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New Mexico State University
College of Engineering 
Klipsch School of Electrical and Computer Engineering

Codes & Standards

Martin Gomez
The 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."

HPCover


Code Corner Articles
PV Changes in the 2011 NEC - Home Power Magazine #142 April/May 2011
Conductor Sizing & Overcurrent Device Ratings - Home Power Magazine #141 February/March 2011
Utility Interconnections & the NEC  - Home Power Magazine #140 December 2010/January 2011
Ungrounded PV Systems - Home Power Magazine #139 October/November 2010
Common Questions about Grid-Tied Systems - Home Power Magazine #138 August/September 2010
Grounding & UL Standard 1703 - Home Power Magazine #137 June/July 2010
Microinverters & AC PV Modules - Home Power Magazine #136 April/May 2010
Inverter: Supply-Side Connections - Home Power Magazine #135 February/March 2010
Connecting Inverters to The Grid Part 1 Load-Side Connections - Home Power Magazine #134 December 2009/January 2010
Inverter Grounding - Home Power Magazine #133 October/November 2009
Inverter Ins & Outs - Home Power Magazine #132 August/September 2009
Array to Inverter and Things Between - Home Power Magazine #131 June/July 2009
Combiners to DC Disconnects - Home Power Magazine #130 April/May 2009
Code Calculations for PV Modules - Home Power Magazine #129 February/March 2009
Roof-Mounted: PV System Design Challenges - Home Power Magazine #128 December 2008/January 2009
New Grounding Methods: NEC Compliant or Not? - Home Power Magazine #127 October/November 2008
Changing Codes & Grid Connections - Home Power Magazine #126 August/September 2008
To Fuse or Not to Fuse? - Home Power Magazine #125 June/July 2008
Avoiding Common Code Mistakes - Home Power Magazine #124 April/May 2008
Ground-Fault Protection is Expanding - Home Power Magazine #123 February/March 2008
Module Wiring 101 - Home Power Magazine #122 December 2007/January 2008
Code Q&A - Home Power Magazine #121 October/November 2007
Code Changes through the Years - Home Power Magazine #120 August/September 2007
Disco Madness: The Whys and Wheres of Disconnects - Home Power Magazine #119 June/July 2007
Revising Standards & Codes - Home Power Magazine #118 April/May 2007
PV Odds & Ends - Home Power Magazine #117 February/March 2007
Beauty is in the Eye of the Inspector - Home Power Magazine #116 December 2006/January 2007
Considerations for PV Site Surveys - Home Power Magazine #115 October/November 2006
Code Q&A - Home Power Magazine #114 August/September 2006
Working with Inspectors: What Your Checklist Should Include - Home Power Magazine #113 June/July 2006
Making the Utility Connection for Larger Systems - Home Power Magazine #112 April/May 2006
Making the Utility Connection - Home Power Magazine #111 February/March 2006
Code Questions and Answers - Home Power Magazine #110 December 2005/January 2006
The 2008 National Electrcial Code, Part 2 - Home Power Magazine #109 October/November 2005
The 2008 NEC: Changes to the National Electrical Code - Home Power Magazine #108 August/September 2005
Selecting Cables for PV Systems - Home Power Magazine #107 June/July 2005
Checklist for Designing and Installing a PV System - Home Power Magazine #106 April/May 2005
PV Systems and the 2005 National Electrical Code - Home Power Magazine #105 February/March 2005
Flexible Cables & Proper Termination - Home Power Magazine #104 December 2004/January 2005
PV Array Grounding (Continued) - Home Power Magazine #103 October/November 2004
PV Array Grounding - Home Power Magazine #102 August/September 2004
PV Basics Affect the Code - Home Power Magazine #101 June/July 2004
The National Electrical Code—Past, Present, and Future - Home Power Magazine #100 February/March 2004
Common Mistakes and How to Avoid Them - Home Power Magazine #99 December2003/January 2004
Old World Charm with Modern Convenience - Home Power Magazine #98 October/November 2003
Making Connections - Home Power Magazine #96, August/September 2003
Code Calculations for an Off-Grid PV System - Home Power Magazine #95 June/July 2003
Planning a Code-Compliant, Off-Grid PV System - Home Power Magazine #94 April/May 2003
Resources - Home Power Magazine #92, December 2002/January 2003
The Front End - Home Power Magazine #91 October/November 2002
More Details on Making the Grid Connection-Grounding, Backfed Breakers & PV Disconnect - Home Power Magazine #90 August/September 2002
Making the Grid Connection - Home Power Magazine #89 June/July 2002
Doing the Best We Can - Home Power Magazine #88 April/May 2002
2002 NEC & Beyond - Home Power Magazine #87 February/March 2002
2002 NEC - Home Power Magazine #86 December 2001/January 2002
Ogling Overcurrent Devices - Home Power Magazine #85 October/November 2001
Overcurrent Devices - Home Power Magazine #84 August/September 2001
More Module Wiring - Home Power Magazine #83 June/July 2001
Buying Safe Cables - Home Power Magazine #82 April/May 2001
Module Wiring Example - Home Power Magazine #81 February/March 2001
Voltage Drop after NEC Requirements - Home Power Magazine #80 December 2000/January 2001
PV Modules, Conductors & the Code - Home Power Magazine #79 October/November 2000
How Big? - Home Power Magazine #78 August/September 2000
Where To Use Which Conductor - Home 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 Code - Home Power Magazine #75 February/March 2000
Grounding The South Forty - Home Power Magazine #74 December 1999/January 2000
PV Grounding on a Single Dwelling - Home Power Magazine #73 October/November 1999
To Ground or Not to Ground: That is Not the Question - Home Power Magazine #72 August/September 1999
Code Summary, Checklist, & Manual - Home Power Magazine #71 June/July 1999
Perspectives on the National Electrical Code - Home Power Magazine #70 April/May 1999
PV and the 1999 National Electrical Code - Home Power Magazine #69 February/March 1999
Surfing Through Breakers - Home Power Magazine #68 December 1998/January 1999
Focusing on Fuses - Home Power Magazine #67 October/November 1998
Clarifying Confusing Cables - Home Power Magazine #66 August/September 1998
Grounding Separate Structures - Home Power Magazine #65 June/July 1998
Grounding - Home Power Magazine #64 April/May 1998
Code Writing Processes and Series Diodes - Home Power Magazine #63 February/March 1998
Minutia - Home Power Magazine #62 December 1997/January 1998
Questions Questions - Home Power Magazine #61 October/November 1997
Flex is Out and the Dodo Diode Isn't Dead - Home 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 Checklists - Home Power Magazine #58 April/May 1997
FLASH - KABOOM! - Home Power Magazine #57 February/March 1997
Listing PV Equipment - Home Power Magazine #56 December 1996/January 1997
Codes and Standards: Cost and Performance Impacts - Home Power Magazine #55 October/November 1996
Safety Alert - Home Power Magazine #54 August/September 1996
Disasters Happen - Home Power Magazine #52 April/May 1996
The National Electrical Code® & PV Modules Wiring Methods & Cables - Home Power Magazine #51 February/March 1996
Designing PV Systems to Meet the National Electrical Code - Home Power Magazine #50, December 1995/January 1996