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Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and Rapid Shutdown Requirements

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Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and Rapid Shutdown Requirements
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Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and Rapid Shutdown Requirements
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Page 1: Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and Rapid Shutdown Requirements

www.solectria.com!

Built for the real world! Solectria Renewables / Company Confidential © 2014!

Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and

Rapid Shutdown Requirements  

Page 2: Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and Rapid Shutdown Requirements

www.solectria.com!

Built for the real world! Solectria Renewables / Company Confidential © 2014!

q  This  webinar  will  be  available  a.erwards  at  www.solarpowerworldonline.com  &  email  

q Q&A  at  the  end  of  the  presenta:on    q  Hashtag  for  this  webinar:  #SolarWebinar    

Before we start..

Page 3: Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and Rapid Shutdown Requirements

www.solectria.com!

Built for the real world! Solectria Renewables / Company Confidential © 2014!

Kathie Zipp Solar Power World

Moderator Presenter

Claude Colp Solectria Renewables

Page 4: Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and Rapid Shutdown Requirements

www.solectria.com!

Built for the real world! Solectria Renewables / Company Confidential © 2014!

Presenta)on  Outline  

•  Solectria  Company  Overview  •  NEC  2008-­‐2014  •  Rapid  Shutdown  •  Arc  Fault  Detec:on  

Page 5: Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and Rapid Shutdown Requirements

www.solectria.com!

Built for the real world! Solectria Renewables / Company Confidential © 2014!

Solectria  Renewables  Company  Overview  

Page 6: Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and Rapid Shutdown Requirements

www.solectria.com!

Built for the real world! Solectria Renewables / Company Confidential © 2014!

Solectria  History  

1989! 2007! 2008!2005! 2009!2006! 2010! 2011! 2012!

Original 10kW UL Listed!

Solectria Corporation!

Founded!

Solectria divests vehicle products to Azure Dynamics!

60/82/95KW UL Listed!

SolrenView Web Monitoring Introduced!

Capacity Expansion to 200MW!

PVI 60/77/90KW!UL Listed!

PVI 13-15KW UL Listed!

PVI 3000-5300 Introduced!

MSS Introduced!

Capacity Expansion to 800MW!

Disconnecting String Combiners Introduced!

SGI 500XT transformerless 600V DC inverter introduced!

2013!

PVI 14-28TL, 3-phase transformerless inverters!

2014!

PVI 3800-7600TL, 1Ph transformerless

inverters!Introduced SGI 500 Premium Efficiency model with 97.5% CEC efficiency – highest in the industry!

Capacity Expansion to 350MW!

Introduced the SGI 500XTM & SGI 750XTM External Transformer!

Introduced PVI 50/60/75/85/100KW!& Premium Efficiency Models!

•  1989 – Solectria Corporation founded!•  2005 – Solectria Corp. EV division sold to Azure

!Dynamics!•  2005 – Solectria Renewables founded!•  2014 – Solectria became wholly owned!

!subsidiary of Yaskawa Electric!

Solectria Renewables !

Founded!

SGI Series UL Listed!

New SolrenView GUI Introduced!

Yaskawa Electric Acquires Solectria Renewables as wholly owned subsidiary!

ARCCOM (AFDI String Combiner) Introduction!

Page 7: Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and Rapid Shutdown Requirements

www.solectria.com!

Built for the real world! Solectria Renewables / Company Confidential © 2014!

Yaskawa  and  Solectria  

Yaskawa  Electric  Corp:  •  $3.6  billion  Japanese  firm  focused  on  motor  drives,  automa:on  controls  and  other  electrical  components  •  Company  founded  in  1915  •  5th  largest  Japanese  inverter  supplier,  but  no  U.S.  presence  •  Global  leader  in  quality    •  Manufacturing  loca:ons  in  strategic  PV  markets  •  Track  record  for  technological  advancement  and  leadership  

Page 8: Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and Rapid Shutdown Requirements

www.solectria.com!

Built for the real world! Solectria Renewables / Company Confidential © 2014!

Yaskawa  and  Solectria  

So  what  does  this  mean  for  our  customers?    ü  Immediately  enhanced  bankability    ü  Warranty  backing  by  bigger  company  ü  Solectria  is  100%  wholly  owned  subsidiary    ü  Same  team  in  place  as  before  (sales,  marke:ng,  customer  

services,  execu:ves)  ü  Same  manufacturing  loca:ons  and  product  offerings  ü  Poten:al  for  new  market  entry  in  the  future  ü  Access  to  world  class  quality  systems  

Page 9: Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and Rapid Shutdown Requirements

www.solectria.com!

