Code Corner articles


HPcoverThe articles cover the requirements of the 1990, 1993, 1996, and 1999 editions of the National Electrical Code.  This material represents the best available information at the time of publication (starting as early as 1990).  It should only be used with a full understanding of the NEC which is available from local electrical supply houses and the National Fire Protection Association.   Better information on good engineering practices and good workmanship appears in the later Code Corner articles.

“These articles are based on the edition of the National Electrical Code (NEC) in affect at the time they were written. Code requirements change, interpretations of the Code change, and common practices change. The information in the archives will be of limited usefulness and may no longer be correct.”

Article NameMagazine Edition
PV Changes in the 2011 NECHome Power Magazine #142 April/May 2011
Conductor Sizing & Overcurrent Device RatingsHome Power Magazine #141 February/March 2011
Utility Interconnections & the NEC Home Power Magazine #140 December 2010/January 2011
Ungrounded PV SystemsHome Power Magazine #139 October/November 2010
Common Questions about Grid-Tied SystemsHome Power Magazine #138 August/September 2010
Grounding & UL Standard 1703Home Power Magazine #137 June/July 2010
Microinverters & AC PV ModulesHome Power Magazine #136 April/May 2010
Inverter: Supply-Side ConnectionsHome Power Magazine #135 February/March 2010
Connecting Inverters to The Grid Part 1 Load-Side ConnectionsHome Power Magazine #134 December 2009/January 2010
Inverter GroundingHome Power Magazine #133 October/November 2009
Inverter Ins & OutsHome Power Magazine #132 August/September 2009
Array to Inverter and Things BetweenHome Power Magazine #131 June/July 2009
Combiners to DC DisconnectsHome Power Magazine #130 April/May 2009
Code Calculations for PV ModulesHome Power Magazine #129 February/March 2009
Roof-Mounted: PV System Design ChallengesHome Power Magazine #128 December 2008/January 2009
New Grounding Methods: NEC Compliant or Not?Home Power Magazine #127 October/November 2008
Changing Codes & Grid ConnectionsHome Power Magazine #126 August/September 2008
To Fuse or Not to Fuse?Home Power Magazine #125 June/July 2008
Avoiding Common Code MistakesHome Power Magazine #124 April/May 2008
Ground-Fault Protection is ExpandingHome Power Magazine #123 February/March 2008
Module Wiring 101Home Power Magazine #122 December 2007/January 2008
Code Q&AHome Power Magazine #121 October/November 2007
Code Changes through the YearsHome Power Magazine #120 August/September 2007
Disco Madness: The Whys and Wheres of DisconnectsHome Power Magazine #119 June/July 2007
Revising Standards & CodesHome Power Magazine #118 April/May 2007
PV Odds & EndsHome Power Magazine #117 February/March 2007
Beauty is in the Eye of the InspectorHome Power Magazine #116 December 2006/January 2007
Considerations for PV Site SurveysHome Power Magazine #115 October/November 2006
Code Q&AHome Power Magazine #114 August/September 2006
Working with Inspectors: What Your Checklist Should IncludeHome Power Magazine #113 June/July 2006
Making the Utility Connection for Larger SystemsHome Power Magazine #112 April/May 2006
Making the Utility ConnectionHome Power Magazine #111 February/March 2006
Code Questions and AnswersHome Power Magazine #110 December 2005/January 2006
The 2008 National Electrcial Code, Part 2Home Power Magazine #109 October/November 2005
The 2008 NEC: Changes to the National Electrical CodeHome Power Magazine #108 August/September 2005
Selecting Cables for PV SystemsHome Power Magazine #107 June/July 2005
Checklist for Designing and Installing a PV SystemHome Power Magazine #106 April/May 2005
PV Systems and the 2005 National Electrical CodeHome Power Magazine #105 February/March 2005
Flexible Cables & Proper TerminationHome Power Magazine #104 December 2004/January 2005
PV Array Grounding (Continued)Home Power Magazine #103 October/November 2004
PV Array GroundingHome Power Magazine #102 August/September 2004
PV Basics Affect the CodeHome Power Magazine #101 June/July 2004
The National Electrical Code—Past, Present, and FutureHome Power Magazine #100 February/March 2004
Common Mistakes and How to Avoid ThemHome Power Magazine #99 December2003/January 2004
Old World Charm with Modern ConvenienceHome Power Magazine #98 October/November 2003
Making ConnectionsHome Power Magazine #96, August/September 2003
Code Calculations for an Off-Grid PV SystemHome Power Magazine #95 June/July 2003
Planning a Code-Compliant, Off-Grid PV SystemHome Power Magazine #94 April/May 2003
