1. © 2015 Eaton Corporation. All rights reserved. Series Ratings Suher Al Hashimi March 2015

2. 2 2 © 2015 Eaton Corporation. All rights reserved. Overview  Types of Systems  Series Ratings and IER background information  Series Ratings and IER applications  Worked Example

3. 3 3 © 2015 Eaton Corporation. All rights reserved. Types of Systems  Selectively Coordinated Systems  Fully Rated Systems  Series Rated Systems

4. 4 4 © 2015 Eaton Corporation. All rights reserved. Selectively Coordinated systems n Breaker A - IC equal or greater to available fault level n Breaker B - IC equal or greater to available fault level n … AND must maintain certain separation between TCC’s 150A Breaker A Breaker B SC - 18 KA 800AF

5. 5 5 © 2015 Eaton Corporation. All rights reserved. Fully Rated System Breaker A - IC equal or greater to available fault level Breaker B - IC equal or greater to available fault level SC - 18 KA 400A 100A

6. 6 6 © 2015 Eaton Corporation. All rights reserved. Series Rated System... must be tested successfully with breaker A in a CSA facility. How does series rating work? Breaker A - IC equal or greater to available fault level Breaker B - IC lower than system fault level... System SC - 18 KA 25KA 10KA Same manufacturer

7. 7 7 © 2015 Eaton Corporation. All rights reserved. Series Ratings - How does it work ? n Standard Contact n Current Limiting Contact (Pivoted Reverse Loop) n Blow apart contacts

8. 8 8 © 2015 Eaton Corporation. All rights reserved. Series Rating- Breaker to Breaker n Arc Chamber - arc drawn when contacts open. n Plasma arc - dynamic impedance increases with distance. n Current is limited by two arcs - system is self protecting. X t 1, Z=0 X t 2, Z > 0 t 3, z=  X Breaker A Contact Breaker B Contact 20KA How about a Fuse upstream?

9. 9 9 © 2015 Eaton Corporation. All rights reserved. 100 kA Available Fault Current 200A Fuse Let- Through Fault Current Available Current in RMS Symmetrical Amperes 17 kA100 kA Fuse let-through curves when with downstream passive devices. Current Limiting Threshold 200A Fuse Maximum Instantaneous Peak Let-Through Amperes Thousands Ten Thousands Hundred Thousands B I p = 2.3 x I RMS SYM 1 5 105 10 1 5 10 5 5 Series Ratings - Fuse and Breaker

10. 10 © 2015 Eaton Corporation. All rights reserved. Series Ratings - Fuse and Breaker Stand alone current limiting fuse. Fuse is current limiting and clears the fault in the first 1/4 cycle. Current limiting fuse with modern fast acting circuit breakers. Breaker begins to open. Breaker tries to clear the fault. Dynamic impedance is introduced. Current limiting fuse becomes slow acting device. Fuse Action FAST SLOW Fuse Action FAST SLOW

11. 11 © 2015 Eaton Corporation. All rights reserved.  Up-Over-Down Method DOES NOT APPLY in lieu of series ratings - when downstream CB are used.  CEC 14-014 – only if it “…is a recognized component of a series rated combination..”  Testing uses umbrella fuses – as there are different manufacturers – using the slower acting fuses.  Eaton – under review with CSA possibilities for testing much faster fuses, quick acting Eaton Busman fuses. Fuse Action FAST SLOW Series Ratings - Fuse and Breaker

12. 12 © 2015 Eaton Corporation. All rights reserved. Series Rating - test procedures Moulded Case Breakers – design and test to CSA spec C22.2 No. 5 and UL489  Series ratings tests:  Two short circuit shots at max. KA rating  Breakers are in their smallest enclosures  Both devices closed: Open, and  Closing downstream Breaker on a fault: open-close  Verify integrity of downstream device:  Calibration tests - twice the rated current  Dielectric withstand test - hipot

13. 13 © 2015 Eaton Corporation. All rights reserved. Fully Rated vs. Series Rated, 35kA 600V KDC FDB FDC 10,000A 10,000 amp fault, exceeds same setting on both breakers Fully Rated Series Rated

14. 14 © 2015 Eaton Corporation. All rights reserved. Series Ratings - Applications  Fault Calculation - required at the upstream device  Series ratings A, B and A, C Breaker “A” Breaker “B” System Fault Level Breaker “C” KA required at this point Additional devices KA not necessary for Series Ratings at this point

15. 15 © 2015 Eaton Corporation. All rights reserved. Series Ratings – Additional Devices FULLY RATED breakers - upstream, downstream or in the middle of a series rated combination IC KA A = KA B = >18KA IC KA C< 18KA Breaker A Breaker B SC 18KA Breaker C EXACT SAME TYPE Branch breakers downstream Breaker B and Breaker C must be of the exactly same Type (ex. Both BAB when series rating from A-B) Or listed combination with more than 2 devices in series