Built for the real world! Solectria Renewables / Company Confidential © 2014!

North  American  Presence  •  Na:onwide  service  loca:ons  to  support    

o  Commissioning  o  Rapid  response  :mes    

•  Na:onwide  Sales  offices  •  Strategies  in  place  to  expand  into  South/Central  America  

Solectria  Office/Sales/Service  

Service  Solectria  Sales  

Page 10: Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and Rapid Shutdown Requirements

www.solectria.com!

Built for the real world! Solectria Renewables / Company Confidential © 2014!

… Even More Solutions from the Industry’s ! Best Inverter Lineup!

PV Inverters!Utility ! ! !External Transformer Inverters ! !500-750 kW !

! !Megawatt Solar Stations ! !1-2MW!

Commercial !Central Inverters, ! ! !50-100, 225-500 kW!! ! !3-Phase String ! ! !14-28 kW!

Residential !String Inverters ! ! !3.8-7.6 kW!

! ! String Combiners ! Web-Based Monitoring!

PVI 3800-7600TL PVI 14-20TL PVI 23-28TL PVI 50-100KW

SGI 225-500PE SGI 500XT SGI 500XTM SGI 750XTM

Page 11: Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and Rapid Shutdown Requirements

www.solectria.com!

Built for the real world! Solectria Renewables / Company Confidential © 2014!

NEC  2008-­‐2014  

Page 12: Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and Rapid Shutdown Requirements

www.solectria.com!

Built for the real world! Solectria Renewables / Company Confidential © 2014!

New/Imminent  Code  Requirements  

NEC  2008  §  No  Arc-­‐Fault  Requirements  §  The  Danger  Zone      NEC  2011  §  Arc-­‐Fault  (690.11)  §  Fuse  Servicing  Disconnects  (690.16)  

NEC  2014  §  Grounded  Conductor  Ground  Fault  (690.5)  §  Rapid  Shutdown  (690.12)    

Page 13: Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and Rapid Shutdown Requirements

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Built for the real world! Solectria Renewables / Company Confidential © 2014!

NEC  2014  Adop)on  

•  NEC  2014  adop:on  varies  state  by  state  •  By  the  end  of  2014,  18  states  plan  to  adopt  NEC  2014  

Page 14: Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and Rapid Shutdown Requirements

www.solectria.com!

Built for the real world! Solectria Renewables / Company Confidential © 2014!

Primary  System  Topologies    

•  Disconnec:ng  string  combiner  with  AFDI  +  3-­‐phase  central  inverter  

•  3-­‐phase  string  inverter  with  AFDI  

+  

Page 15: Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and Rapid Shutdown Requirements

www.solectria.com!

Built for the real world! Solectria Renewables / Company Confidential © 2014!

Rapid  Shutdown  

Page 16: Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and Rapid Shutdown Requirements

www.solectria.com!

Built for the real world! Solectria Renewables / Company Confidential © 2014!

690.12  (C)  Facili)es  with  Rapid  Shutdown  

(1)  Requirements  for  controlled  conductors  shall  apply  only  to  PV  system  conductors  of  more  than  1.5m  (5  .)  in  length  inside  a  building  ,  or  more  than  3m  (10  .)  from  a  PV  array.  

(2)  Controlled  Conductors  shall  be  limited  to  not  more  than  30V  and  240  volt-­‐amperes  within  10  seconds  of  rapid  shutdown  ini:a:on.  

(3)  Voltage  and  power  shall  be  measured  between  any  conductor  and  ground  

(4)   The  rapid  shutdown  ini:a:on  methods  shall  be  labeled  in  accordance  with  690.56(B)  

(5)  Equipment  that  performs  the  rapid  shutdown  shall  be  listed  and  iden:fied.      

•  NEC  690.12  (C)  states:  PV  system  circuits  installed  on  or  in  buildings  shall  include  a  rapid  shutdown  func:on  that  controls  specific  conductors  in  accordance  with  690.12(1)  through  (5)  as  follows:  

Page 17: Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and Rapid Shutdown Requirements

www.solectria.com!

Built for the real world! Solectria Renewables / Company Confidential © 2014!

To  Inverter  

10  foot  boundary  

Rapid  Shutdown  Controlled  Conductors  

Page 18: Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and Rapid Shutdown Requirements

www.solectria.com!

