALSABABTB2-20TB2-22 Arc Relay Standard Installation Example Red arrow indicates the relay box mounted on the wall adjacent to the main switchboard shown to the left. Conduits routed from relay enclosure over to the switchboard for the current and voltage wiring as well as the fibers for light sensing. Blue arrow indicates the UPS panel below the relay that provides 120V backup power to the relay enclosure.