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What Causes Surges/Transients? • Lightning • Switching any reactive load, either on or off Any Inductor (cust. motor) Internal disturbances Any Capacitor (utility) Utility operations • Math: v(t) = 3te -2t + 2t – 1 transient Copyright © 2009 Advanced Protection Technologies (800) 237-4567 22
Metal Oxide Varistor – MOV SPD Building Block • Varistor - variable resistor • Semiconductor; generally zinc oxide • Connects parallel to load (not series) • Thickness determines clamping voltage • Diameter determines current capacity MOV symbol Copyright © 2009 Advanced Protection Technologies (800) 237-4567 23
Page 1 and 2: Advanced Protection Technologies Pr
Page 3 and 4: Advanced Protection Technologies (A
Page 5 and 6: UL 1449 THIRD Edition Combines TVSS
Page 7 and 8: UL 1449-3 & 2008 NEC Art 285 Surge
Page 9 and 10: UL 1449-3 & 2008 NEC Art 285 • Ch
Page 11 and 12: UL 1449-3 Performance Test Format C
Page 13 and 14: 2008 NEC Art 285 Copyright © 2009
Page 15 and 16: Simplifying Suggestions: (Why? on n
Page 17 and 18: Suggestions & Why (3 of 3): • Sel
Page 19 and 20: APT Here to Help: (800) 237-4567
Page 21: What Is a Surge/Transient? • High
Page 25 and 26: SPD Connector Leads • Need short
Page 27 and 28: SPD Terminology • Surge Current -
Page 29 and 30: MOV/SPD Failures • MOVs are Varia
Page 31 and 32: UL 1449 Performance Rating: • Pre
Page 33 and 34: 2008 NEC - Key Points SCCR labeling
Page 35 and 36: Grounding/Bonding TVSS/SPDs • Bet

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