Built for the real world! Solectria Renewables / Company Confidential © 2014!

To  Inverter  

10  foot  boundary   24V  dc  

ON  

ON  

ON  

ON  

Rapid  Shutdown  Controlled  Conductors  

Page 19: Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and Rapid Shutdown Requirements

www.solectria.com!

Built for the real world! Solectria Renewables / Company Confidential © 2014!

To  Inverter  

10  foot  boundary   24V  dc  

OFF  

OFF  

OFF  

OFF  

Rapid  Shutdown  Controlled  Conductors  

Page 20: Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and Rapid Shutdown Requirements

www.solectria.com!

Built for the real world! Solectria Renewables / Company Confidential © 2014!

DC  Bus  Capacitance  

24V  dc  

ON  

ON  

ON  

ON  

AC  Disconnect  

ON  

ON  

DC  Contactors  in  the  inverter  open  when  AC  is  off    

SGI,  SGI  XT,  and  SGI  XTM  all  have  DC  Vacuum  Contactors  

Page 21: Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and Rapid Shutdown Requirements

www.solectria.com!

Built for the real world! Solectria Renewables / Company Confidential © 2014!

24V  dc  

OFF  

OFF  

OFF  

OFF  

AC  Disconnect  

OFF  

OFF  

SGI,  SGI  XT,  and  SGI  XTM  all  have  DC  Vacuum  Contactors  DC  Contactors  in  the  inverter  open  when  AC  is  off    

DC  Bus  Capacitance  

Page 22: Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and Rapid Shutdown Requirements

www.solectria.com!

Built for the real world! Solectria Renewables / Company Confidential © 2014!

DC  Bus  Capacitance  

24V  dc  

ON  

ON  

ON  

ON  

AC  Disconnect  

ON  

ON  DC  Bus  Capacitance  must  discharge  within  10s      PVI  does  this  in  2.5s  

PVI  does  not  have  DC  Vacuum  Contactors  

Page 23: Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and Rapid Shutdown Requirements

www.solectria.com!

Built for the real world! Solectria Renewables / Company Confidential © 2014!

24V  dc  

OFF  

OFF  

OFF  

OFF  

AC  Disconnect  

OFF  

PVI  does  not  have  DC  Vacuum  Contactors  

DC  Bus  Capacitance  

OFF  DC  Bus  Capacitance  must  discharge  within  10s      PVI  does  this  in  2.5s  

Page 24: Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and Rapid Shutdown Requirements

www.solectria.com!

Built for the real world! Solectria Renewables / Company Confidential © 2014!

To  Panelboard  

10  foot  boundary  AC  Disconnect  

ON  

ON  

ON  

ON  

Controlled  Conductors  with  3-­‐Phase  String  Inverters  

Page 25: Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and Rapid Shutdown Requirements

www.solectria.com!

Built for the real world! Solectria Renewables / Company Confidential © 2014!

To  Panelboard  

10  foot  boundary  AC  Disconnect  

OFF  

OFF  

OFF  

OFF  

Controlled  Conductors  with  3-­‐Phase  String  Inverters  

Page 26: Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and Rapid Shutdown Requirements

www.solectria.com!

Built for the real world! Solectria Renewables / Company Confidential © 2014!

ARCCOM  Arc-­‐Fault  Enabled  String  Combiners  •  ARCCOM  

o  8,  12,  16  or  24  Fused  Inputs  

•  Cri:cal  Component  for:    o  Arc  Fault  (690.11)  o  Rapid  Shutdown  (690.12)  o  Fuse  Servicing  Disconnects  (690.16)  

•  Key  Features:  o  600  or  1000  VDC  o  Contactor  disconnect  o  Audible  indica:on  o  LED  indicators  o  Dry  contact  indica:on  o  Lowest  power  consump:on  in  the  industry  

•  Op:ons  o  Stud  connec:ons  for  field-­‐crimped  lugs  o  Surge  arrestor  o  Internal  power  supply  

Page 27: Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and Rapid Shutdown Requirements

www.solectria.com!

Built for the real world! Solectria Renewables / Company Confidential © 2014!

Put  Intersolar  ARCCOM  video  here.  

Page 28: Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and Rapid Shutdown Requirements

www.solectria.com!

Built for the real world! Solectria Renewables / Company Confidential © 2014!

Arc Fault Detection Circuitry!