16. 16 © 2015 Eaton Corporation. All rights reserved. Series ratings – Applications Motor Loads Breaker A (25KA) protects and series rates with Breaker B if Motor Loads (Sum of FLA) < 1% of IC Breaker B (KA) Solutions:  Increase Breaker B KA  Use fully rated Breaker A – 25KA Breaker B – 10KA System Available Fault 20KA M FLA 130A Breaker B – 14KA and Listed combination 1% of 10,000A A is 100A 1% of 14,000A A is 140A

17. 17 © 2015 Eaton Corporation. All rights reserved. IER - Integrated Equipment Ratings Breakers-in-Series applied to assembled products, Eaton specific: n Loadcentres n Panelboards n Retrofit panelboards n Meter centres n Switchboards n Reftrofit Switchboards n Motor Control Centres n etc.

18. 18 © 2015 Eaton Corporation. All rights reserved. IER - Upstream device Device A:  Integral main or remote.  Breaker or fuse. Device A Breaker B System Fault Level

19. 19 © 2015 Eaton Corporation. All rights reserved. IER - Series Ratings Labeling Requirements

20. 20 © 2015 Eaton Corporation. All rights reserved. IER - Series Rated Labels

21. 21 © 2015 Eaton Corporation. All rights reserved. Integrated Equipment Ratings - Tools  IER handbook - handy tool to select distribution circuit protection IER ratings - available only for TESTED combinations IER - Integrated Equipment Ratings

22. 22 © 2015 Eaton Corporation. All rights reserved. IER - Where to use  Where available fault level requires premium IC rating (i.e. premium price circuit breakers).  Residential and Light commercial, other applications  Larger breakers vs. smaller, Loadcentre vs. Panelboard, Panelboard vs. Switchboard,  Saving costs and space Min 20” wide 14.5” wide

23. 23 © 2015 Eaton Corporation. All rights reserved. IER - Where to use Meter Centres:  240VAC 1ph 3w  208Y/120VAC 3ph 4w  max upstream device 1200 A Loadcentres:  max upstream device 400A Panelboards:  PL1a, PL2a, PL3a,PL4  Most combinations – 400A, 600A, 800A – least combinations

24. 24 © 2015 Eaton Corporation. All rights reserved. IER – How Used  Acceptance - specifier to accept series ratings. If not specified, it is assumed acceptable per CEC 14-014.  Specifier – NOT required to determine IER selections.  Manufacturer – responsible for IER application.  Take off - manufacturer / distributor prepare bid based upon manufacturer’s IER data.  Submittals - manufacturer / distributor submits tech data details with IER application AND location.

25. 25 © 2015 Eaton Corporation. All rights reserved. IER - How Used  Manufacturer MUST provide the proper equipment markings per CSA.  Installation should be checked to ensure that correct breaker combinations have been used.

26. 26 © 2015 Eaton Corporation. All rights reserved. IER - Procedure 1.Determine System Available Fault level – at the upstream device. 2.Select Upstream Breaker with IC equal to or greater than available fault level. 3.Select downstream breaker - based on IER book.

27. 27 © 2015 Eaton Corporation. All rights reserved. IER - Application & Worked Example  System Operating Voltage : 600Y/347V  Fault Level Available: 40kA  Upstream Breaker: 400A  Downstream Breakers:  2 and 3 pole; 15-150A,  1 pole; 15-30A 400A 150A 3p 600/347V, 40KA 30A 1p M FLA 10A

28. 28 © 2015 Eaton Corporation. All rights reserved. IER - Application & Worked Example Step 1: Determine type of panelboard  600Y/347V, 40kA, Main Breaker 400A, Feeder Breakers 2p, 3p, 15-150A ; 1p, 15-30A  2 types of panelboards possible - PRL 2a or 3a  Branch breakers ratings greater than 100A - PRL 3a

29. 29 © 2015 Eaton Corporation. All rights reserved. IER - Application & Worked Example Step 2: Use IER chart corresponding to panelboard chosen  Select voltage level - 600/347V  Select Fault Level associated with voltage - 42kA, use the next highest if exact value not shown  Select Main or Upstream Breaker Amperage - 400A

30. 30 © 2015 Eaton Corporation. All rights reserved. IER - Application & Worked Example  Vertically down from Main or Upstream breaker amperage chosen and  Horizontally across from fault level chosen.  Where these two intersect, read required upstream breaker type, then downstream devices.  Upstream device - KDC3400 breaker  Downstream devices - FDB 14kA branch breakers

31. 31 © 2015 Eaton Corporation. All rights reserved. IER – Series ratings – new combinations Stay tuned, new combinations are tested based on market requirements. IER book is being updated regularly! Eaton’s working on Bussmann specific fuses with breakers in series. AND fuse-to-fuse combinations! Properly applied Series Ratings saves you space and money!

32. 32 © 2015 Eaton Corporation. All rights reserved.