ResourcesHome Power Magazine #92, December 2002/January 2003
The Front EndHome Power Magazine #91 October/November 2002
More Details on Making the Grid Connection-Grounding, Backfed Breakers & PV DisconnectHome Power Magazine #90 August/September 2002
Making the Grid ConnectionHome Power Magazine #89 June/July 2002
Doing the Best We CanHome Power Magazine #88 April/May 2002
2002 NEC & BeyondHome Power Magazine #87 February/March 2002
2002 NECHome Power Magazine #86 December 2001/January 2002
Ogling Overcurrent DevicesHome Power Magazine #85 October/November 2001
Overcurrent DevicesHome Power Magazine #84 August/September 2001
More Module WiringHome Power Magazine #83 June/July 2001
Buying Safe CablesHome Power Magazine #82 April/May 2001
Module Wiring ExampleHome Power Magazine #81 February/March 2001
Voltage Drop after NEC RequirementsHome Power Magazine #80 December 2000/January 2001
PV Modules, Conductors & the CodeHome Power Magazine #79 October/November 2000
How Big?Home Power Magazine #78 August/September 2000
Where To Use Which ConductorHome Power Magazine #77 June/July 2000
AWG, RHW, CNN, USE-2, THHN, THW, XLPE, #@%*&!Home Power Magazine #76 April/May 2000
Road To The 2002 CodeHome Power Magazine #75 February/March 2000
Grounding The South FortyHome Power Magazine #74 December 1999/January 2000
PV Grounding on a Single DwellingHome Power Magazine #73 October/November 1999
To Ground or Not to Ground: That is Not the QuestionHome Power Magazine #72 August/September 1999
Code Summary, Checklist, & ManualHome Power Magazine #71 June/July 1999
Perspectives on the National Electrical CodeHome Power Magazine #70 April/May 1999
PV and the 1999 National Electrical CodeHome Power Magazine #69 February/March 1999
Surfing Through BreakersHome Power Magazine #68 December 1998/January 1999
Focusing on FusesHome Power Magazine #67 October/November 1998
Clarifying Confusing CablesHome Power Magazine #66 August/September 1998
Grounding Separate StructuresHome Power Magazine #65 June/July 1998
GroundingHome Power Magazine #64 April/May 1998
Code Writing Processes and Series DiodesHome Power Magazine #63 February/March 1998
MinutiaHome Power Magazine #62 December 1997/January 1998
Questions QuestionsHome Power Magazine #61 October/November 1997
Flex is Out and the Dodo Diode Isn't DeadHome Power Magazine #60 August/September 1997
If It Happened To Me, It Can Happen To You!Home Power Magazine #59 June/July 1997
Ground Fault Protection and PV ChecklistsHome Power Magazine #58 April/May 1997
FLASH -KABOOM!Home Power Magazine #57 February/March 1997
Listing PV EquipmentHome Power Magazine #56 December 1996/January 1997
Codes and Standards: Cost and Performance ImpactsHome Power Magazine #55 October/November 1996
Safety AlertHome Power Magazine #54 August/September 1996
Disasters HappenHome Power Magazine #52 April/May 1996
The National Electrical Code® & PV Modules Wiring Methods & CablesHome Power Magazine #51 February/March 1996
Designing PV Systems to Meet the National Electrical CodeHome Power Magazine #50, December 1995/January 1996
The 1996 National Electrical Code and Cable UpdatesHome Power Magazine #49, October / November 1995
Example Systems Stand-Alone Hybrid SystemHome Power Magazine #48, August / September 1995
Example Systems Stand-Alone and Grid-Tied SystemsHome Power Magazine #47, June / July 1995
Example Systems Small Stand-Alone SystemsHome Power Magazine #46, April / May 1995
Example Systems: Water PumpingHome Power Magazine #45, February / March 1995
The Good, The Bad, and The UglyHome Power Magazine #44, December 1994 / January 1995
NEC and UL Requirements Too Conservative?Home Power Magazine #43, October / November 1994
The 1993 National Electrical Code and The InspectorHome Power Magazine #33, February / March 1993
Conductors and The CodeHome Power Magazine #31, October / November 1992
The Code and Balance of Systems EquipmentHome Power Magazine #25, October / November 1991
The National Electric Code and YouHome Power Magazine #23, June / July 1991
Power to the People- Load CircuitsHome Power Magazine #22, April / May 1991
MEET THE CODE, MAXIMIZE PERFORMANCE, AND KEEP COSTS DOWNHome Power Magazine #21, February / March 1991
IS PV GOING TO GROW UP?Home Power Magazine #20, December 1990 / January 1991
TO CONNECT OR NOT CONNECT -- THAT IS THE QUESTIONHome Power Magazine #19, October/November 1990
THE SHOCKING STORY OF GROUNDINGHome Power Magazine #18, August/September 1990
PV that Meets the National Electric CodeHome Power Magazine #16, April/May 1990
SWRES ResearchHome Power Magazine #13, October/November 1989