Optional Type 2 DC SPD!

Optional 120Vac Power Supply!

DC Vacuum Contactor!

Finger Safe Fuse Holders!

DC  Conduit  Entry  Loca)on  

Inside  the  ARCCOM  

Page 29: Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and Rapid Shutdown Requirements

www.solectria.com!

Built for the real world! Solectria Renewables / Company Confidential © 2014!

690.12  (C)  Facili)es  with  Rapid  Shutdown  

(1)  Requirements  for  controlled  conductors  shall  apply  only  to  PV  system  conductors  of  more  than  1.5m  (5  .)  in  length  inside  a  building  ,  or  more  than  3m  (10  .)  from  a  PV  array.  

(2)  Controlled  Conductors  shall  be  limited  to  not  more  than  30V  and  240  volt-­‐amperes  within  10  seconds  of  rapid  shutdown  ini:a:on.  

(3)  Voltage  and  power  shall  be  measured  between  any  conductor  and  ground  

(4)   The  rapid  shutdown  ini:a:on  methods  shall  be  labeled  in  accordance  with  690.56(B)  

(5)  Equipment  that  performs  the  rapid  shutdown  shall  be  listed  and  iden:fied.      

•  NEC  690.12  (C)  states:  PV  system  circuits  installed  on  or  in  buildings  shall  include  a  rapid  shutdown  func:on  that  controls  specific  conductors  in  accordance  with  690.12(1)  through  (5)  as  follows:  

 Achieved  by  Inverter/  ARCCOM  placement  

 Achieved  by  Inverter  Shutdown  or  DC  Contactors  in  the  ARCCOM  

 TL  Inverters  and  ARCCOM  are  listed  

 Provide  a  placard  with  the  prescribed  phrasing  

 No  shor:ng  out  or  free-­‐floa:ng  the  array  to  achieve  30V  

Page 30: Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and Rapid Shutdown Requirements

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(C)  Facili)es  with  Rapid  Shutdown  Buildings  or  structures  with  both  u:lity  service  and  a  PV  system  complying  with  690.12  shall  have  a  permanent  plaque  or  directory  including  the  following  wording:            PHOTOVOLTAIC    SYSTEM    EQUIPPED    WITH  RAPID    SHUTDOWN              The  plaque  or  directory  shall  be  reflec:ve,  with  lemers  capitalized  and  having  a  minimum  height  of  9.5mm  (3/8  in.),  in  white  on  red  background.  

Where  do  you  put  this?  

690.56  Iden)fica)on  of  Power  Sources  

Page 31: Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and Rapid Shutdown Requirements

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Arc-­‐Fault  Detec)on  

Page 32: Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and Rapid Shutdown Requirements

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What  is  an  arc-­‐fault?  

Current  

Current  

•  The  same  amount  of  current  must  flow  through  a  smaller  conductor  •  Conductor  heats  up  and  eventually  melts  

•  Healthy  Wire  

Current  

•  Air  Ionizes  and  plasma  allows  current  to  flow  across  the  gap  •  Temperatures  can  reach  9000  degrees  Fahrenheit  

Page 33: Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and Rapid Shutdown Requirements

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Built for the real world! Solectria Renewables / Company Confidential © 2014!

Page 34: Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and Rapid Shutdown Requirements

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Built for the real world! Solectria Renewables / Company Confidential © 2014!

690.11  ARC-­‐Fault  Circuit  Protec)on  (Direct  Current)  

(1)  The  system  shall  detect  and  interrupt  arcing  faults  resul:ng  from  a  failure  in  the  intended  con:nuity  of  a  conductor,  connec:on,  module,  or  other  system  component  in  the  dc  PV  source  and  dc  PV  output  circuits.  

(2)  The  system  shall  require  that  the  disabled  or  disconnected  equipment  be  manually  restarted.  

(3)  The  system  shall  have  an  annunciator  that  provides  a  visual  indica:on  that  the  circuit  interrupter  has  operated.  This  indica:on  shall  not  reset  automa:cally.    

 

•  Photovoltaic  Systems  with  dc  source  circuits,  dc  output  circuits,  or  both,  opera:ng  at  a  PV  system  maximum  system  voltage  of  80  volts  or  greater,  shall  be  protected  by  a  listed  (dc)  arc-­‐fault  circuit  interrupter,  PV  type,  or  other  system  components  listed  to  provide  equivalent  protec:on.  The  PV  arc-­‐fault  protec:on  means  shall  comply  with  the  following  requirements:  

Page 35: Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and Rapid Shutdown Requirements

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Built for the real world! Solectria Renewables / Company Confidential © 2014!

