National Electrical Installation Standards

Standards as High as Your Own

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Wednesday, August 22, 2018

Question:

Re: CQD answer published Monday, August 13, 2018-Grounded Conductor Terminations 2

Grounded vs. grounding conductors..........

When is the NEC going to be written so it can be understood?  408.21 is a good example of how not to write the code.  The attachment from Siemens recognized the problem and reverted to "neutral" and "ground" to explain the requirement.

https://w3.usa.siemens.com/us/internet-dms/btlv/Residential/Residential-Murray/docs/Grounded_Conductor_Terminations.pdf

Dave

A

Answer:

Hey Dave thanks for your comment and for sharing the document with additional explanations based on the 2002 NEC. The section is now 408.41 in the 2017 NEC. The terms Neutral Conductor and Neutral Point were added in the 2008 NEC. A neutral conductor is connected to a system neutral point and is intended to carry current during normal conditions. Grounded Conductors are circuit or system conductors - that are intentionally grounded. Many neutral conductors are also grounded conductors but a grounded conductor supplied from a two wire system is not a neutral conductor. The NEC is often written in a manner that can cover various types of installations while still being technically correct. When white colored insulated conductors are called neutrals in the field, usually that is true but not always. If you have thoughts about revising the NEC wording so it is more understandable submit a Public Input or Public Comment to do that - it might help all of us.

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