Arc-Fault Detection!

§  Detec:on  based  on  telltale  frequency  characteris:cs  

§  Inverters  generate  noise  in  the  same  range  

§  UL  1699B    

Source- Implementing Arc Detection in Solar Applications Brett Novak, Texas Instruments

Page 36: Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and Rapid Shutdown Requirements

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•  NEC  690.11  requires  manual  reset  

•  Every  arc-­‐fault  trip  requires  a  truck  roll  

•  ARCCOM  has  undergone  1  year  of  product  compa:bility  tes:ng  to  minimize  nuisance  tripping.  

•  Single  sensor,  reflec:on  based  technology  is  significantly  more  prone  to  nuisance  tripping  and  more  costly  to  maintain  

 

String Level Detection!

Maximize  SNR  to  Minimize  Nuisance  Tripping  

Page 37: Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and Rapid Shutdown Requirements

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What  does  this  mean  for  the  end  user?  

•  String  level  detec:on  board  iden:fies  problem  string  down  to  1  of  4  possible  strings  with  a  LED  indicator  light  

•  Provides  faster  troubleshoo:ng  of  system  a.er  a  fault  

•  Simplified  isola:on  of  damaged  por:on  of  array  

•  Faster  recovery  :me  >  increased  overall  produc:on  while  repairs  take  place  

Page 38: Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and Rapid Shutdown Requirements

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690.11  ARC-­‐Fault  Circuit  Protec)on  (Direct  Current)  

(1)  The  system  shall  detect  and  interrupt  arcing  faults  resul:ng  from  a  failure  in  the  intended  con:nuity  of  a  conductor,  connec:on,  module,  or  other  system  component  in  the  dc  PV  source  and  dc  PV  output  circuits.  

(2)  The  system  shall  require  that  the  disabled  or  disconnected  equipment  be  manually  restarted.  

(3)  The  system  shall  have  an  annunciator  that  provides  a  visual  indica:on  that  the  circuit  interrupter  has  operated.  This  indica:on  shall  not  reset  automa:cally.    

 

•  Photovoltaic  Systems  with  dc  source  circuits,  dc  output  circuits,  or  both,  opera:ng  at  a  PV  system  maximum  system  voltage  of  80  volts  or  greater,  shall  be  protected  by  a  listed  (dc)  arc-­‐fault  circuit  interrupter,  PV  type,  or  other  system  components  listed  to  provide  equivalent  protec:on.  The  PV  arc-­‐fault  protec:on  means  shall  comply  with  the  following  requirements:  

 ARCCOM  is  listed  to  UL1699B  

 ARCCOM  must  be  manually  restarted  

 ARCCOM  includes  audible  buzzer,  LEDs,  and  auxilary  contact  

Page 39: Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and Rapid Shutdown Requirements

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System  Design  Considera)ons  for  ARCCOM  

•  The  ARCCOM  only  requires  power  to  operate  and  has  no  communica:on  with  the  inverters  at  all.    •  24Vdc  power  can  come  from  an  external  power  supply  or  from  op:onal  100V-­‐277V  to  24V  power  supply.  (most  common  approach)  •  120VAC  can  have  significant  voltage  drop  (20V  from  nominal)  before  op:onal  power  supply  will  not  work.  Greater  design  flexibility.  •  277VAC  can  drop  all  the  way  to  100VAC  and  s:ll  work!  Smaller  conductors  necessary  to  power  ARCCOM  •  Rapid  shutdown  disconnect  placement  should  be  coordinated  with  first  responders.    Best  to  avoid  another  Dietz  &  Watson    •  Sub  array  level  monitoring  will  remotely  alert  you  through  alarms  in  the  event  of  an  arc  fault  condi:on.      

     

Page 40: Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and Rapid Shutdown Requirements

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Built for the real world! Solectria Renewables / Company Confidential © 2014!

Kathie Zipp Solar Power World

[email protected] Twitter: @SolarKathieZ

Claude Colp Solectria Renewables

[email protected] Twitter: @SolectriaRen

Questions?

Page 41: Commercial Solar Design & NEC 2014: Meeting New Arc Fault Detection and Rapid Shutdown Requirements

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Built for the real world! Solectria Renewables / Company Confidential © 2014!

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